/*
* Copyright 2010-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package com.amazonaws.services.s3.transfer;
import static com.amazonaws.services.s3.internal.ServiceUtils.APPEND_MODE;
import static com.amazonaws.services.s3.internal.ServiceUtils.OVERWRITE_MODE;
import java.io.File;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import java.util.Stack;
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.amazonaws.AbortedException;
import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.AmazonWebServiceRequest;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
import com.amazonaws.event.ProgressEvent;
import com.amazonaws.event.ProgressEventFilter;
import com.amazonaws.event.ProgressEventType;
import com.amazonaws.event.ProgressListener;
import com.amazonaws.event.ProgressListenerChain;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.AmazonS3Encryption;
import com.amazonaws.services.s3.internal.Mimetypes;
import com.amazonaws.services.s3.internal.ServiceUtils;
import com.amazonaws.services.s3.model.AbortMultipartUploadRequest;
import com.amazonaws.services.s3.model.CopyObjectRequest;
import com.amazonaws.services.s3.model.GetObjectMetadataRequest;
import com.amazonaws.services.s3.model.GetObjectRequest;
import com.amazonaws.services.s3.model.ListMultipartUploadsRequest;
import com.amazonaws.services.s3.model.ListObjectsRequest;
import com.amazonaws.services.s3.model.MultipartUpload;
import com.amazonaws.services.s3.model.MultipartUploadListing;
import com.amazonaws.services.s3.model.ObjectListing;
import com.amazonaws.services.s3.model.ObjectMetadata;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.model.S3Object;
import com.amazonaws.services.s3.model.S3ObjectSummary;
import com.amazonaws.services.s3.transfer.Transfer.TransferState;
import com.amazonaws.services.s3.transfer.internal.CopyCallable;
import com.amazonaws.services.s3.transfer.internal.CopyImpl;
import com.amazonaws.services.s3.transfer.internal.CopyMonitor;
import com.amazonaws.services.s3.transfer.internal.DownloadImpl;
import com.amazonaws.services.s3.transfer.internal.DownloadMonitor;
import com.amazonaws.services.s3.transfer.internal.MultipleFileDownloadImpl;
import com.amazonaws.services.s3.transfer.internal.MultipleFileTransferMonitor;
import com.amazonaws.services.s3.transfer.internal.MultipleFileUploadImpl;
import com.amazonaws.services.s3.transfer.internal.S3ProgressListener;
import com.amazonaws.services.s3.transfer.internal.S3ProgressListenerChain;
import com.amazonaws.services.s3.transfer.internal.TransferManagerUtils;
import com.amazonaws.services.s3.transfer.internal.TransferProgressUpdatingListener;
import com.amazonaws.services.s3.transfer.internal.TransferStateChangeListener;
import com.amazonaws.services.s3.transfer.internal.UploadCallable;
import com.amazonaws.services.s3.transfer.internal.UploadImpl;
import com.amazonaws.services.s3.transfer.internal.UploadMonitor;
import com.amazonaws.util.VersionInfoUtils;
/**
* High level utility for managing transfers to Amazon S3.
* <p>
* <code>TransferManager</code> provides a simple API for uploading content to
* Amazon S3, and makes extensive use of Amazon S3 multipart uploads to achieve
* enhanced throughput, performance and reliability.
* <p>
* When possible, <code>TransferManager</code> attempts to use multiple threads
* to upload multiple parts of a single upload at once. When dealing with large
* content sizes and high bandwidth, this can have a significant increase on
* throughput.
* <p>
* <code>TransferManager</code> is responsible for managing resources such as
* connections and threads; share a single instance of
* <code>TransferManager</code> whenever possible. <code>TransferManager</code>,
* like all the client classes in the AWS SDK for Java, is thread safe. Call
* <code> TransferManager.shutdownNow()</code> to release the resources once the
* transfer is complete.
* <p>
* Using <code>TransferManager</code> to upload options to Amazon S3 is easy:
*
* <pre class="brush: java">
* DefaultAWSCredentialsProviderChain credentialProviderChain = new DefaultAWSCredentialsProviderChain();
* TransferManager tx = new TransferManager(
* credentialProviderChain.getCredentials());
* Upload myUpload = tx.upload(myBucket, myFile.getName(), myFile);
*
* // You can poll your transfer's status to check its progress
* if (myUpload.isDone() == false) {
* System.out.println("Transfer: " + myUpload.getDescription());
* System.out.println(" - State: " + myUpload.getState());
* System.out.println(" - Progress: "
* + myUpload.getProgress().getBytesTransferred());
* }
*
* // Transfers also allow you to set a <code>ProgressListener</code> to receive
* // asynchronous notifications about your transfer's progress.
* myUpload.addProgressListener(myProgressListener);
*
* // Or you can block the current thread and wait for your transfer to
* // to complete. If the transfer fails, this method will throw an
* // AmazonClientException or AmazonServiceException detailing the reason.
* myUpload.waitForCompletion();
*
* // After the upload is complete, call shutdownNow to release the resources.
* tx.shutdownNow();
* </pre>
* <p>
* Transfers can be paused and resumed at a later time. It can also survive JVM
* crash, provided the information that is required to resume the transfer is
* given as input to the resume operation. For more information on pause and resume,
* @see Upload#pause()
* @see Download#pause()
* @see TransferManager#resumeUpload(PersistableUpload)
* @see TransferManager#resumeDownload(PersistableDownload)
*/
public class TransferManager {
/** The low level client we use to make the actual calls to Amazon S3. */
private final AmazonS3 s3;
/** Configuration for how TransferManager processes requests. */
private TransferManagerConfiguration configuration;
/** The thread pool in which transfers are uploaded or downloaded. */
private final ExecutorService threadPool;
/** Thread used for periodicially checking transfers and updating thier state. */
private final ScheduledExecutorService timedThreadPool = new ScheduledThreadPoolExecutor(1, daemonThreadFactory);
private static final Log log = LogFactory.getLog(TransferManager.class);
/**
* Constructs a new <code>TransferManager</code> and Amazon S3 client using
* the credentials from <code>DefaultAWSCredentialsProviderChain</code>
* <p>
* <code>TransferManager</code> and client objects may pool connections and
* threads. Reuse <code>TransferManager</code> and client objects and share
* them throughout applications.
* <p>
* TransferManager and all AWS client objects are thread safe.
*/
public TransferManager(){
this(new AmazonS3Client(new DefaultAWSCredentialsProviderChain()));
}
/**
* Constructs a new <code>TransferManager</code> and Amazon S3 client using
* the specified AWS security credentials provider.
* <p>
* <code>TransferManager</code> and client objects may pool connections and
* threads. Reuse <code>TransferManager</code> and client objects and share
* them throughout applications.
* <p>
* TransferManager and all AWS client objects are thread safe.
*
* @param credentialsProvider
* The AWS security credentials provider to use when making
* authenticated requests.
*/
public TransferManager(AWSCredentialsProvider credentialsProvider) {
this(new AmazonS3Client(credentialsProvider));
}
/**
* Constructs a new <code>TransferManager</code> and Amazon S3 client using
* the specified AWS security credentials.
* <p>
* <code>TransferManager</code> and client objects
* may pool connections and threads.
* Reuse <code>TransferManager</code> and client objects
* and share them throughout applications.
* <p>
* TransferManager and all AWS client objects are thread safe.
*
* @param credentials
* The AWS security credentials to use when making authenticated
* requests.
*/
public TransferManager(AWSCredentials credentials) {
this(new AmazonS3Client(credentials));
}
/**
* Constructs a new <code>TransferManager</code>,
* specifying the client to use when making
* requests to Amazon S3.
* <p>
* <code>TransferManager</code> and client objects
* may pool connections and threads.
* Reuse <code>TransferManager</code> and client objects
* and share them throughout applications.
* <p>
* TransferManager and all AWS client objects are thread safe.
* </p>
*
* @param s3
* The client to use when making requests to Amazon S3.
*/
public TransferManager(AmazonS3 s3) {
this(s3, TransferManagerUtils.createDefaultExecutorService());
}
/**
* Constructs a new <code>TransferManager</code>
* specifying the client and thread pool to use when making
* requests to Amazon S3.
* <p>
* <code>TransferManager</code> and client objects
* may pool connections and threads.
* Reuse <code>TransferManager</code> and client objects
* and share them throughout applications.
* <p>
* TransferManager and all AWS client objects are thread safe.
*
* @param s3
* The client to use when making requests to Amazon S3.
* @param threadPool
* The thread pool in which to execute requests.
*/
public TransferManager(AmazonS3 s3, ExecutorService threadPool) {
this.s3 = s3;
this.threadPool = threadPool;
this.configuration = new TransferManagerConfiguration();
}
/**
* Sets the configuration which specifies how
* this <code>TransferManager</code> processes requests.
*
* @param configuration
* The new configuration specifying how
* this <code>TransferManager</code>
* processes requests.
*/
public void setConfiguration(TransferManagerConfiguration configuration) {
this.configuration = configuration;
}
/**
* Returns the configuration which specifies how
* this <code>TransferManager</code> processes requests.
*
* @return The configuration settings for this <code>TransferManager</code>.
*/
public TransferManagerConfiguration getConfiguration() {
return configuration;
}
/**
* Returns the underlying Amazon S3 client used to make requests to
* Amazon S3.
*
* @return The underlying Amazon S3 client used to make requests to
* Amazon S3.
*/
public AmazonS3 getAmazonS3Client() {
return s3;
}
/**
* <p>
* Schedules a new transfer to upload data to Amazon S3. This method is
* non-blocking and returns immediately (i.e. before the upload has
* finished).
* </p>
* <p>
* When uploading options from a stream, callers <b>must</b> supply the size of
* options in the stream through the content length field in the
* <code>ObjectMetadata</code> parameter.
* If no content length is specified for the input
* stream, then TransferManager will attempt to buffer all the stream
* contents in memory and upload the options as a traditional, single part
* upload. Because the entire stream contents must be buffered in memory,
* this can be very expensive, and should be avoided whenever possible.
* </p>
* <p>
* Use the returned <code>Upload</code> object to query the progress of the
* transfer, add listeners for progress events, and wait for the upload to
* complete.
* </p>
* <p>
* If resources are available, the upload will begin immediately.
* Otherwise, the upload is scheduled and started as soon as
* resources become available.
* </p>
*
* @param bucketName
* The name of the bucket to upload the new object to.
* @param key
* The key in the specified bucket by which to store the new
* object.
* @param input
* The input stream containing the options to upload to Amazon S3.
* @param objectMetadata
* Additional information about the object being uploaded,
* including the size of the options, content type, additional
* custom user metadata, etc.
*
* @return A new <code>Upload</code> object to use to check
* the state of the upload, listen for progress notifications,
* and otherwise manage the upload.
*
* @throws AmazonClientException
* If any errors are encountered in the client while making the
* request or handling the response.
* @throws AmazonServiceException
* If any errors occurred in Amazon S3 while processing the
* request.
*/
public Upload upload(final String bucketName, final String key, final InputStream input, ObjectMetadata objectMetadata)
throws AmazonServiceException, AmazonClientException {
return upload(new PutObjectRequest(bucketName, key, input, objectMetadata));
}
/**
* Schedules a new transfer to upload data to Amazon S3. This method is
* non-blocking and returns immediately (i.e. before the upload has
* finished).
* <p>
* The returned Upload object allows you to query the progress of the
* transfer, add listeners for progress events, and wait for the upload to
* complete.
* <p>
* If resources are available, the upload will begin immediately, otherwise
* it will be scheduled and started as soon as resources become available.
*
* @param bucketName
* The name of the bucket to upload the new object to.
* @param key
* The key in the specified bucket by which to store the new
* object.
* @param file
* The file to upload.
*
* @return A new Upload object which can be used to check state of the
* upload, listen for progress notifications, and otherwise manage
* the upload.
*
* @throws AmazonClientException
* If any errors are encountered in the client while making the
* request or handling the response.
* @throws AmazonServiceException
* If any errors occurred in Amazon S3 while processing the
* request.
*/
public Upload upload(final String bucketName, final String key, final File file)
throws AmazonServiceException, AmazonClientException {
return upload(new PutObjectRequest(bucketName, key, file));
}
/**
* <p>
* Schedules a new transfer to upload data to Amazon S3. This method is
* non-blocking and returns immediately (i.e. before the upload has
* finished).
* </p>
* <p>
* Use the returned <code>Upload</code> object to query the progress of the
* transfer, add listeners for progress events, and wait for the upload to
* complete.
* </p>
* <p>
* If resources are available, the upload will begin immediately.
* Otherwise, the upload is scheduled and started as soon as
* resources become available.
* </p>
*
* @param putObjectRequest
* The request containing all the parameters for the upload.
*
* @return A new <code>Upload</code> object to use to check
* the state of the upload, listen for progress notifications,
* and otherwise manage the upload.
*
* @throws AmazonClientException
* If any errors are encountered in the client while making the
* request or handling the response.
* @throws AmazonServiceException
* If any errors occurred in Amazon S3 while processing the
* request.
*/
public Upload upload(final PutObjectRequest putObjectRequest)
throws AmazonServiceException, AmazonClientException {
return doUpload(putObjectRequest, null, null, null);
}
/**
* <p>
* Schedules a new transfer to upload data to Amazon S3. This method is
* non-blocking and returns immediately (i.e. before the upload has
* finished).
* </p>
* <p>
* Use the returned <code>Upload</code> object to query the progress of the
* transfer, add listeners for progress events, and wait for the upload to
* complete.
* </p>
* <p>
* If resources are available, the upload will begin immediately. Otherwise,
* the upload is scheduled and started as soon as resources become
* available.
* </p>
*
* @param putObjectRequest
* The request containing all the parameters for the upload.
* @param progressListener
* An optional callback listener to receive the progress of the
* upload.
*
* @return A new <code>Upload</code> object to use to check the state of the
* upload, listen for progress notifications, and otherwise manage
* the upload.
*
* @throws AmazonClientException
* If any errors are encountered in the client while making the
* request or handling the response.
* @throws AmazonServiceException
* If any errors occurred in Amazon S3 while processing the
* request.
*/
public Upload upload(final PutObjectRequest putObjectRequest,
final S3ProgressListener progressListener)
throws AmazonServiceException, AmazonClientException {
return doUpload(putObjectRequest, null, progressListener, null);
}
/**
* <p>
* Schedules a new transfer to upload data to Amazon S3. This method is
* non-blocking and returns immediately (i.e. before the upload has
* finished).
* </p>
* <p>
* Use the returned <code>Upload</code> object to query the progress of the
* transfer, add listeners for progress events, and wait for the upload to
* complete.
* </p>
* <p>
* If resources are available, the upload will begin immediately. Otherwise,
* the upload is scheduled and started as soon as resources become
* available.
* </p>
*
* @param putObjectRequest
* The request containing all the parameters for the upload.
* @param stateListener
* The transfer state change listener to monitor the upload.
* @param progressListener
* An optional callback listener to receive the progress of the
* upload.
*
* @return A new <code>Upload</code> object to use to check the state of the
* upload, listen for progress notifications, and otherwise manage
* the upload.
*
* @throws AmazonClientException
* If any errors are encountered in the client while making the
* request or handling the response.
* @throws AmazonServiceException
* If any errors occurred in Amazon S3 while processing the
* request.
*/
private Upload doUpload(final PutObjectRequest putObjectRequest,
final TransferStateChangeListener stateListener,
final S3ProgressListener progressListener,
final PersistableUpload persistableUpload) throws AmazonServiceException,
AmazonClientException {
appendSingleObjectUserAgent(putObjectRequest);
String multipartUploadId = persistableUpload != null ? persistableUpload
.getMultipartUploadId() : null;
if (putObjectRequest.getMetadata() == null)
putObjectRequest.setMetadata(new ObjectMetadata());
ObjectMetadata metadata = putObjectRequest.getMetadata();
File file = TransferManagerUtils.getRequestFile(putObjectRequest);
if ( file != null ) {
// Always set the content length, even if it's already set
metadata.setContentLength(file.length());
// Only set the content type if it hasn't already been set
if ( metadata.getContentType() == null ) {
metadata.setContentType(Mimetypes.getInstance().getMimetype(file));
}
} else {
if (multipartUploadId != null) {
throw new IllegalArgumentException(
"Unable to resume the upload. No file specified.");
}
}
String description = "Uploading to " + putObjectRequest.getBucketName()
+ "/" + putObjectRequest.getKey();
TransferProgress transferProgress = new TransferProgress();
transferProgress.setTotalBytesToTransfer(TransferManagerUtils
.getContentLength(putObjectRequest));
S3ProgressListenerChain listenerChain = new S3ProgressListenerChain(
new TransferProgressUpdatingListener(transferProgress),
putObjectRequest.getGeneralProgressListener(), progressListener);
putObjectRequest.setGeneralProgressListener(listenerChain);
UploadImpl upload = new UploadImpl(description, transferProgress,
listenerChain, stateListener);
UploadCallable uploadCallable = new UploadCallable(this, threadPool,
upload, putObjectRequest, listenerChain, multipartUploadId,
transferProgress);
UploadMonitor watcher = new UploadMonitor(this, upload, threadPool,
uploadCallable, putObjectRequest, listenerChain);
upload.setMonitor(watcher);
return upload;
}
/**
* Schedules a new transfer to download data from Amazon S3 and save it to
* the specified file. This method is non-blocking and returns immediately
* (i.e. before the data has been fully downloaded).
* <p>
* Use the returned Download object to query the progress of the transfer,
* add listeners for progress events, and wait for the download to complete.
*
* @param bucket
* The name of the bucket containing the object to download.
* @param key
* The key under which the object to download is stored.
* @param file
* The file to download the object's data to.
*
* @return A new <code>Download</code> object to use to check the state of
* the download, listen for progress notifications, and otherwise
* manage the download.
*
* @throws AmazonClientException
* If any errors are encountered in the client while making the
* request or handling the response.
* @throws AmazonServiceException
* If any errors occurred in Amazon S3 while processing the
* request.
*/
public Download download(String bucket, String key, File file) {
return download(new GetObjectRequest(bucket, key), file);
}
/**
* Schedules a new transfer to download data from Amazon S3 and save it to
* the specified file. This method is non-blocking and returns immediately
* (i.e. before the data has been fully downloaded).
* <p>
* Use the returned Download object to query the progress of the transfer,
* add listeners for progress events, and wait for the download to complete.
*
* @param getObjectRequest
* The request containing all the parameters for the download.
* @param file
* The file to download the object data to.
*
* @return A new <code>Download</code> object to use to check the state of
* the download, listen for progress notifications, and otherwise
* manage the download.
*
* @throws AmazonClientException
* If any errors are encountered in the client while making the
* request or handling the response.
* @throws AmazonServiceException
* If any errors occurred in Amazon S3 while processing the
* request.
*/
public Download download(final GetObjectRequest getObjectRequest, final File file) {
return doDownload(getObjectRequest, file, null, null, OVERWRITE_MODE);
}
/**
* Schedules a new transfer to download data from Amazon S3 and save it to
* the specified file. This method is non-blocking and returns immediately
* (i.e. before the data has been fully downloaded).
* <p>
* Use the returned Download object to query the progress of the transfer,
* add listeners for progress events, and wait for the download to complete.
*
* @param getObjectRequest
* The request containing all the parameters for the download.
* @param file
* The file to download the object data to.
* @param progressListener
* An optional callback listener to get the progress of the
* download.
*
* @return A new <code>Download</code> object to use to check the state of
* the download, listen for progress notifications, and otherwise
* manage the download.
*
* @throws AmazonClientException
* If any errors are encountered in the client while making the
* request or handling the response.
* @throws AmazonServiceException
* If any errors occurred in Amazon S3 while processing the
* request.
*/
public Download download(final GetObjectRequest getObjectRequest,
final File file, final S3ProgressListener progressListener) {
return doDownload(getObjectRequest, file, null, progressListener,
OVERWRITE_MODE);
}
/**
* Same as public interface, but adds a state listener so that callers can
* be notified of state changes to the download.
*
* @see TransferManager#download(GetObjectRequest, File)
*/
private Download doDownload(final GetObjectRequest getObjectRequest,
final File file, final TransferStateChangeListener stateListener,
final S3ProgressListener s3progressListener,
final boolean resumeExistingDownload) {
appendSingleObjectUserAgent(getObjectRequest);
String description = "Downloading from " + getObjectRequest.getBucketName() + "/" + getObjectRequest.getKey();
TransferProgress transferProgress = new TransferProgress();
// S3 progress listener to capture the persistable transfer when available
S3ProgressListenerChain listenerChain = new S3ProgressListenerChain(
// The listener for updating transfer progress
new TransferProgressUpdatingListener(transferProgress),
getObjectRequest.getGeneralProgressListener(),
s3progressListener); // Listeners included in the original request
// The listener chain used by the low-level GetObject request.
// This listener chain ignores any COMPLETE event, so that we could
// delay firing the signal until the high-level download fully finishes.
ProgressListenerChain listeners = new ProgressListenerChain(
new ProgressEventFilter() {
@Override
public ProgressEvent filter(ProgressEvent progressEvent) {
// Block COMPLETE events from the low-level GetObject operation,
// but we still want to keep the BytesTransferred
return progressEvent.getEventType() == ProgressEventType.TRANSFER_COMPLETED_EVENT
? null // discard this event
: progressEvent
;
}
}, listenerChain);
getObjectRequest.setGeneralProgressListener(listeners);
GetObjectMetadataRequest getObjectMetadataRequest = new GetObjectMetadataRequest(
getObjectRequest.getBucketName(), getObjectRequest.getKey());
if (getObjectRequest.getSSECustomerKey() != null) {
getObjectMetadataRequest.setSSECustomerKey(getObjectRequest.getSSECustomerKey());
}
if (getObjectRequest.getVersionId() != null) {
getObjectMetadataRequest.setVersionId(getObjectRequest.getVersionId());
}
final ObjectMetadata objectMetadata = s3.getObjectMetadata(getObjectMetadataRequest);
// We still pass the unfiltered listener chain into DownloadImpl
final DownloadImpl download = new DownloadImpl(description,
transferProgress, listenerChain, null, stateListener,
getObjectRequest, file);
long startingByte = 0;
long lastByte = objectMetadata.getContentLength();
if (getObjectRequest.getRange() != null
&& getObjectRequest.getRange().length == 2) {
startingByte = getObjectRequest.getRange()[0];
lastByte = getObjectRequest.getRange()[1];
}
long totalBytesToDownload = lastByte - startingByte;
transferProgress.setTotalBytesToTransfer(totalBytesToDownload);
if (resumeExistingDownload) {
if (file.exists()) {
long numberOfBytesRead = file.length();
startingByte = startingByte + numberOfBytesRead;
getObjectRequest.setRange(startingByte, lastByte);
transferProgress.updateProgress(Math.min(numberOfBytesRead,
totalBytesToDownload));
totalBytesToDownload = lastByte - startingByte;
}
}
if (totalBytesToDownload < 0) {
throw new IllegalArgumentException(
"Unable to determine the range for download operation.");
}
final CountDownLatch latch = new CountDownLatch(1);
Future<?> future = submitDownloadTask(getObjectRequest, file,
resumeExistingDownload, latch, download);
download.setMonitor(new DownloadMonitor(download, future));
latch.countDown();
return download;
}
private Future<?> submitDownloadTask(
final GetObjectRequest getObjectRequest, final File file,
final boolean resumeExistingDownload,
final CountDownLatch latch,
final DownloadImpl download) {
Future<?> future = threadPool.submit(new Callable<Object>() {
@Override
public Object call() throws Exception {
try {
latch.await();
download.setState(TransferState.InProgress);
S3Object s3Object = ServiceUtils.retryableDownloadS3ObjectToFile(file,
new ServiceUtils.RetryableS3DownloadTask() {
@Override
public S3Object getS3ObjectStream() {
S3Object s3Object = s3.getObject(getObjectRequest);
download.setS3Object(s3Object);
return s3Object;
}
@Override
public boolean needIntegrityCheck() {
// Don't perform the integrity check
// if the stream data is wrapped
// in a decryption stream, or if
// we're only looking at a range of
// the data, since otherwise the
// checksum won't match up.
boolean performIntegrityCheck = true;
if (getObjectRequest.getRange() != null)
performIntegrityCheck = false;
if (s3 instanceof AmazonS3Encryption)
performIntegrityCheck = false;
return performIntegrityCheck;
}
}, resumeExistingDownload);
if (s3Object == null) {
download.setState(TransferState.Canceled);
download.setMonitor(new DownloadMonitor(download, null));
return download;
}
download.setState(TransferState.Completed);
return true;
} catch (Throwable t) {
// Downloads aren't allowed to move from canceled to failed
if (download.getState() != TransferState.Canceled) {
download.setState(TransferState.Failed);
}
if (t instanceof Exception)
throw (Exception) t;
else
throw (Error) t;
}
}
});
return future;
}
/**
* Downloads all objects in the virtual directory designated by the
* keyPrefix given to the destination directory given. All virtual
* subdirectories will be downloaded recursively.
*
* @param bucketName
* The bucket containing the virtual directory
* @param keyPrefix
* The key prefix for the virtual directory, or null for the
* entire bucket. All subdirectories will be downloaded
* recursively.
* @param destinationDirectory
* The directory to place downloaded files. Subdirectories will
* be created as necessary.
*/
public MultipleFileDownload downloadDirectory(String bucketName, String keyPrefix, File destinationDirectory) {
if ( keyPrefix == null )
keyPrefix = "";
List<S3ObjectSummary> objectSummaries = new LinkedList<S3ObjectSummary>();
Stack<String> commonPrefixes = new Stack<String>();
commonPrefixes.add(keyPrefix);
long totalSize = 0;
// Recurse all virtual subdirectories to get a list of object summaries.
// This is a depth-first search.
do {
String prefix = commonPrefixes.pop();
ObjectListing listObjectsResponse = null;
do {
if ( listObjectsResponse == null ) {
ListObjectsRequest listObjectsRequest = new ListObjectsRequest().withBucketName(bucketName)
.withDelimiter(DEFAULT_DELIMITER).withPrefix(prefix);
listObjectsResponse = s3.listObjects(listObjectsRequest);
} else {
listObjectsResponse = s3.listNextBatchOfObjects(listObjectsResponse);
}
for ( S3ObjectSummary s : listObjectsResponse.getObjectSummaries() ) {
// Skip any files that are also virtual directories, since
// we can't save both a directory and a file of the same
// name.
if ( !s.getKey().equals(prefix)
&& !listObjectsResponse.getCommonPrefixes().contains(s.getKey() + DEFAULT_DELIMITER) ) {
objectSummaries.add(s);
totalSize += s.getSize();
} else {
log.debug("Skipping download for object " + s.getKey()
+ " since it is also a virtual directory");
}
}
commonPrefixes.addAll(listObjectsResponse.getCommonPrefixes());
} while ( listObjectsResponse.isTruncated() );
} while ( !commonPrefixes.isEmpty() );
/* This is the hook for adding additional progress listeners */
ProgressListenerChain additionalListeners = new ProgressListenerChain();
TransferProgress transferProgress = new TransferProgress();
transferProgress.setTotalBytesToTransfer(totalSize);
/*
* Bind additional progress listeners to this
* MultipleFileTransferProgressUpdatingListener to receive
* ByteTransferred events from each single-file download implementation.
*/
ProgressListener listener = new MultipleFileTransferProgressUpdatingListener(
transferProgress, additionalListeners);
List<DownloadImpl> downloads = new ArrayList<DownloadImpl>();
String description = "Downloading from " + bucketName + "/" + keyPrefix;
final MultipleFileDownloadImpl multipleFileDownload = new MultipleFileDownloadImpl(description, transferProgress,
additionalListeners, keyPrefix, bucketName, downloads);
multipleFileDownload.setMonitor(new MultipleFileTransferMonitor(multipleFileDownload, downloads));
final CountDownLatch latch = new CountDownLatch(1);
MultipleFileTransferStateChangeListener transferListener =
new MultipleFileTransferStateChangeListener(latch, multipleFileDownload);
for ( S3ObjectSummary summary : objectSummaries ) {
// TODO: non-standard delimiters
File f = new File(destinationDirectory, summary.getKey());
File parentFile = f.getParentFile();
if ( !parentFile.exists() && !parentFile.mkdirs() ) {
throw new RuntimeException("Couldn't create parent directories for " + f.getAbsolutePath());
}
// All the single-file downloads share the same
// MultipleFileTransferProgressUpdatingListener and
// MultipleFileTransferStateChangeListener
downloads.add((DownloadImpl) doDownload(
new GetObjectRequest(summary.getBucketName(),
summary.getKey())
.<GetObjectRequest>withGeneralProgressListener(
listener),
f,
transferListener, null, false));
}
if ( downloads.isEmpty() ) {
multipleFileDownload.setState(TransferState.Completed);
return multipleFileDownload;
}
// Notify all state changes waiting for the downloads to all be queued
// to wake up and continue.
latch.countDown();
return multipleFileDownload;
}
/**
* Uploads all files in the directory given to the bucket named, optionally
* recursing for all subdirectories.
* <p>
* S3 will overwrite any existing objects that happen to have the same key,
* just as when uploading individual files, so use with caution.
*
* @param bucketName
* The name of the bucket to upload objects to.
* @param virtualDirectoryKeyPrefix
* The key prefix of the virtual directory to upload to. Use the
* null or empty string to upload files to the root of the
* bucket.
* @param directory
* The directory to upload.
* @param includeSubdirectories
* Whether to include subdirectories in the upload. If true,
* files found in subdirectories will be included with an
* appropriate concatenation to the key prefix.
*/
public MultipleFileUpload uploadDirectory(String bucketName, String virtualDirectoryKeyPrefix, File directory, boolean includeSubdirectories) {
return uploadDirectory(bucketName, virtualDirectoryKeyPrefix, directory, includeSubdirectories, null);
}
/**
* Uploads all files in the directory given to the bucket named, optionally
* recursing for all subdirectories.
* <p>
* S3 will overwrite any existing objects that happen to have the same key,
* just as when uploading individual files, so use with caution.
*
* @param bucketName
* The name of the bucket to upload objects to.
* @param virtualDirectoryKeyPrefix
* The key prefix of the virtual directory to upload to. Use the
* null or empty string to upload files to the root of the
* bucket.
* @param directory
* The directory to upload.
* @param includeSubdirectories
* Whether to include subdirectories in the upload. If true,
* files found in subdirectories will be included with an
* appropriate concatenation to the key prefix.
* @param metadataProvider
* A callback of type <code>ObjectMetadataProvider</code> which
* is used to provide metadata for each file being uploaded.
*/
public MultipleFileUpload uploadDirectory(String bucketName, String virtualDirectoryKeyPrefix, File directory, boolean includeSubdirectories, ObjectMetadataProvider metadataProvider) {
if ( directory == null || !directory.exists() || !directory.isDirectory() ) {
throw new IllegalArgumentException("Must provide a directory to upload");
}
List<File> files = new LinkedList<File>();
listFiles(directory, files, includeSubdirectories);
return uploadFileList(bucketName, virtualDirectoryKeyPrefix, directory, files, metadataProvider);
}
/**
* Uploads all specified files to the bucket named, constructing
* relative keys depending on the commonParentDirectory given.
* <p>
* S3 will overwrite any existing objects that happen to have the same key,
* just as when uploading individual files, so use with caution.
*
* @param bucketName
* The name of the bucket to upload objects to.
* @param virtualDirectoryKeyPrefix
* The key prefix of the virtual directory to upload to. Use the
* null or empty string to upload files to the root of the
* bucket.
* @param directory
* The common parent directory of files to upload. The keys
* of the files in the list of files are constructed relative to
* this directory and the virtualDirectoryKeyPrefix.
* @param files
* A list of files to upload. The keys of the files are
* calculated relative to the common parent directory and the
* virtualDirectoryKeyPrefix.
*/
public MultipleFileUpload uploadFileList(String bucketName, String virtualDirectoryKeyPrefix, File directory, List<File> files) {
return uploadFileList(bucketName, virtualDirectoryKeyPrefix, directory, files, null);
}
/**
* Uploads all specified files to the bucket named, constructing
* relative keys depending on the commonParentDirectory given.
* <p>
* S3 will overwrite any existing objects that happen to have the same key,
* just as when uploading individual files, so use with caution.
*
* @param bucketName
* The name of the bucket to upload objects to.
* @param virtualDirectoryKeyPrefix
* The key prefix of the virtual directory to upload to. Use the
* null or empty string to upload files to the root of the
* bucket.
* @param directory
* The common parent directory of files to upload. The keys
* of the files in the list of files are constructed relative to
* this directory and the virtualDirectoryKeyPrefix.
* @param files
* A list of files to upload. The keys of the files are
* calculated relative to the common parent directory and the
* virtualDirectoryKeyPrefix.
* @param metadataProvider
* A callback of type <code>ObjectMetadataProvider</code> which
* is used to provide metadata for each file being uploaded.
*/
public MultipleFileUpload uploadFileList(String bucketName, String virtualDirectoryKeyPrefix, File directory, List<File> files,ObjectMetadataProvider metadataProvider) {
if ( directory == null || !directory.exists() || !directory.isDirectory() ) {
throw new IllegalArgumentException("Must provide a common base directory for uploaded files");
}
if (virtualDirectoryKeyPrefix == null || virtualDirectoryKeyPrefix.length() == 0) {
virtualDirectoryKeyPrefix = "";
} else if ( !virtualDirectoryKeyPrefix.endsWith("/") ) {
virtualDirectoryKeyPrefix = virtualDirectoryKeyPrefix + "/";
}
/* This is the hook for adding additional progress listeners */
ProgressListenerChain additionalListeners = new ProgressListenerChain();
TransferProgress progress = new TransferProgress();
/*
* Bind additional progress listeners to this
* MultipleFileTransferProgressUpdatingListener to receive
* ByteTransferred events from each single-file upload implementation.
*/
ProgressListener listener = new MultipleFileTransferProgressUpdatingListener(
progress, additionalListeners);
List<UploadImpl> uploads = new LinkedList<UploadImpl>();
MultipleFileUploadImpl multipleFileUpload = new MultipleFileUploadImpl("Uploading etc", progress, additionalListeners, virtualDirectoryKeyPrefix, bucketName, uploads);
multipleFileUpload.setMonitor(new MultipleFileTransferMonitor(multipleFileUpload, uploads));
final CountDownLatch latch = new CountDownLatch(1);
MultipleFileTransferStateChangeListener transferListener =
new MultipleFileTransferStateChangeListener(latch, multipleFileUpload);
if (files == null || files.isEmpty()) {
multipleFileUpload.setState(TransferState.Completed);
} else {
/*
* If the absolute path for the common/base directory does NOT end
* in a separator (which is the case for anything but root
* directories), then we know there's still a separator between the
* base directory and the rest of the file's path, so we increment
* the starting position by one.
*/
int startingPosition = directory.getAbsolutePath().length();
if (!(directory.getAbsolutePath().endsWith(File.separator)))
startingPosition++;
long totalSize = 0;
for (File f : files) {
// Check, if file, since only files can be uploaded.
if (f.isFile()) {
totalSize += f.length();
String key = f.getAbsolutePath()
.substring(startingPosition)
.replaceAll("\\\\", "/");
ObjectMetadata metadata = new ObjectMetadata();
// Invoke the callback if it's present.
// The callback allows the user to customize the metadata
// for each file being uploaded.
if (metadataProvider != null) {
metadataProvider.provideObjectMetadata(f, metadata);
}
// All the single-file uploads share the same
// MultipleFileTransferProgressUpdatingListener and
// MultipleFileTransferStateChangeListener
uploads.add((UploadImpl) doUpload(
new PutObjectRequest(bucketName,
virtualDirectoryKeyPrefix + key, f)
.withMetadata(metadata)
.<PutObjectRequest> withGeneralProgressListener(
listener), transferListener, null, null));
}
}
progress.setTotalBytesToTransfer(totalSize);
}
// Notify all state changes waiting for the uploads to all be queued
// to wake up and continue
latch.countDown();
return multipleFileUpload;
}
/**
* Lists files in the directory given and adds them to the result list
* passed in, optionally adding subdirectories recursively.
*/
private void listFiles(File dir, List<File> results, boolean includeSubDirectories) {
File[] found = dir.listFiles();
if ( found != null ) {
for ( File f : found ) {
if (f.isDirectory()) {
if (includeSubDirectories) {
listFiles(f, results, includeSubDirectories);
}
} else {
results.add(f);
}
}
}
}
/**
* <p>
* Aborts any multipart uploads that were initiated before the specified date.
* </p>
* <p>
* This method is useful for cleaning up any interrupted multipart uploads.
* <code>TransferManager</code> attempts to abort any failed uploads,
* but in some cases this may not be possible, such as if network connectivity
* is completely lost.
* </p>
*
* @param bucketName
* The name of the bucket containing the multipart uploads to
* abort.
* @param date
* The date indicating which multipart uploads should be aborted.
*/
public void abortMultipartUploads(String bucketName, Date date)
throws AmazonServiceException, AmazonClientException {
MultipartUploadListing uploadListing = s3.listMultipartUploads(appendSingleObjectUserAgent(
new ListMultipartUploadsRequest(bucketName)));
do {
for (MultipartUpload upload : uploadListing.getMultipartUploads()) {
if (upload.getInitiated().compareTo(date) < 0) {
s3.abortMultipartUpload(appendSingleObjectUserAgent(new AbortMultipartUploadRequest(
bucketName, upload.getKey(), upload.getUploadId())));
}
}
ListMultipartUploadsRequest request = new ListMultipartUploadsRequest(bucketName)
.withUploadIdMarker(uploadListing.getNextUploadIdMarker())
.withKeyMarker(uploadListing.getNextKeyMarker());
uploadListing = s3.listMultipartUploads(appendSingleObjectUserAgent(request));
} while (uploadListing.isTruncated());
}
/**
* Forcefully shuts down this TransferManager instance - currently executing
* transfers will not be allowed to finish. It also by default shuts down
* the underlying Amazon S3 client.
*
* @see #shutdownNow(boolean)
*/
public void shutdownNow() {
shutdownNow(true);
}
/**
* Forcefully shuts down this TransferManager instance - currently executing
* transfers will not be allowed to finish. Callers should use this method
* when they either:
* <ul>
* <li>have already verified that their transfers have completed by checking
* each transfer's state
* <li>need to exit quickly and don't mind stopping transfers before they
* complete.
* </ul>
* <p>
* Callers should also remember that uploaded parts from an interrupted
* upload may not always be automatically cleaned up, but callers can use
* {@link #abortMultipartUploads(String, Date)} to clean up any upload
* parts.
*
* @param shutDownS3Client
* Whether to shut down the underlying Amazon S3 client.
*/
public void shutdownNow(boolean shutDownS3Client) {
threadPool.shutdownNow();
timedThreadPool.shutdownNow();
if (shutDownS3Client) {
if (s3 instanceof AmazonS3Client) {
((AmazonS3Client)s3).shutdown();
}
}
}
/**
* Shutdown without interrupting the threads involved, so that, for example,
* any upload in progress can complete without throwing
* {@link AbortedException}.
*/
private void shutdown() {
threadPool.shutdown();
timedThreadPool.shutdown();
}
public static <X extends AmazonWebServiceRequest> X appendSingleObjectUserAgent(X request) {
request.getRequestClientOptions().appendUserAgent(USER_AGENT);
return request;
}
public static <X extends AmazonWebServiceRequest> X appendMultipartUserAgent(X request) {
request.getRequestClientOptions().appendUserAgent(USER_AGENT_MULTIPART);
return request;
}
private static final String USER_AGENT = TransferManager.class.getName() + "/" + VersionInfoUtils.getVersion();
private static final String USER_AGENT_MULTIPART = TransferManager.class.getName() + "_multipart/" + VersionInfoUtils.getVersion();
private static final String DEFAULT_DELIMITER = "/";
/**
* There is no need for threads from timedThreadPool if there is no more running threads in current process,
* so we need a daemon thread factory for it.
*/
private static final ThreadFactory daemonThreadFactory = new ThreadFactory() {
final AtomicInteger threadCount = new AtomicInteger( 0 );
public Thread newThread(Runnable r) {
int threadNumber = threadCount.incrementAndGet();
Thread thread = new Thread(r);
thread.setDaemon(true);
thread.setName("S3TransferManagerTimedThread-" + threadNumber);
return thread;
}
};
/**
* <p>
* Schedules a new transfer to copy data from one Amazon S3 location to
* another Amazon S3 location. This method is non-blocking and returns
* immediately (i.e. before the copy has finished).
* </p>
* <p>
* <code>TransferManager</code> doesn't support copying of encrypted objects
* whose encryption materials is stored in instruction file.
* </p>
* <p>
* Use the returned <code>Copy</code> object to check if the copy is
* complete.
* </p>
* <p>
* If resources are available, the copy request will begin immediately.
* Otherwise, the copy is scheduled and started as soon as resources become
* available.
* </p>
*
* @param sourceBucketName
* The name of the bucket from where the object is to be copied.
* @param sourceKey
* The name of the Amazon S3 object.
* @param destinationBucketName
* The name of the bucket to where the Amazon S3 object has to be
* copied.
* @param destinationKey
* The name of the object in the destination bucket.
*
* @return A new <code>Copy</code> object to use to check the state of the
* copy request being processed.
*
* @throws AmazonClientException
* If any errors are encountered in the client while making the
* request or handling the response.
* @throws AmazonServiceException
* If any errors occurred in Amazon S3 while processing the
* request.
*/
public Copy copy(String sourceBucketName, String sourceKey,
String destinationBucketName, String destinationKey)
throws AmazonServiceException, AmazonClientException {
return copy(new CopyObjectRequest(sourceBucketName, sourceKey,
destinationBucketName, destinationKey));
}
/**
* <p>
* Schedules a new transfer to copy data from one Amazon S3 location to
* another Amazon S3 location. This method is non-blocking and returns
* immediately (i.e. before the copy has finished).
* </p>
* <p>
* <code>TransferManager</code> doesn't support copying of encrypted objects whose
* encryption materials is stored i instruction file.
* </p>
* <p>
* Use the returned <code>Copy</code> object to check if the copy is
* complete.
* </p>
* <p>
* If resources are available, the copy request will begin immediately.
* Otherwise, the copy is scheduled and started as soon as resources become
* available.
* </p>
*
* @param copyObjectRequest
* The request containing all the parameters for the copy.
*
* @return A new <code>Copy</code> object to use to check the state of the
* copy request being processed.
*
* @throws AmazonClientException
* If any errors are encountered in the client while making the
* request or handling the response.
* @throws AmazonServiceException
* If any errors occurred in Amazon S3 while processing the
* request.
*/
public Copy copy(final CopyObjectRequest copyObjectRequest){
return copy(copyObjectRequest,null);
}
/**
* <p>
* Schedules a new transfer to copy data from one Amazon S3 location to
* another Amazon S3 location. This method is non-blocking and returns
* immediately (i.e. before the copy has finished).
* </p>
* <p>
* <code>TransferManager</code> doesn't support copying of encrypted objects whose
* encryption materials is stored in instruction file.
* </p>
* <p>
* Use the returned <code>Copy</code> object to check if the copy is
* complete.
* </p>
* <p>
* If resources are available, the copy request will begin immediately.
* Otherwise, the copy is scheduled and started as soon as resources become
* available.
* </p>
*
* @param copyObjectRequest
* The request containing all the parameters for the copy.
* @param stateChangeListener
* The transfer state change listener to monitor the copy request
* @return A new <code>Copy</code> object to use to check the state of the
* copy request being processed.
*
* @throws AmazonClientException
* If any errors are encountered in the client while making the
* request or handling the response.
* @throws AmazonServiceException
* If any errors occurred in Amazon S3 while processing the
* request.
*/
public Copy copy(final CopyObjectRequest copyObjectRequest,
final TransferStateChangeListener stateChangeListener)
throws AmazonServiceException, AmazonClientException {
appendSingleObjectUserAgent(copyObjectRequest);
assertParameterNotNull(copyObjectRequest.getSourceBucketName(),
"The source bucket name must be specified when a copy request is initiated.");
assertParameterNotNull(copyObjectRequest.getSourceKey(),
"The source object key must be specified when a copy request is initiated.");
assertParameterNotNull(
copyObjectRequest.getDestinationBucketName(),
"The destination bucket name must be specified when a copy request is initiated.");
assertParameterNotNull(
copyObjectRequest.getDestinationKey(),
"The destination object key must be specified when a copy request is initiated.");
String description = "Copying object from "
+ copyObjectRequest.getSourceBucketName() + "/"
+ copyObjectRequest.getSourceKey() + " to "
+ copyObjectRequest.getDestinationBucketName() + "/"
+ copyObjectRequest.getDestinationKey();
GetObjectMetadataRequest getObjectMetadataRequest =
new GetObjectMetadataRequest(
copyObjectRequest.getSourceBucketName(),
copyObjectRequest.getSourceKey())
.withSSECustomerKey(copyObjectRequest.getSourceSSECustomerKey());
ObjectMetadata metadata = s3.getObjectMetadata(getObjectMetadataRequest);
TransferProgress transferProgress = new TransferProgress();
transferProgress.setTotalBytesToTransfer(metadata.getContentLength());
ProgressListenerChain listenerChain = new ProgressListenerChain(
new TransferProgressUpdatingListener(transferProgress));
CopyImpl copy = new CopyImpl(description, transferProgress,
listenerChain, stateChangeListener);
CopyCallable copyCallable = new CopyCallable(this, threadPool, copy,
copyObjectRequest, metadata, listenerChain);
CopyMonitor watcher = new CopyMonitor(this, copy, threadPool,
copyCallable, copyObjectRequest, listenerChain);
watcher.setTimedThreadPool(timedThreadPool);
copy.setMonitor(watcher);
return copy;
}
/**
* Resumes an upload operation. This upload operation uses the same
* configuration {@link TransferManagerConfiguration} as the original
* upload. Any data already uploaded will be skipped, and only the remaining
* will be uploaded to Amazon S3.
*
* @param persistableUpload
* the upload to resume.
* @return A new <code>Upload</code> object to use to check the state of the
* upload, listen for progress notifications, and otherwise manage
* the upload.
*
* @throws AmazonClientException
* If any errors are encountered in the client while making the
* request or handling the response.
* @throws AmazonServiceException
* If any errors occurred in Amazon S3 while processing the
* request.
*/
public Upload resumeUpload(PersistableUpload persistableUpload) {
assertParameterNotNull(persistableUpload,
"PauseUpload is mandatory to resume a upload.");
configuration.setMinimumUploadPartSize(persistableUpload.getPartSize());
configuration.setMultipartUploadThreshold(persistableUpload
.getMutlipartUploadThreshold());
return doUpload(new PutObjectRequest(persistableUpload.getBucketName(),
persistableUpload.getKey(), new File(persistableUpload.getFile())), null, null,
persistableUpload);
}
/**
* Resumes an download operation. This download operation uses the same
* configuration as the original download. Any data already fetched will be
* skipped, and only the remaining data is retrieved from Amazon S3.
*
* @param persistableDownload
* the download to resume.
* @return A new <code>Download</code> object to use to check the state of
* the download, listen for progress notifications, and otherwise
* manage the download.
*
* @throws AmazonClientException
* If any errors are encountered in the client while making the
* request or handling the response.
* @throws AmazonServiceException
* If any errors occurred in Amazon S3 while processing the
* request.
*/
public Download resumeDownload(PersistableDownload persistableDownload) {
assertParameterNotNull(persistableDownload,
"PausedDownload is mandatory to resume a download.");
GetObjectRequest request = new GetObjectRequest(
persistableDownload.getBucketName(), persistableDownload.getKey(),
persistableDownload.getVersionId());
if (persistableDownload.getRange() != null
&& persistableDownload.getRange().length == 2) {
long[] range = persistableDownload.getRange();
request.setRange(range[0], range[1]);
}
request.setRequesterPays(persistableDownload.isRequesterPays());
request.setResponseHeaders(persistableDownload.getResponseHeaders());
return doDownload(request, new File(persistableDownload.getFile()), null, null,
APPEND_MODE);
}
/**
* <p>
* Asserts that the specified parameter value is not <code>null</code> and if it is,
* throws an <code>IllegalArgumentException</code> with the specified error message.
* </p>
*
* @param parameterValue
* The parameter value being checked.
* @param errorMessage
* The error message to include in the IllegalArgumentException
* if the specified parameter is null.
*/
private void assertParameterNotNull(Object parameterValue, String errorMessage) {
if (parameterValue == null) throw new IllegalArgumentException(errorMessage);
}
/**
* Releasing all resources created by <code>TransferManager</code> before it
* is being garbage collected.
*/
@Override
protected void finalize() throws Throwable {
shutdown();
}
}