/*
* Copyright 2010-2011 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.sqs;
import org.w3c.dom.Node;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map.Entry;
import com.amazonaws.*;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWS3Signer;
import com.amazonaws.auth.QueryStringSigner;
import com.amazonaws.handlers.HandlerChainFactory;
import com.amazonaws.handlers.RequestHandler;
import com.amazonaws.http.StaxResponseHandler;
import com.amazonaws.http.DefaultErrorResponseHandler;
import com.amazonaws.http.HttpClient;
import com.amazonaws.http.ExecutionContext;
import com.amazonaws.transform.Unmarshaller;
import com.amazonaws.transform.StaxUnmarshallerContext;
import com.amazonaws.transform.StandardErrorUnmarshaller;
import com.amazonaws.services.sqs.model.*;
import com.amazonaws.services.sqs.model.transform.*;
/**
* Client for accessing AmazonSQS. All service calls made
* using this client are blocking, and will not return until the service call
* completes.
* <p>
* Amazon Simple Queue Service <p>
* Amazon Simple Queue Service (Amazon SQS) offers a reliable, highly
* scalable, hosted queue for storing messages as they travel between
* computers. By using Amazon SQS, developers can simply move data
* between distributed components of their applications that perform
* different tasks, without losing messages or requiring each component
* to be always available. Amazon SQS makes it easy to build an automated
* workflow, working in close conjunction with the Amazon Elastic Compute
* Cloud (Amazon EC2) and the other AWS infrastructure web services.
* </p>
* <p>
* Amazon SQS works by exposing Amazon's web-scale messaging
* infrastructure as a web service. Any computer on the Internet can add
* or read messages without any installed software or special firewall
* configurations. Components of applications using Amazon SQS can run
* independently, and do not need to be on the same network, developed
* with the same technologies, or running at the same time.
* </p>
* <p>
* Visit <a href="http://aws.amazon.com/sqs/">
* http://aws.amazon.com/sqs/ </a> for more information.
* </p>
*/
public class AmazonSQSClient extends AmazonWebServiceClient implements AmazonSQS {
/**
* The AWS credentials (access key ID and secret key) to use when
* authenticating with AWS services.
*/
private AWSCredentials awsCredentials;
/**
* List of exception unmarshallers for all AmazonSQS exceptions.
*/
protected final List<Unmarshaller<AmazonServiceException, Node>> exceptionUnmarshallers;
/** Low level client for sending requests to AWS services. */
protected final HttpClient client;
/** Optional request handlers for additional request processing. */
private final List<RequestHandler> requestHandlers;
/** AWS signer for authenticating requests. */
private QueryStringSigner signer;
/**
* Constructs a new client to invoke service methods on
* AmazonSQS using the specified AWS account credentials.
*
* <p>
* All service calls made using this new client object are blocking, and will not
* return until the service call completes.
*
* @param awsCredentials The AWS credentials (access key ID and secret key) to use
* when authenticating with AWS services.
*/
public AmazonSQSClient(AWSCredentials awsCredentials) {
this(awsCredentials, new ClientConfiguration());
}
/**
* Constructs a new client to invoke service methods on
* AmazonSQS using the specified AWS account credentials
* and client configuration options.
*
* <p>
* All service calls made using this new client object are blocking, and will not
* return until the service call completes.
*
* @param awsCredentials The AWS credentials (access key ID and secret key) to use
* when authenticating with AWS services.
* @param clientConfiguration The client configuration options controlling how this
* client connects to AmazonSQS
* (ex: proxy settings, retry counts, etc.).
*/
public AmazonSQSClient(AWSCredentials awsCredentials, ClientConfiguration clientConfiguration) {
super(clientConfiguration);
this.awsCredentials = awsCredentials;
exceptionUnmarshallers = new ArrayList<Unmarshaller<AmazonServiceException, Node>>();
exceptionUnmarshallers.add(new QueueDeletedRecentlyExceptionUnmarshaller());
exceptionUnmarshallers.add(new QueueNameExistsExceptionUnmarshaller());
exceptionUnmarshallers.add(new InvalidAttributeNameExceptionUnmarshaller());
exceptionUnmarshallers.add(new ReceiptHandleIsInvalidExceptionUnmarshaller());
exceptionUnmarshallers.add(new InvalidMessageContentsExceptionUnmarshaller());
exceptionUnmarshallers.add(new StandardErrorUnmarshaller());
setEndpoint("queue.amazonaws.com");
signer = new QueryStringSigner();
HandlerChainFactory chainFactory = new HandlerChainFactory();
requestHandlers = Collections.synchronizedList(chainFactory.newRequestHandlerChain(
"/com/amazonaws/services/sqs/request.handlers"));
client = new HttpClient(clientConfiguration);
}
/**
* Appends a request handler to the list of registered handlers that are run
* as part of a request's lifecycle.
*
* @param requestHandler
* The new handler to add to the current list of request
* handlers.
*/
public void addRequestHandler(RequestHandler requestHandler) {
requestHandlers.add(requestHandler);
}
/**
* <p>
* The ListQueues action returns a list of your queues.
* </p>
*
* @param listQueuesRequest Container for the necessary parameters to
* execute the ListQueues service method on AmazonSQS.
*
* @return The response from the ListQueues service method, as returned
* by AmazonSQS.
*
*
* @throws AmazonClientException
* If any internal errors are encountered inside the client while
* attempting to make the request or handle the response. For example
* if a network connection is not available.
* @throws AmazonServiceException
* If an error response is returned by AmazonSQS indicating
* either a problem with the data in the request, or a server side issue.
*/
public ListQueuesResult listQueues(ListQueuesRequest listQueuesRequest)
throws AmazonServiceException, AmazonClientException {
Request<ListQueuesRequest> request = new ListQueuesRequestMarshaller().marshall(listQueuesRequest);
return invoke(request, new ListQueuesResultStaxUnmarshaller());
}
/**
* <p>
* Sets an attribute of a queue. Currently, you can set only the
* VisibilityTimeout attribute for a queue.
* </p>
*
* @param setQueueAttributesRequest Container for the necessary
* parameters to execute the SetQueueAttributes service method on
* AmazonSQS.
*
* @throws InvalidAttributeNameException
*
* @throws AmazonClientException
* If any internal errors are encountered inside the client while
* attempting to make the request or handle the response. For example
* if a network connection is not available.
* @throws AmazonServiceException
* If an error response is returned by AmazonSQS indicating
* either a problem with the data in the request, or a server side issue.
*/
public void setQueueAttributes(SetQueueAttributesRequest setQueueAttributesRequest)
throws AmazonServiceException, AmazonClientException {
Request<SetQueueAttributesRequest> request = new SetQueueAttributesRequestMarshaller().marshall(setQueueAttributesRequest);
invoke(request, null);
}
/**
* <p>
* The ChangeMessageVisibility action changes the visibility timeout of
* a specified message in a queue to a new value. The maximum allowed
* timeout value you can set the value to is 12 hours. This means you
* can't extend the timeout of a message in an existing queue to more
* than a total visibility timeout of 12 hours. (For more information
* visibility timeout, see Visibility Timeout in the Amazon SQS Developer
* Guide.)
* </p>
* <p>
* For example, let's say you have a message and its default message
* visibility timeout is 30 minutes. You could call
* ChangeMessageVisiblity with a value of two hours and the effective
* timeout would be two hours and 30 minutes. When that time comes near
* you could again extend the time out by calling ChangeMessageVisiblity,
* but this time the maximum allowed timeout would be 9 hours and 30
* minutes.
* </p>
* <p>
* <b>IMPORTANT:</b> If you attempt to set the VisibilityTimeout to an
* amount more than the maximum time left, Amazon SQS returns an error.
* It will not automatically recalculate and increase the timeout to the
* maximum time remaining.
* </p>
* <p>
* <b>IMPORTANT:</b> Unlike with a queue, when you change the visibility
* timeout for a specific message, that timeout value is applied
* immediately but is not saved in memory for that message. If you don't
* delete a message after it is received, the visibility timeout for the
* message the next time it is received reverts to the original timeout
* value, not the value you set with the ChangeMessageVisibility action.
* </p>
*
* @param changeMessageVisibilityRequest Container for the necessary
* parameters to execute the ChangeMessageVisibility service method on
* AmazonSQS.
*
*
* @throws AmazonClientException
* If any internal errors are encountered inside the client while
* attempting to make the request or handle the response. For example
* if a network connection is not available.
* @throws AmazonServiceException
* If an error response is returned by AmazonSQS indicating
* either a problem with the data in the request, or a server side issue.
*/
public void changeMessageVisibility(ChangeMessageVisibilityRequest changeMessageVisibilityRequest)
throws AmazonServiceException, AmazonClientException {
Request<ChangeMessageVisibilityRequest> request = new ChangeMessageVisibilityRequestMarshaller().marshall(changeMessageVisibilityRequest);
invoke(request, null);
}
/**
* <p>
* The CreateQueue action creates a new queue, or returns the URL of an
* existing one. When you request CreateQueue, you provide a name for the
* queue. To successfully create a new queue, you must provide a name
* that is unique within the scope of your own queues. If you provide the
* name of an existing queue, a new queue isn't created and an error
* isn't returned. Instead, the request succeeds and the queue URL for
* the existing queue is returned.
* </p>
* <p>
* <b>IMPORTANT:</b> If you provide a value for DefaultVisibilityTimeout
* that is different from the value for the existing queue, you receive
* an error.
* </p>
*
* @param createQueueRequest Container for the necessary parameters to
* execute the CreateQueue service method on AmazonSQS.
*
* @return The response from the CreateQueue service method, as returned
* by AmazonSQS.
*
* @throws QueueNameExistsException
* @throws QueueDeletedRecentlyException
*
* @throws AmazonClientException
* If any internal errors are encountered inside the client while
* attempting to make the request or handle the response. For example
* if a network connection is not available.
* @throws AmazonServiceException
* If an error response is returned by AmazonSQS indicating
* either a problem with the data in the request, or a server side issue.
*/
public CreateQueueResult createQueue(CreateQueueRequest createQueueRequest)
throws AmazonServiceException, AmazonClientException {
Request<CreateQueueRequest> request = new CreateQueueRequestMarshaller().marshall(createQueueRequest);
return invoke(request, new CreateQueueResultStaxUnmarshaller());
}
/**
* <p>
* The RemovePermission action revokes any permissions in the queue
* policy that matches the specified <i>Label</i> parameter. Only the
* owner of the queue can remove permissions.
* </p>
*
* @param removePermissionRequest Container for the necessary parameters
* to execute the RemovePermission service method on AmazonSQS.
*
*
* @throws AmazonClientException
* If any internal errors are encountered inside the client while
* attempting to make the request or handle the response. For example
* if a network connection is not available.
* @throws AmazonServiceException
* If an error response is returned by AmazonSQS indicating
* either a problem with the data in the request, or a server side issue.
*/
public void removePermission(RemovePermissionRequest removePermissionRequest)
throws AmazonServiceException, AmazonClientException {
Request<RemovePermissionRequest> request = new RemovePermissionRequestMarshaller().marshall(removePermissionRequest);
invoke(request, null);
}
/**
* <p>
* Gets one or all attributes of a queue. Queues currently have two
* attributes you can get: ApproximateNumberOfMessages and
* VisibilityTimeout.
* </p>
*
* @param getQueueAttributesRequest Container for the necessary
* parameters to execute the GetQueueAttributes service method on
* AmazonSQS.
*
* @return The response from the GetQueueAttributes service method, as
* returned by AmazonSQS.
*
* @throws InvalidAttributeNameException
*
* @throws AmazonClientException
* If any internal errors are encountered inside the client while
* attempting to make the request or handle the response. For example
* if a network connection is not available.
* @throws AmazonServiceException
* If an error response is returned by AmazonSQS indicating
* either a problem with the data in the request, or a server side issue.
*/
public GetQueueAttributesResult getQueueAttributes(GetQueueAttributesRequest getQueueAttributesRequest)
throws AmazonServiceException, AmazonClientException {
Request<GetQueueAttributesRequest> request = new GetQueueAttributesRequestMarshaller().marshall(getQueueAttributesRequest);
return invoke(request, new GetQueueAttributesResultStaxUnmarshaller());
}
/**
* <p>
* The AddPermission action adds a permission to a queue for a specific
* principal. This allows for sharing access to the queue.
* </p>
* <p>
* When you create a queue, you have full control access rights for the
* queue. Only you (as owner of the queue) can grant or deny permissions
* to the queue. For more information about these permissions, see Shared
* Queues in the Amazon SQS Developer Guide.
* </p>
*
* @param addPermissionRequest Container for the necessary parameters to
* execute the AddPermission service method on AmazonSQS.
*
*
* @throws AmazonClientException
* If any internal errors are encountered inside the client while
* attempting to make the request or handle the response. For example
* if a network connection is not available.
* @throws AmazonServiceException
* If an error response is returned by AmazonSQS indicating
* either a problem with the data in the request, or a server side issue.
*/
public void addPermission(AddPermissionRequest addPermissionRequest)
throws AmazonServiceException, AmazonClientException {
Request<AddPermissionRequest> request = new AddPermissionRequestMarshaller().marshall(addPermissionRequest);
invoke(request, null);
}
/**
* <p>
* This action unconditionally deletes the queue specified by the queue
* URL. Use this operation WITH CARE! The queue is deleted even if it is
* NOT empty.
* </p>
*
* @param deleteQueueRequest Container for the necessary parameters to
* execute the DeleteQueue service method on AmazonSQS.
*
*
* @throws AmazonClientException
* If any internal errors are encountered inside the client while
* attempting to make the request or handle the response. For example
* if a network connection is not available.
* @throws AmazonServiceException
* If an error response is returned by AmazonSQS indicating
* either a problem with the data in the request, or a server side issue.
*/
public void deleteQueue(DeleteQueueRequest deleteQueueRequest)
throws AmazonServiceException, AmazonClientException {
Request<DeleteQueueRequest> request = new DeleteQueueRequestMarshaller().marshall(deleteQueueRequest);
invoke(request, null);
}
/**
* <p>
* The DeleteMessage action unconditionally removes the specified
* message from the specified queue. Even if the message is locked by
* another reader due to the visibility timeout setting, it is still
* deleted from the queue.
* </p>
*
* @param deleteMessageRequest Container for the necessary parameters to
* execute the DeleteMessage service method on AmazonSQS.
*
* @throws ReceiptHandleIsInvalidException
*
* @throws AmazonClientException
* If any internal errors are encountered inside the client while
* attempting to make the request or handle the response. For example
* if a network connection is not available.
* @throws AmazonServiceException
* If an error response is returned by AmazonSQS indicating
* either a problem with the data in the request, or a server side issue.
*/
public void deleteMessage(DeleteMessageRequest deleteMessageRequest)
throws AmazonServiceException, AmazonClientException {
Request<DeleteMessageRequest> request = new DeleteMessageRequestMarshaller().marshall(deleteMessageRequest);
invoke(request, null);
}
/**
* <p>
* The SendMessage action delivers a message to the specified queue.
* </p>
*
* @param sendMessageRequest Container for the necessary parameters to
* execute the SendMessage service method on AmazonSQS.
*
* @return The response from the SendMessage service method, as returned
* by AmazonSQS.
*
* @throws InvalidMessageContentsException
*
* @throws AmazonClientException
* If any internal errors are encountered inside the client while
* attempting to make the request or handle the response. For example
* if a network connection is not available.
* @throws AmazonServiceException
* If an error response is returned by AmazonSQS indicating
* either a problem with the data in the request, or a server side issue.
*/
public SendMessageResult sendMessage(SendMessageRequest sendMessageRequest)
throws AmazonServiceException, AmazonClientException {
Request<SendMessageRequest> request = new SendMessageRequestMarshaller().marshall(sendMessageRequest);
return invoke(request, new SendMessageResultStaxUnmarshaller());
}
/**
* <p>
* Retrieves one or more messages from the specified queue, including
* the message body and message ID of each message. Messages returned by
* this action stay in the queue until you delete them. However, once a
* message is returned to a ReceiveMessage request, it is not returned on
* subsequent ReceiveMessage requests for the duration of the
* VisibilityTimeout. If you do not specify a VisibilityTimeout in the
* request, the overall visibility timeout for the queue is used for the
* returned messages.
* </p>
*
* @param receiveMessageRequest Container for the necessary parameters to
* execute the ReceiveMessage service method on AmazonSQS.
*
* @return The response from the ReceiveMessage service method, as
* returned by AmazonSQS.
*
*
* @throws AmazonClientException
* If any internal errors are encountered inside the client while
* attempting to make the request or handle the response. For example
* if a network connection is not available.
* @throws AmazonServiceException
* If an error response is returned by AmazonSQS indicating
* either a problem with the data in the request, or a server side issue.
*/
public ReceiveMessageResult receiveMessage(ReceiveMessageRequest receiveMessageRequest)
throws AmazonServiceException, AmazonClientException {
Request<ReceiveMessageRequest> request = new ReceiveMessageRequestMarshaller().marshall(receiveMessageRequest);
return invoke(request, new ReceiveMessageResultStaxUnmarshaller());
}
/**
* <p>
* The ListQueues action returns a list of your queues.
* </p>
*
* @return The response from the ListQueues service method, as returned
* by AmazonSQS.
*
*
* @throws AmazonClientException
* If any internal errors are encountered inside the client while
* attempting to make the request or handle the response. For example
* if a network connection is not available.
* @throws AmazonServiceException
* If an error response is returned by AmazonSQS indicating
* either a problem with the data in the request, or a server side issue.
*/
public ListQueuesResult listQueues() throws AmazonServiceException, AmazonClientException {
return listQueues(new ListQueuesRequest());
}
/**
* Returns additional metadata for a previously executed successful, request, typically used for
* debugging issues where a service isn't acting as expected. This data isn't considered part
* of the result data returned by an operation, so it's available through this separate,
* diagnostic interface.
* <p>
* Response metadata is only cached for a limited period of time, so if you need to access
* this extra diagnostic information for an executed request, you should use this method
* to retrieve it as soon as possible after executing the request.
*
* @param request
* The originally executed request
*
* @return The response metadata for the specified request, or null if none
* is available.
*/
public ResponseMetadata getCachedResponseMetadata(AmazonWebServiceRequest request) {
return client.getResponseMetadataForRequest(request);
}
private <X, Y extends AmazonWebServiceRequest> X invoke(Request<Y> request, Unmarshaller<X, StaxUnmarshallerContext> unmarshaller) {
request.setEndpoint(endpoint);
for (Entry<String, String> entry : request.getOriginalRequest().copyPrivateRequestParameters().entrySet()) {
request.addParameter(entry.getKey(), entry.getValue());
}
// Apply any additional service specific request handlers that need to be run
if (requestHandlers != null) {
for (RequestHandler requestHandler : requestHandlers) {
requestHandler.beforeRequest(request);
}
}
if (request.getOriginalRequest().getRequestCredentials() != null) {
signer.sign(request, request.getOriginalRequest().getRequestCredentials());
} else {
signer.sign(request, awsCredentials);
}
StaxResponseHandler<X> responseHandler = new StaxResponseHandler<X>(unmarshaller);
DefaultErrorResponseHandler errorResponseHandler = new DefaultErrorResponseHandler(exceptionUnmarshallers);
ExecutionContext executionContext = new ExecutionContext(requestHandlers);
return (X)client.execute(request, responseHandler, errorResponseHandler, executionContext);
}
}