Examples of com.google.common.io.Closer

com.google.common.io.Closer
oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html"> try-with-resources statement in JDK6-compatible code. Running on Java 7, code using this should be approximately equivalent in behavior to the same code written with try-with-resources. Running on Java 6, exceptions that cannot be thrown must be logged rather than being added to the thrown exception as a suppressed exception.
This class is intended to be used in the following pattern:
```
    {@code Closer closer = Closer.create();}try  InputStream in = closer.register(openInputStream()); OutputStream out = closer.register(openOutputStream()); // do stuff } catch (Throwable e) { // ensure that any checked exception types other than IOException that could be thrown are // provided here, e.g. throw closer.rethrow(e, CheckedException.class); throw closer.rethrow(e); } finally { closer.close(); }}
```
Note that this try-catch-finally block is not equivalent to a try-catch-finally block using try-with-resources. To get the equivalent of that, you must wrap the above code in another try block in order to catch any exception that may be thrown (including from the call to {@code close()}).
This pattern ensures the following:
- Each {@code Closeable} resource that is successfully registered will be closed later.
- If a {@code Throwable} is thrown in the try block, no exceptions that occur when attemptingto close resources will be thrown from the finally block. The throwable from the try block will be thrown.
- If no exceptions or errors were thrown in the try block, the first exception thrown by an attempt to close a resource will be thrown.
- Any exception caught when attempting to close a resource that is not thrown (because another exception is already being thrown) is suppressed.
An exception that is suppressed is not thrown. The method of suppression used depends on the version of Java the code is running on:
- Java 7+: Exceptions are suppressed by adding them to the exception that will be thrown using {@code Throwable.addSuppressed(Throwable)}.
- Java 6: Exceptions are suppressed by logging them instead.
@author Colin Decker @since 14.0

      int fileId = tachyonClient.createFile(dstPath);
      if (fileId == -1) {
        return -1;
      }
      TachyonFile tFile = tachyonClient.getFile(fileId);
      Closer closer = Closer.create();
      try {
        OutStream os = closer.register(tFile.getOutStream(UserConf.get().DEFAULT_WRITE_TYPE));
        FileInputStream in = closer.register(new FileInputStream(src));
        FileChannel channel = closer.register(in.getChannel());
        ByteBuffer buf = ByteBuffer.allocate(Constants.KB);
        while (channel.read(buf) != -1) {
          buf.flip();
          os.write(buf.array(), 0, buf.limit());
        }
      } finally {
        closer.close();
      }
      return 0;
    } else {
      tachyonClient.mkdir(dstPath);
      for (String file : src.list()) {

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    // tachyonClient.getFile() catches FileDoesNotExist exceptions and returns null
    if (tFile == null) {
      throw new IOException(srcPath.toString());
    }


    Closer closer = Closer.create();
    try {
      InStream is = closer.register(tFile.getInStream(ReadType.NO_CACHE));
      FileOutputStream out = closer.register(new FileOutputStream(dst));
      byte[] buf = new byte[512];
      int t = is.read(buf);
      while (t != -1) {
        out.write(buf, 0, t);
        t = is.read(buf);
      }
      System.out.println("Copied " + srcPath + " to " + dstPath);
      return 0;
    } finally {
      closer.close();
    }
  }

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    if (size == -1) {
      LOG.error("Block file doesn't exist! blockId:" + blockId);
      return false;
    }
    boolean copySuccess = false;
    Closer closer = Closer.create();
    try {
      BlockHandler bhSrc = closer.register(getBlockHandler(blockId));
      BlockHandler bhDst = closer.register(dstDir.getBlockHandler(blockId));
      ByteBuffer srcBuf = bhSrc.read(0, (int) size);
      copySuccess = (bhDst.append(0, srcBuf) == size);
    } finally {
      closer.close();
    }
    if (copySuccess) {
      dstDir.addBlockId(blockId, size);
    }
    return copySuccess;

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    // Because chmod doesn't have a lot of error or output messages, its safe to process the output
    // after the process is done. As of java 7, you can have the process redirect to System.out
    // and System.err without forking a process.
    // TODO when java 6 support is dropped, switch to
    // http://docs.oracle.com/javase/7/docs/api/java/lang/ProcessBuilder.html#inheritIO()
    Closer closer = Closer.create();
    try {
      ByteStreams.copy(closer.register(process.getInputStream()), System.out);
      ByteStreams.copy(closer.register(process.getErrorStream()), System.err);
    } catch (Throwable e) {
      throw closer.rethrow(e);
    } finally {
      closer.close();
    }
  }

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            continue;
          }
          for (int k = 0; k < fileInfo.blockIds.size(); k ++) {
            lockBlock(fileInfo.blockIds.get(k), Users.CHECKPOINT_USER_ID);
          }
          Closer closer = Closer.create();
          long fileSizeByte = 0;
          try {
            OutputStream os = 
                closer.register(mCheckpointUfs.create(midPath, (int) fileInfo.getBlockSizeByte()));
            for (int k = 0; k < fileInfo.blockIds.size(); k ++) {
              File tempFile =
                  new File(CommonUtils.concat(mLocalDataFolder.toString(),
                      fileInfo.blockIds.get(k)));
              fileSizeByte += tempFile.length();
              InputStream is = closer.register(new FileInputStream(tempFile));
              byte[] buf = new byte[16 * Constants.KB];
              int got = is.read(buf);
              while (got != -1) {
                os.write(buf, 0, got);
                got = is.read(buf);
              }
            }
          } finally {
            closer.close();
            for (int k = 0; k < fileInfo.blockIds.size(); k ++) {
              unlockBlock(fileInfo.blockIds.get(k), Users.CHECKPOINT_USER_ID);
            }
          }
          if (!mCheckpointUfs.rename(midPath, dstPath)) {

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    int blockLockId = mTachyonFS.getBlockLockId();
    if (!mTachyonFS.lockBlock(blockId, blockLockId)) {
      return null;
    }
    String localFileName = getLocalFilename(blockIndex);
    Closer closer = Closer.create();
    if (localFileName != null) {
      try {
        RandomAccessFile localFile = closer.register(new RandomAccessFile(localFileName, "r"));


        long fileLength = localFile.length();
        String error = null;
        if (offset > fileLength) {
          error = String.format("Offset(%d) is larger than file length(%d)", offset, fileLength);
        }
        if (error == null && len != -1 && offset + len > fileLength) {
          error =
              String.format("Offset(%d) plus length(%d) is larger than file length(%d)", offset,
                  len, fileLength);
        }
        if (error != null) {
          throw new IOException(error);
        }


        if (len == -1) {
          len = fileLength - offset;
        }


        FileChannel localFileChannel = closer.register(localFile.getChannel());
        final ByteBuffer buf = localFileChannel.map(FileChannel.MapMode.READ_ONLY, offset, len);
        mTachyonFS.accessLocalBlock(blockId);
        return new TachyonByteBuffer(mTachyonFS, buf, blockId, blockLockId);
      } catch (FileNotFoundException e) {
        LOG.info(localFileName + " is not on local disk.");
      } catch (IOException e) {
        LOG.warn("Failed to read local file " + localFileName + " because:", e);
      } finally {
        closer.close();
      }
    }


    mTachyonFS.unlockBlock(blockId, blockLockId);
    return null;

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        this.baseCommand = constructBaseCommand();
    }


    private File extractYSlow() throws IOException {
        File yslow = File.createTempFile("yslow", ".js");
        Closer closer = Closer.create();
        try {


            InputStream in = this.getClass().getClassLoader()
                    .getResourceAsStream(YSLOW);
            OutputStream out = new FileOutputStream(yslow);
            closer.register(in);
            closer.register(out);
            IOUtils.copy(in, out);
        } catch (Throwable t) {
            closer.rethrow(t);
        } finally {
            closer.close();
        }
        yslow.deleteOnExit();
        return yslow;
    }

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  /**
   * Create a temporary ANT file for executing JUnit4 ANT task.
   */
  private File createTemporaryAntFile(Document doc) throws IOException {
    Closer closer = Closer.create();
    try {
      File antFile = File.createTempFile("junit4-ant-", ".xml", dir);
      OutputStream os = closer.register(new FileOutputStream(antFile));
      XMLWriter xmlWriter = new XMLWriter(os, OutputFormat.createPrettyPrint());
      xmlWriter.write(doc);
      return antFile;
    } catch (Throwable t) {
      throw closer.rethrow(t);
    } finally {
      closer.close();
    }
  }

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            targetWork.mkdirs();
        }


        getLog().debug("Resolved target artifact to " + artifactFile.toString());


        Closer closer = Closer.create();


        Container container = new Container(artifactFile.getName());


        try {
            ZipInputStream zis = closer.register(new ZipInputStream(new BufferedInputStream(new FileInputStream(artifactFile))));




            getLog().info("Extracting " + artifactFile + " to " + targetWork);
            ZipFileIteratorAndExtractor iterator = new ZipFileIteratorAndExtractor(container, zis, targetWork);
            iterator.extract();


            getLog().info("Retrieving Properties");
            Properties properties = getProperties();


            getLog().info("Processing Files");
            TemplateProcessor processor = new TemplateProcessor(properties, tokenStart, tokenEnd, getLog());
            FileTemplating.processFiles(targetWork, processor);


            getLog().info("Compressing to " + finalFile);
            ZipOutputStream zos = closer.register(new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(finalFile))));
            ZipFileCompressor compressor = new ZipFileCompressor(container, zos, targetWork);
            compressor.compress();


            getLog().info("Done.");
        } catch (IOException e) {
            getLog().error(e);
            throw new MojoExecutionException(e.getMessage(), e);
        } finally {
            try {
                closer.close();
            } catch (IOException e) {
                throw new MojoExecutionException(e.getMessage(), e);
            }
        }
    }

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        properties.putAll(System.getProperties());
        properties.putAll(project.getProperties());


        if (propertySources != null) {


            Closer closer = Closer.create();
            try {
                for (String propertySource : propertySources) {
                    loadPropertySource(properties, closer, propertySource);
                }
            } finally {
                closer.close();
            }
        }
        return properties;
    }

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