content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.underfs.swift;
  
  import alluxio.util.CommonUtils;
  import alluxio.util.io.PathUtils;
  
  import org.javaswift.joss.model.Account;
  import org.javaswift.joss.model.Container;
  import org.javaswift.joss.model.StoredObject;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.BufferedOutputStream;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.util.List;
  import java.util.UUID;
  import javax.annotation.concurrent.NotThreadSafe;
  
  /**
   * A stream for writing data to an in-memory simulated Swift client. The data will be written to a
   * file in a temporary directory and written out all at once.
   */
  @NotThreadSafe
  public class SwiftMockOutputStream extends OutputStream {
    private static final Logger LOG = LoggerFactory.getLogger(SwiftMockOutputStream.class);
  
    private final File mFile;
  
    private final OutputStream mOutputStream;
  
    private final String mObjectName;
  
    private final Account mAccount;
  
    private final String mContainerName;
  
    /** Flag to indicate if this stream has been closed, to ensure close is only done once. */
    private boolean mClosed = false;
  
    /**
     * Creates a new instance of {@link SwiftMockOutputStream}.
     *
     * @param account simulated Swift account
     * @param containerName container name
     * @param objectName name of file or folder to write
     * @param tmpDirs a list of temporary directories
     */
    public SwiftMockOutputStream(Account account, String containerName, String objectName,
        List<String> tmpDirs)
        throws IOException {
      try {
        mAccount = account;
        mContainerName = containerName;
        mObjectName = objectName;
        mFile = new File(PathUtils.concatPath(CommonUtils.getTmpDir(tmpDirs), UUID.randomUUID()));
        mOutputStream  = new BufferedOutputStream(new FileOutputStream(mFile));
      } catch (Exception e) {
        LOG.error("Failed to construct SwiftMockOutputStream", e);
        throw new IOException(e);
      }
    }
  
    @Override
    public void write(int b) throws IOException {
      mOutputStream.write(b);
    }
  
    @Override
    public void write(byte[] b, int off, int len) throws IOException {
      mOutputStream.write(b, off, len);
    }
  
    @Override
    public void write(byte[] b) throws IOException {
      mOutputStream.write(b);
    }
  
    @Override
    public void close() throws IOException {
      if (mClosed) {
        return;
      }
      mOutputStream.close();
  
      try {
        Container container = mAccount.getContainer(mContainerName);
        StoredObject object = container.getObject(mObjectName);
        object.uploadObject(mFile);
      } catch (Exception e) {
        throw new IOException(e);
      }
      // Close successful
      mClosed = true;
    }
  
    @Override
    public void flush() throws IOException {
      mOutputStream.flush();
    }
  }
  