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   * Copyright 2010-2015, 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
  * or in the "license" file accompanying this file. This file is distributed
  * express or implied. See the License for the specific language governing
  * permissions and limitations under the License.
 package com.amazonaws.event;
Listener interface for transfer progress events.

This class could be used for both Amazon S3 and Amazon Glacier clients. The legacy Amazon S3 progress listener has been deprecated in favor of this new class.

See also:
 public interface ProgressListener {
     public static final ProgressListener NOOP = new ProgressListener() {
         @Override public void progressChanged(ProgressEvent progressEvent) {}

Called when progress has changed, such as additional bytes transferred, transfer failed, etc. The execution of the callback of this listener is managed by SDKProgressPublisher. Implementation of this interface should never block.

If the implementation follows the best practice and doesn't block, it should then extends from SyncProgressListener.

Note any exception thrown by the listener will get ignored. Should there be need to capture any such exception, you may consider wrapping the listener with ProgressListener.ExceptionReporter.wrap(com.amazonaws.event.ProgressListener).

progressEvent The event describing the progress change.
See also:
     public void progressChanged(ProgressEvent progressEvent);

A utility class for capturing and reporting the first exception thrown by a given progress listener. Note once an exception is thrown by the underlying listener, all subsequent events will no longer be notified to the listener.
     public static class ExceptionReporter implements ProgressListenerDeliveryMode {
         private final ProgressListener listener;
         private final boolean syncCallSafe;
         private volatile Throwable cause;
         public ExceptionReporter(ProgressListener listener) {
             if (listener == null)
                 throw new IllegalArgumentException();
             this. = listener;
             if (listener instanceof DeliveryMode) {
                 DeliveryMode cs = (DeliveryModelistener;
                  = cs.isSyncCallSafe();
             } else
                  = false;

Delivers the progress event to the underlying listener but only if there has not been an exception previously thrown by the listener.

         @Override public void progressChanged(ProgressEvent progressEvent) {
             if ( != null)
             try {
             } catch(Throwable t) {
                  = t;

Throws the underlying exception, if any, as an com.amazonaws.AmazonClientException; or do nothing otherwise.
         public void throwExceptionIfAny() {
             if ( != null)
                throw new AmazonClientException();

Returns the underlying exception, if any; or null otherwise.
        public Throwable getCause() {
            return ;

Returns a wrapper for the given listener to capture the first exception thrown.
        public static ExceptionReporter wrap(ProgressListener listener) {
            return new ExceptionReporter(listener);
        @Override public boolean isSyncCallSafe() { return ; }
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