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The AWS Java SDK for Amazon S3 module holds the client classes that are used for communicating with Amazon Simple Storage Service

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/*
 * Copyright 2013-2024 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.internal;

import com.amazonaws.event.DeliveryMode;
import com.amazonaws.event.ProgressListener;
import com.amazonaws.event.SDKProgressPublisher;
import com.amazonaws.services.s3.transfer.PersistableTransfer;

import org.apache.commons.logging.LogFactory;

import java.util.concurrent.Future;

/**
 * Used to publish transfer events.
 */
public class S3ProgressPublisher extends SDKProgressPublisher {
    /**
     * Used to deliver a persistable transfer to the given s3 listener.
     *
     * @param listener only listener of type {@link S3ProgressListener} will be
     * notified.
     *
     * @return the future of a submitted task; or null if the delivery is
     * synchronous with no future task involved.  Note a listener should never
     * block, and therefore returning null is the typical case.
     */
    public static Future publishTransferPersistable(
            final ProgressListener listener,
            final PersistableTransfer persistableTransfer) {
        if (persistableTransfer == null || !(listener instanceof S3ProgressListener)) {
            return null;
        }
        final S3ProgressListener s3listener = (S3ProgressListener)listener;
        return deliverEvent(s3listener, persistableTransfer);
    }

    private static Future deliverEvent(final S3ProgressListener listener,
            final PersistableTransfer persistableTransfer) {
        if (listener instanceof DeliveryMode) {
            DeliveryMode mode = (DeliveryMode) listener;
            if (mode.isSyncCallSafe()) {
                // Safe to call the listener directly
                return quietlyCallListener(listener, persistableTransfer);
            }
        }

        // Not safe to call the listener directly; so submit an async task.
        // This is unfortunate as the listener should never block in the first
        // place, but such task submission is necessary to remain backward
        // compatible.
        return setLatestFutureTask(getExecutorService().submit(new Runnable() {
            @Override public void run() {
                listener.onPersistableTransfer(persistableTransfer);
            }
        }));
    }

    private static Future quietlyCallListener(
            final S3ProgressListener listener,
            final PersistableTransfer persistableTransfer) {
        try {
            listener.onPersistableTransfer(persistableTransfer);
        } catch(Throwable t) {
            // That's right, we need to suppress all errors so as to be on par
            // with the async mode where all failures will be ignored.
            LogFactory.getLog(S3ProgressPublisher.class)
                .debug("Failure from the event listener", t);
        }
        return null;
    }
}