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  * Copyright 2014-2015, 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;

Used to indicate whether it is safe to deliver progress events to the listener synchronously. In general, a progress listener should never block, which is a necessary condition for the safety for synchronous delivery.

public interface DeliveryMode {
Returns true if it is safe to make a synchronous callback to the implementing listener without the risk of incurring undue latency; false otherwise.
    public boolean isSyncCallSafe();

Provides convenient method to check if a listener is safe to be invoked synchronously.
    public static class Check {
        public static boolean isSyncCallSafe(ProgressListener listener) {
            if (listener instanceof DeliveryMode) {
                DeliveryMode mode = (DeliveryModelistener;
                return mode.isSyncCallSafe();
            return listener == null;
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