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The Amazon Kinesis Client Library for Java enables Java developers to easily consume and process data from Amazon Kinesis.

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/*
 * Copyright 2019 Amazon.com, Inc. or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License 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 software.amazon.kinesis.coordinator;

/**
 * An interface to implement behaviors associated with a {@link DiagnosticEvent}. Uses the visitor pattern to visit
 * the DiagnosticEvent when the behavior is desired. A default implementation that performs simple logging is found in
 * {@link DiagnosticEventLogger}.
 */
interface DiagnosticEventHandler {
    /**
     * @param event Log or otherwise react to periodic pulses on the thread pool executor state.
     */
    void visit(ExecutorStateEvent event);

    /**
     * @param event Log or otherwise react to rejected tasks in the RxJavaPlugin layer.
     */
    void visit(RejectedTaskEvent event);
}