io.kahu.hawaii.util.call.dispatch.HawaiiRejectedExecutionHandler.java Source code

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Here is the source code for io.kahu.hawaii.util.call.dispatch.HawaiiRejectedExecutionHandler.java

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/**
 * Copyright 2015 Q24
 *
 * 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 io.kahu.hawaii.util.call.dispatch;

import io.kahu.hawaii.util.logger.CoreLoggers;
import io.kahu.hawaii.util.logger.LogManager;
import org.apache.http.annotation.ThreadSafe;

import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;

@ThreadSafe
public class HawaiiRejectedExecutionHandler implements RejectedExecutionHandler {
    private final LogManager logManager;
    private final RejectedExecutionHandler delegate;

    public HawaiiRejectedExecutionHandler(LogManager logManager, RejectedExecutionHandler delegate) {
        this.logManager = logManager;
        this.delegate = delegate;
    }

    @Override
    public void rejectedExecution(Runnable task, ThreadPoolExecutor executor) {
        /*
         * This does the actual put into the queue. Once the max threads have
         * been reached, the tasks will then queue up.
         */
        try {
            executor.getQueue().add(task);
        } catch (IllegalStateException e) {
            try {
                ((HawaiiExecutorImpl) executor).rejectTask();
                if (delegate != null) {
                    delegate.rejectedExecution(task, executor);
                }
            } finally {
                logManager.info(CoreLoggers.SERVER,
                        "Rejected '" + task + "' since the pool and queue size has been exceeded.");
                throw new RejectedExecutionException();
            }

        }
    }

}