org.apache.hadoop.util.concurrent.ExecutorHelper.java Source code

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Here is the source code for org.apache.hadoop.util.concurrent.ExecutorHelper.java

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/*
 * *
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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 org.apache.hadoop.util.concurrent;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

/** Helper functions for Executors. */
public final class ExecutorHelper {

    private static final Log LOG = LogFactory.getLog(ExecutorHelper.class);

    static void logThrowableFromAfterExecute(Runnable r, Throwable t) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("afterExecute in thread: " + Thread.currentThread().getName() + ", runnable type: "
                    + r.getClass().getName());
        }

        //For additional information, see: https://docs.oracle
        // .com/javase/7/docs/api/java/util/concurrent/ThreadPoolExecutor
        // .html#afterExecute(java.lang.Runnable,%20java.lang.Throwable) .

        if (t == null && r instanceof Future<?>) {
            try {
                ((Future<?>) r).get();
            } catch (ExecutionException ee) {
                LOG.warn("Execution exception when running task in " + Thread.currentThread().getName());
                t = ee.getCause();
            } catch (InterruptedException ie) {
                LOG.warn("Thread (" + Thread.currentThread() + ") interrupted: ", ie);
                Thread.currentThread().interrupt();
            } catch (Throwable throwable) {
                t = throwable;
            }
        }

        if (t != null) {
            LOG.warn("Caught exception in thread " + Thread.currentThread().getName() + ": ", t);
        }
    }

    private ExecutorHelper() {
    }
}