edu.unc.lib.dl.cdr.services.FixityLogService.java Source code

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Here is the source code for edu.unc.lib.dl.cdr.services.FixityLogService.java

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/**
 * Copyright 2008 The University of North Carolina at Chapel Hill
 *
 * 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 edu.unc.lib.dl.cdr.services;

import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;

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

import edu.unc.lib.dl.cdr.services.processing.ServiceConductor;
import edu.unc.lib.dl.cdr.services.processing.ServicesThreadPoolExecutor;
import edu.unc.lib.dl.services.FixityLogTask;
import edu.unc.lib.dl.services.FixityLogTaskFactory;

public class FixityLogService implements ServiceConductor {

    private static final Log LOG = LogFactory.getLog(FixityLogService.class);
    private static final String identifier = "FixityLogService";

    protected ServicesThreadPoolExecutor<FixityLogTask> executor = null;
    private FixityLogTaskFactory fixityLogTaskFactory = null;
    private Timer pollingTimer = null;
    private long pollingIntervalSeconds = 60;

    public void init() {
        initializeExecutor();

        pollingTimer = new Timer();
        pollingTimer.schedule(new ExecuteTask(), 0, pollingIntervalSeconds * 1000);
    }

    private void initializeExecutor() {
        this.executor = new ServicesThreadPoolExecutor<FixityLogTask>(1, "FixityLog");
    }

    public void destroy() {
        this.shutdown();
        this.pollingTimer.cancel();
    }

    // Periodically create and execute a new FixityLogTask instance

    class ExecuteTask extends TimerTask {
        public void run() {
            executeFixityLogTask();
        }
    }

    private void executeFixityLogTask() {
        if (!this.executor.isPaused()) {
            LOG.debug("Creating and executing fixity log task");

            FixityLogTask task = this.fixityLogTaskFactory.createTask();
            this.executor.execute(task);
        }
    }

    // Accessors

    public FixityLogTaskFactory getFixityLogTaskFactory() {
        return fixityLogTaskFactory;
    }

    public void setFixityLogTaskFactory(FixityLogTaskFactory fixityLogTaskFactory) {
        this.fixityLogTaskFactory = fixityLogTaskFactory;
    }

    public long getPollingIntervalSeconds() {
        return pollingIntervalSeconds;
    }

    public void setPollingIntervalSeconds(long pollingIntervalSeconds) {
        this.pollingIntervalSeconds = pollingIntervalSeconds;
    }

    // ServiceConductor implementation methods

    @Override
    public String getIdentifier() {
        return identifier;
    }

    @Override
    public void pause() {
        this.executor.pause();
    }

    @Override
    public void resume() {
        this.executor.resume();
    }

    @Override
    public boolean isPaused() {
        return this.executor.isPaused();
    }

    @Override
    public boolean isEmpty() {
        return this.executor.getQueue().isEmpty();
    }

    @Override
    public boolean isIdle() {
        return this.executor.isPaused() || this.executor.getAllRunningAndQueued().isEmpty();
    }

    @Override
    public void shutdown() {
        this.executor.shutdownNow();
    }

    @Override
    public void shutdownNow() {
        this.executor.shutdownNow();
    }

    @Override
    public void abort() {
        this.executor.pause();
        this.executor.shutdownNow();
        try {
            this.executor.awaitTermination(5, TimeUnit.MINUTES);
        } catch (InterruptedException ignored) {
        }
        initializeExecutor();
        this.executor.pause();
    }

    @Override
    public void restart() {
        if (this.executor == null || this.executor.isShutdown() || this.executor.isTerminated())
            initializeExecutor();
    }

    @Override
    public int getActiveThreadCount() {
        return this.executor.getActiveCount();
    }

}