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/**
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* Copyright (C) 2015 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.api.service;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.UUID;
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import java.util.concurrent.ConcurrentHashMap;
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import org.springframework.stereotype.Component;
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import eu.etaxonomy.cdm.common.monitor.IRestServiceProgressMonitor;
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/**
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* Manages monitors for long running jobs.
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*
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* @author cmathew
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* @since 14 Oct 2015
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*
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*/
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@Component
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public class ProgressMonitorManager<T extends IRestServiceProgressMonitor> {
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private final Map<UUID, T> monitors = new ConcurrentHashMap<UUID, T>();
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private final Map<UUID, Long> timeoutMap = new HashMap<UUID, Long>();
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private Thread cleanUpThread = null;
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/**
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* Time out in minutes for monitors which are done.
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* A monitor which is set done will be removed after this interval.
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*/
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private final int cleanUpTimeout = 1;
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/**
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*
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*/
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private final int cleanUpInterval = 1000 * 10; // 10 seconds
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public ProgressMonitorManager() {
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this.cleanUpThread = new Thread(){
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@Override
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public void run() {
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while(true){
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scheduledCleanUp();
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try {
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sleep(cleanUpInterval);
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} catch (InterruptedException e) {
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/* IGNORE */
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}
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}
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}
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};
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cleanUpThread.start();
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}
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/**
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* run every n minutes clean up monitors which have been marked done x minutes ago
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*/
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private void scheduledCleanUp() {
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List<UUID> timedOutMonitors = new ArrayList<UUID>();
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IRestServiceProgressMonitor monitor;
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long now = System.currentTimeMillis();
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long nextTimeout = now + cleanUpTimeout * 1000 * 60;
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// add monitors which are stopped or done to the timeoutMap
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for(UUID uuid : monitors.keySet()){
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monitor = monitors.get(uuid);
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if((monitor.isFailed() || monitor.isDone())){
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if(!timeoutMap.containsKey(uuid)){
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timeoutMap.put(uuid, nextTimeout);
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}
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}
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if(monitor.hasFeedbackWaitTimedOut()) {
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monitor.interrupt();
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}
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}
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// check with monitor has timed out
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for(UUID uuid : timeoutMap.keySet()){
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if(timeoutMap.get(uuid) <= now){
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timedOutMonitors.add(uuid);
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}
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}
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//finally remove the monitors
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for(UUID uuid : timedOutMonitors){
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timeoutMap.remove(uuid);
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monitors.remove(uuid);
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}
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}
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public UUID registerMonitor(T monitor){
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UUID uuid = UUID.randomUUID();
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monitors.put(uuid, monitor);
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return uuid;
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}
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public IRestServiceProgressMonitor getMonitor(UUID uuid) {
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if(uuid == null) {
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return null;
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}
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return monitors.get(uuid);
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}
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/**
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* returns true if the {@link IRestServiceProgressMonitor} identified by the <code>uuid</code>
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* exists and if it is still indicating a running thread
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* @param uuid
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* @return
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*/
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public boolean isMonitorRunning(UUID uuid) {
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IRestServiceProgressMonitor monitor = getMonitor(uuid);
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return monitor != null && !monitor.isCanceled() && !monitor.isDone() && !monitor.isFailed();
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}
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public Map<UUID, T> getMonitors() {
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return monitors;
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}
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}
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