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AsyncTaskManagerServiceImpl.java
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/
AsyncTaskManagerServiceImpl.java
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/*
* Copyright 2013, Red Hat, Inc. and individual contributors as indicated by the
* @author tags. See the copyright.txt file in the distribution for a full
* listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This software is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this software; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA, or see the FSF
* site: http://www.fsf.org.
*/
package org.zanata.service.impl;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.collect.Maps;
import org.jboss.seam.Component;
import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.annotations.Startup;
import org.zanata.async.AsyncTaskHandle;
import org.zanata.async.AsyncTask;
import org.zanata.async.TaskExecutor;
import org.zanata.service.AsyncTaskManagerService;
import java.io.Serializable;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.TimeUnit;
/**
* Default Implementation of an Asynchronous task manager service.
*
* This replaces the now deprecated ProcessManagerService.
*
* @author Carlos Munoz <a href="mailto:camunoz@redhat.com">camunoz@redhat.com</a>
*/
@Name("asyncTaskManagerServiceImpl")
@Scope(ScopeType.APPLICATION)
@Startup
public class AsyncTaskManagerServiceImpl implements AsyncTaskManagerService
{
// Collection of all managed task Handles. It's self pruned, and it is indexed by
// long valued keys
private Cache<Long, AsyncTaskHandle> handlesById =
CacheBuilder.newBuilder()
.softValues()
.expireAfterWrite(1, TimeUnit.HOURS)
.build();
private ConcurrentMap<Serializable, AsyncTaskHandle> handlesByKey =
Maps.newConcurrentMap();
private long lastAssignedKey = 1;
@Override
public <V, H extends AsyncTaskHandle<V>> String startTask(AsyncTask<V, H> task)
{
TaskExecutor taskExecutor = (TaskExecutor) Component.getInstance(TaskExecutor.class);
AsyncTaskHandle<V> handle = taskExecutor.startTask(task);
Long taskKey;
taskKey = generateNextAvailableKey();
handlesById.put(taskKey, handle);
return taskKey.toString();
}
@Override
public <V, H extends AsyncTaskHandle<V>> void startTask(AsyncTask<V, H> task, Serializable key)
{
String taskId = startTask(task);
handlesByKey.put(key, getHandle(taskId));
}
@Override
public AsyncTaskHandle getHandle(String taskId)
{
try
{
Long taskKey = Long.parseLong(taskId);
AsyncTaskHandle handle = handlesById.getIfPresent(taskKey);
return handle;
}
catch (NumberFormatException e)
{
return null; // Non-number keys are not allowed in this implementation
}
}
@Override
public AsyncTaskHandle getHandleByKey(Serializable key)
{
return handlesByKey.get(key);
}
@Override
public void clearInactive()
{
synchronized (handlesById)
{
for (Map.Entry<Long, AsyncTaskHandle> entry : handlesById.asMap().entrySet())
{
if( entry.getValue().isDone() )
{
handlesById.invalidate(entry.getKey());
}
}
}
}
@Override
public Collection<AsyncTaskHandle> getAllHandles()
{
return handlesById.asMap().values();
}
private synchronized long generateNextAvailableKey()
{
return lastAssignedKey++;
}
}