/*
* 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.wicketstuff.progressbar.spring;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Executor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.wicketstuff.progressbar.Progression;
import org.wicketstuff.progressbar.spring.Task.Message;
/**
* <p>
* Should be registered as SESSION scoped bean to prevent memory leaks with unfinished tasks.
* </p>
*
* TODO automatic cleanup of tasks
*
* @author Christopher Hlubek (hlubek)
*
*/
public class TaskService implements ITaskService
{
private static final Logger LOGGER = LoggerFactory.getLogger(TaskService.class);
private final Executor executor;
public TaskService(Executor executor)
{
this.executor = executor;
}
private Map<Long, Task> tasks = new HashMap<Long, Task>();
private long nextTaskId = 0;
public synchronized Long schedule(Task task)
{
Long taskId = nextTaskId();
LOGGER.debug("Scheduling task with ID: " + taskId);
tasks.put(taskId, task);
return taskId;
}
public void start(Long taskId)
{
Task task = getTask(taskId);
if (task != null)
{
LOGGER.debug("Starting task with ID: " + taskId);
start(task);
}
else
{
LOGGER.warn("Task ID " + taskId + " not found");
}
}
public void cancel(Long taskId)
{
Task task = getTask(taskId);
if (task != null)
{
task.cancel();
}
}
private void start(Task task)
{
executor.execute(task.getRunnable());
}
Task getTask(Long taskId)
{
return tasks.get(taskId);
}
private synchronized long nextTaskId()
{
return nextTaskId++;
}
public Long scheduleAndStart(Task task)
{
Long taskId = schedule(task);
start(task);
return taskId;
}
public void finish(Long taskId)
{
tasks.remove(taskId);
}
public Progression getProgression(Long taskId)
{
Task task = getTask(taskId);
// HACK Need real finished setting in Progression
// FIXME we really don't know if task is null!
return (task == null || task.isDone()) ? new Progression(100) : new Progression(
task.getProgress());
}
public List<Message> getMessages(Long taskId)
{
Task task = getTask(taskId);
// FIXME clone messages to prevent direct reference to task!
return task.getMessages();
}
}