cz.muni.fi.mir.services.TaskServiceImpl.java Source code

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Here is the source code for cz.muni.fi.mir.services.TaskServiceImpl.java

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/* 
 * Copyright 2014 MIR@MU.
 *
 * 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 cz.muni.fi.mir.services;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.core.task.AsyncTaskExecutor;
import org.springframework.stereotype.Component;

import cz.muni.fi.mir.scheduling.ApplicationTask;
import cz.muni.fi.mir.scheduling.TaskStatus;

@Component("taskService")
public class TaskServiceImpl implements TaskService {
    @Autowired
    @Qualifier(value = "taskExecutor")
    private AsyncTaskExecutor taskExecutor;

    private final Map<Future<TaskStatus>, ApplicationTask> entries;
    private static final Logger logger = Logger.getLogger(TaskServiceImpl.class);

    public TaskServiceImpl() {
        entries = new LinkedHashMap<>();
    }

    @Override
    public Future<TaskStatus> submitTask(ApplicationTask task) {
        Future<TaskStatus> future = taskExecutor.submit(task);
        entries.put(future, task);

        return future;
    }

    @Override
    public List<TaskStatus> getTasks() {
        List<TaskStatus> statuses = new ArrayList<>();
        for (Future<TaskStatus> future : entries.keySet()) {
            try {
                if (future.isDone()) {
                    statuses.add(0, future.get());
                } else {
                    statuses.add(0, entries.get(future).getStatus());
                }
            } catch (InterruptedException e) {
                logger.warn("Task was interrupted.", e);
            } catch (ExecutionException e) {
                logger.warn("Task threw exception.", e);
            }
        }
        return statuses;
    }

    @Override
    public void removeFinishedTasks() {
        for (Iterator<Map.Entry<Future<TaskStatus>, ApplicationTask>> it = entries.entrySet().iterator(); it
                .hasNext();) {
            Map.Entry<Future<TaskStatus>, ApplicationTask> entry = it.next();
            if (entry.getKey().isDone() || entry.getKey().isCancelled()) {
                it.remove();
            }
        }
    }
}