/*
 * Copyright (C) 2006-2013 Bitronix Software (http://www.bitronix.be)
 *
 * 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 bitronix.tm.timer;

import bitronix.tm.recovery.Recoverer;
import bitronix.tm.utils.MonotonicClock;
import junit.framework.TestCase;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;


/**
 *
 * @author Ludovic Orban
 */
public class TaskSchedulerTest extends TestCase {

    private TaskScheduler ts;

    @Override
    protected void setUp() throws Exception {
        ts = new TaskScheduler();
        ts.start();
    }

    @Override
    protected void tearDown() throws Exception {
        assertEquals(0, ts.countTasksQueued());
        ts.shutdown();
    }


    public void testRecoveryTask() throws Exception {
        Recoverer recoverer = new Recoverer();
        ts.scheduleRecovery(recoverer, new Date());
        assertEquals(1, ts.countTasksQueued());
        Thread.sleep(1100);
        assertEquals(1, ts.countTasksQueued());

        ts.cancelRecovery(recoverer);
        assertEquals(0, ts.countTasksQueued());
        Thread.sleep(1100);
        assertEquals(0, ts.countTasksQueued());
    }

    public void testTaskOrdering() throws Exception {
        List<SimpleTask> result = Collections.synchronizedList(new ArrayList<SimpleTask>());

        ts.addTask(new SimpleTask(new Date(MonotonicClock.currentTimeMillis() + 100), ts, 0, result));
        ts.addTask(new SimpleTask(new Date(MonotonicClock.currentTimeMillis() + 200), ts, 1, result));
        ts.addTask(new SimpleTask(new Date(MonotonicClock.currentTimeMillis() + 300), ts, 2, result));

        ts.join(1000);

        assertEquals(0, result.get(0).getObject());
        assertEquals(1, result.get(1).getObject());
        assertEquals(2, result.get(2).getObject());
    }

    public void testIdenticalScheduleTimestamp() throws Exception {
        List<SimpleTask> result = Collections.synchronizedList(new ArrayList<SimpleTask>());

        long firstTimestamp = MonotonicClock.currentTimeMillis();
        long secondTimestamp = MonotonicClock.currentTimeMillis() + 200;

        ts.addTask(new SimpleTask(new Date(firstTimestamp), ts, 0, result));

        ts.addTask(new SimpleTask(new Date(secondTimestamp), ts, 1, result));
        ts.addTask(new SimpleTask(new Date(secondTimestamp), ts, 2, result));

        assertEquals("Three tasks were created.  All 3 (even identical timestamps) should be queued",
                3, ts.countTasksQueued());

        ts.join(1000);
    }

    private static class SimpleTask extends Task {

        private final Object obj;
        private final List<SimpleTask> result;

        protected SimpleTask(Date executionTime, TaskScheduler scheduler, Object obj, List<SimpleTask> result) {
            super(executionTime, scheduler);
            this.obj = obj;
            this.result = result;
        }

        @Override
        public Object getObject() {
            return obj;
        }

        @Override
        public void execute() throws TaskException {
            result.add(this);
        }
    }

}