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package net.sourceforge.cruisecontrol.util.threadpool;

import java.util.ArrayList;
import java.util.List;

import junit.framework.TestCase;

/**
 * @author Jared Richardson <p/> JUnit test class to work on
 *         net.sourceforge.cruisecontrol.util.ThreadQueue
 */
public class ThreadQueueTest extends TestCase {
    private static final String TIMING_SENSITIVE_MESSAGE = "This is timing sensitive, please run it several times"
            + " before reporting it";
    private static final String TASK_NAME = "TASK:";
    private static final int TASK_COUNT = 5;
    private static final int TENTH_OF_SECOND = 100;
    private List<WorkerThread> tasks;

    protected void setUp() throws Exception {
        tasks = new ArrayList<WorkerThread>();
        for (int i = 1; i < TASK_COUNT + 1; i++) {
            final String taskName = TASK_NAME + i;

            IdleThreadQueueClient task = new IdleThreadQueueClient(taskName);
            ThreadQueue.addTask(task);
            tasks.add(task);
        }
    }

    protected void tearDown() {
        ThreadQueue.stopQueue();
        tasks = null;
    }

    public void testExecution() {
        for (int i = 1; i < TASK_COUNT + 1; i++) {
            String taskName = TASK_NAME + i;
            String message = TIMING_SENSITIVE_MESSAGE + " Failure: " + taskName + " not active.";
            assertTrue(message, ThreadQueue.isActive(taskName));
        }

        // now let them all finish
        boolean allFinished = false;
        int loops = 0;
        while (!allFinished && loops < 10) {
            sleep(10 * TENTH_OF_SECOND);
            boolean anyActive = false;
            for (int i = 1; i < TASK_COUNT + 1 || anyActive; i++) {
                String taskName = TASK_NAME + i;
                if (ThreadQueue.isActive(taskName)) {
                    anyActive = true;
                }
            }
            allFinished = !anyActive;
            loops++;
        }
        
        for (int i = 1; i < TASK_COUNT + 1; i++) {
            String taskName = TASK_NAME + i;
            String message = TIMING_SENSITIVE_MESSAGE + " task " + taskName + " still active.";
            assertFalse(message, ThreadQueue.isActive(taskName));

            IdleThreadQueueClient task = (IdleThreadQueueClient) tasks.get(i - 1);
            assertEquals("DONE WITH " + taskName, task.getResult());
        }
    }

    private static void sleep(int ms) {
        try {
            Thread.sleep(ms);
        } catch (Exception e) {
            // ignored
        }
    }
}