/*
 * Copyright 2002-2006,2009 The Apache Software Foundation.
 * 
 * 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 com.opensymphony.xwork2.util.profiling;

import junit.framework.TestCase;

/**
 * @author tmjee
 * @version $Date$ $Id$
 */
public class UtilTimerStackTest extends TestCase {

    protected String activateProp;
    protected String minTimeProp;


    public void testActivateInactivate() throws Exception {
        UtilTimerStack.setActive(true);
        assertTrue(UtilTimerStack.isActive());
        UtilTimerStack.setActive(false);
        assertFalse(UtilTimerStack.isActive());
    }


    public void testPushPop() throws Exception {
        UtilTimerStack.push("p1");
        Thread.sleep(1050);
        ProfilingTimerBean bean = UtilTimerStack.current.get();
        assertTrue(bean.startTime > 0);
        UtilTimerStack.pop("p1");
        assertTrue(bean.totalTime > 1000);
    }


    public void testProfileCallback() throws Exception {

        MockProfilingBlock<String> block = new MockProfilingBlock<String>() {
            @Override
            public String performProfiling() throws Exception {
                Thread.sleep(1050);
                return "OK";
            }
        };
        String result = UtilTimerStack.profile("p1", block);
        assertEquals(result, "OK");
        assertNotNull(block.getProfilingTimerBean());
        assertTrue(block.getProfilingTimerBean().totalTime >= 1000);

    }


    public void testProfileCallbackThrowsException() throws Exception {
        try {
            UtilTimerStack.profile("p1",
                    new UtilTimerStack.ProfilingBlock<String>() {
                        public String doProfiling() throws Exception {
                            throw new RuntimeException("test");
                        }
                    });
            fail("exception should have been thrown");
        }
        catch (Exception e) {
            assertTrue(true);
        }
    }


    @Override
    protected void setUp() throws Exception {
        super.setUp();

        activateProp = System.getProperty(UtilTimerStack.ACTIVATE_PROPERTY);
        minTimeProp = System.getProperty(UtilTimerStack.MIN_TIME);

        System.setProperty(UtilTimerStack.ACTIVATE_PROPERTY, "true");
        UtilTimerStack.setActive(true);
        System.setProperty(UtilTimerStack.MIN_TIME, "0");
    }


    @Override
    protected void tearDown() throws Exception {

        if (activateProp != null) {
            System.setProperty(UtilTimerStack.ACTIVATE_PROPERTY, activateProp);
        } else {
            System.clearProperty(UtilTimerStack.ACTIVATE_PROPERTY);
        }
        if (minTimeProp != null) {
            System.setProperty(UtilTimerStack.MIN_TIME, minTimeProp);
        } else {
            System.clearProperty(UtilTimerStack.ACTIVATE_PROPERTY);
        }


        activateProp = null;
        minTimeProp = null;

        super.tearDown();
    }


    public abstract class MockProfilingBlock<T> implements UtilTimerStack.ProfilingBlock<T> {

        private ProfilingTimerBean bean;

        public T doProfiling() throws Exception {
            bean = UtilTimerStack.current.get();
            return performProfiling();
        }

        public ProfilingTimerBean getProfilingTimerBean() {
            return bean;
        }

        public abstract T performProfiling() throws Exception;
    }
}