/**
 * Copyright (c) 2004-2011 QOS.ch
 * All rights reserved.
 *
 * Permission is hereby granted, free  of charge, to any person obtaining
 * a  copy  of this  software  and  associated  documentation files  (the
 * "Software"), to  deal in  the Software without  restriction, including
 * without limitation  the rights to  use, copy, modify,  merge, publish,
 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 *
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 *
 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
package org.slf4j.impl;

import static org.junit.Assert.assertEquals;

import java.util.List;
import java.util.Random;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.atomic.AtomicLong;

import org.apache.log4j.LogManager;
import org.apache.log4j.spi.LoggingEvent;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerAccessingThread;
import org.slf4j.LoggerFactory;

public class Log4j12MultithreadedInitializationTest {

    // value of LogManager.DEFAULT_CONFIGURATION_KEY;
    static String CONFIG_FILE_KEY = "log4j.configuration";

    final static int THREAD_COUNT = 4 + Runtime.getRuntime().availableProcessors() * 2;

    private final  AtomicLong eventCount = new AtomicLong(0);

    private final CyclicBarrier barrier = new CyclicBarrier(THREAD_COUNT + 1);

    final int diff = new Random().nextInt(10000);
    final String loggerName = this.getClass().getName();

    @Before
    public void setup() {
      System.out.println("THREAD_COUNT=" + THREAD_COUNT);
    }

    @After
    public void tearDown() throws Exception {
        System.clearProperty(CONFIG_FILE_KEY);
    }

    @Test
    public void multiThreadedInitialization() throws InterruptedException, BrokenBarrierException {
    
        System.setProperty(CONFIG_FILE_KEY, "recursiveInitWithActivationDelay.properties");
        
        @SuppressWarnings("unused")
        LoggerAccessingThread[] accessors = harness();

        Logger logger = LoggerFactory.getLogger(loggerName + ".slowInitialization-" + diff);
        logger.info("hello");
        eventCount.getAndIncrement();

        List<LoggingEvent> events = getRecordedEvents();
        int NUM_LINES_BY_RECURSIVE_APPENDER = 3;
        assertEquals(eventCount.get() + NUM_LINES_BY_RECURSIVE_APPENDER, events.size());
    }

    private List<LoggingEvent> getRecordedEvents() {
        org.apache.log4j.Logger root = LogManager.getRootLogger();

        RecursiveAppender ra = (RecursiveAppender) root.getAppender("RECURSIVE");
        return ra.events;
    }

    private LoggerAccessingThread[] harness() throws InterruptedException, BrokenBarrierException {
        LoggerAccessingThread[] threads = new LoggerAccessingThread[THREAD_COUNT];
        for (int i = 0; i < THREAD_COUNT; i++) {
            threads[i] = new LoggerAccessingThread(barrier, i, eventCount);
            threads[i].start();
        }

        barrier.await();
        for (int i = 0; i < THREAD_COUNT; i++) {
            threads[i].join();
        }
        return threads;
    }

}