/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * 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.alibaba.druid.pvt.pool;

import java.sql.Connection;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.atomic.AtomicInteger;

import org.junit.Assert;
import junit.framework.TestCase;

import com.alibaba.druid.mock.MockDriver;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.stat.DruidDataSourceStatManager;

public class TestIdle3_Concurrent extends TestCase {
    protected void setUp() throws Exception {
        DruidDataSourceStatManager.clear();
    }

    protected void tearDown() throws Exception {
        Assert.assertEquals(0, DruidDataSourceStatManager.getInstance().getDataSourceList().size());
    }

    public void test_idle2() throws Exception {
        MockDriver driver = new MockDriver();

        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setUrl("jdbc:mock:xxx");
        dataSource.setDriver(driver);
        dataSource.setInitialSize(1);
        dataSource.setMaxActive(14);
        dataSource.setMaxIdle(14);
        dataSource.setMinIdle(1);
        dataSource.setMinEvictableIdleTimeMillis(30 * 10); // 300 / 10
        dataSource.setTimeBetweenEvictionRunsMillis(18 * 10); // 180 / 10
        dataSource.setTestWhileIdle(true);
        dataSource.setTestOnBorrow(false);
        dataSource.setValidationQuery("SELECT 1");
        dataSource.setFilters("stat");

        // ManagementFactory.getPlatformMBeanServer().registerMBean(dataSource, new
        // ObjectName("com.alibaba:type=DataSource"));

        // 第一次创建连接
        {
            Assert.assertEquals(0, dataSource.getCreateCount());
            Assert.assertEquals(0, dataSource.getActiveCount());

            Connection conn = dataSource.getConnection();

            Assert.assertEquals(dataSource.getInitialSize(), dataSource.getCreateCount());
            Assert.assertEquals(dataSource.getInitialSize(), driver.getConnections().size());
            Assert.assertEquals(1, dataSource.getActiveCount());

            conn.close();
            Assert.assertEquals(0, dataSource.getDestroyCount());
            Assert.assertEquals(1, driver.getConnections().size());
            Assert.assertEquals(1, dataSource.getCreateCount());
            Assert.assertEquals(0, dataSource.getActiveCount());
        }

        {
            // 并发创建14个
            concurrent(driver, dataSource, 30);
        }

        // 连续打开关闭单个连接
        for (int i = 0; i < 1000; ++i) {
            Assert.assertEquals(0, dataSource.getActiveCount());
            Connection conn = dataSource.getConnection();

            Assert.assertEquals(1, dataSource.getActiveCount());
            conn.close();
        }
        Thread.sleep(1000);
        Assert.assertEquals(1, dataSource.getPoolingCount());

        dataSource.close();
    }

    private void concurrent(final MockDriver driver, final DruidDataSource dataSource, final int count)
            throws Exception {
        final int LOOP_COUNT = 1000;
        Thread[] threads = new Thread[count];
        final CyclicBarrier barrier = new CyclicBarrier(count);
        final CountDownLatch endLatch = new CountDownLatch(count);
        for (int i = 0; i < count; ++i) {
            threads[i] = new Thread("thread-" + i) {
                public void run() {
                    try {
                        for (int i = 0; i < LOOP_COUNT; ++i) {
                            barrier.await();

                            Connection conn = dataSource.getConnection();
                            {
                                AtomicInteger c = new AtomicInteger();
                                for (int j = 0; j < 1000 * 1; ++j) {
                                    c.incrementAndGet();
                                }
                                c.set(0);
                                Thread.sleep(1);
                            }
                            conn.close();
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    } finally {
                        endLatch.countDown();
                    }
                }
            };
        }

        for (int i = 0; i < count; ++i) {
            threads[i].start();
        }

        endLatch.await();
        System.out.println("concurrent end");

        int max = count > dataSource.getMaxActive() ? dataSource.getMaxActive() : count;
        Assert.assertEquals(max, driver.getConnections().size());

    }
}
