/*
 * 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;

import com.alibaba.druid.util.JdbcUtils;
import com.alibaba.druid.util.Utils;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.lang.management.ManagementFactory;

import javax.management.MBeanServer;
import javax.management.ObjectName;

public class TestUtil {
    public static long getYoungGC() {
        try {
            MBeanServer mbeanServer = ManagementFactory.getPlatformMBeanServer();
            ObjectName objectName;
            if (mbeanServer.isRegistered(new ObjectName("java.lang:type=GarbageCollector,name=ParNew"))) {
                objectName = new ObjectName("java.lang:type=GarbageCollector,name=ParNew");
            } else if (mbeanServer.isRegistered(new ObjectName("java.lang:type=GarbageCollector,name=Copy"))) {
                objectName = new ObjectName("java.lang:type=GarbageCollector,name=Copy");
            } else {
                objectName = new ObjectName("java.lang:type=GarbageCollector,name=PS Scavenge");
            }

            return (Long) mbeanServer.getAttribute(objectName, "CollectionCount");
        } catch (Exception e) {
            throw new RuntimeException("error");
        }
    }

    public static long getFullGC() {
        try {
            MBeanServer mbeanServer = ManagementFactory.getPlatformMBeanServer();
            ObjectName objectName;

            if (mbeanServer.isRegistered(new ObjectName("java.lang:type=GarbageCollector,name=ConcurrentMarkSweep"))) {
                objectName = new ObjectName("java.lang:type=GarbageCollector,name=ConcurrentMarkSweep");
            } else if (mbeanServer.isRegistered(new ObjectName("java.lang:type=GarbageCollector,name=MarkSweepCompact"))) {
                objectName = new ObjectName("java.lang:type=GarbageCollector,name=MarkSweepCompact");
            } else {
                objectName = new ObjectName("java.lang:type=GarbageCollector,name=PS MarkSweep");
            }

            return (Long) mbeanServer.getAttribute(objectName, "CollectionCount");
        } catch (Exception e) {
            throw new RuntimeException("error");
        }
    }

    public static String getResource(String path) {
        ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
        try (Reader reader = new InputStreamReader(
                contextClassLoader
                        .getResourceAsStream(path), "UTF-8")
        ) {
            return Utils.read(reader);
        } catch (IOException ignored) {
            return null;
        }
    }
}
