pulsar-broker/src/test/java/com/yahoo/pulsar/broker/stats/BookieClientsStatsGeneratorTest.java

/**
 * Copyright 2016 Yahoo Inc.
 *
 * 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.yahoo.pulsar.broker.stats;

import static org.testng.Assert.assertEquals;

import java.util.Map;

import org.apache.bookkeeper.mledger.proto.PendingBookieOpsStats;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

import com.yahoo.pulsar.broker.service.BrokerTestBase;
import com.yahoo.pulsar.broker.stats.BookieClientStatsGenerator;
import com.yahoo.pulsar.broker.stats.metrics.JvmMetrics;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.PooledByteBufAllocator;

/**
 */
public class BookieClientsStatsGeneratorTest extends BrokerTestBase {

    @BeforeClass
    @Override
    protected void setup() throws Exception {
        super.baseSetup();
    }

    @AfterClass
    @Override
    protected void cleanup() throws Exception {
        super.internalCleanup();
    }

    @Test
    public void testBookieClientStatsGenerator() throws Exception {
        // should not generate any NPE or other exceptions..
        Map<String, Map<String, PendingBookieOpsStats>> stats = BookieClientStatsGenerator.generate(super.getPulsar());
        assertEquals((boolean) stats.isEmpty(), true);
    }
    
    @Test
    public void testJvmDirectMemoryUsedMetric() throws Exception {
        PooledByteBufAllocator allocator = new PooledByteBufAllocator( //
                true, // preferDirect
                0, // nHeapArenas,
                1, // nDirectArena
                8192, // pageSize
                11, // maxOrder
                64, // tinyCacheSize
                32, // smallCacheSize
                8 // normalCacheSize
        );
        int allocateMemory = 17777216;
        long directMemory1 = JvmMetrics.getJvmDirectMemoryUsed();
        ByteBuf buf2 = allocator.directBuffer(allocateMemory, allocateMemory);
        long directMemory2 = JvmMetrics.getJvmDirectMemoryUsed();
        assertEquals(directMemory2, directMemory1 + allocateMemory);
        ByteBuf buf3 = allocator.directBuffer(allocateMemory, allocateMemory);
        long directMemory3 = JvmMetrics.getJvmDirectMemoryUsed();
        assertEquals(directMemory3, directMemory2 + allocateMemory);
        buf3.release();
        directMemory3 = JvmMetrics.getJvmDirectMemoryUsed();
        assertEquals(directMemory3, directMemory2);
        buf2.release();
        directMemory2 = JvmMetrics.getJvmDirectMemoryUsed();
        assertEquals(directMemory2, directMemory1);
        
    }
}