commons-jcs-core/src/test/java/org/apache/commons/jcs3/auxiliary/disk/indexed/HugeQuantityIndDiskCacheLoadTest.java

package org.apache.commons.jcs3.auxiliary.disk.indexed;

import org.apache.commons.jcs3.JCS;
import org.apache.commons.jcs3.access.CacheAccess;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import junit.framework.TestCase;

/**
 * Put a few hundred thousand entries in the disk cache.
 * <p>
 * @author Aaron Smuts
 */
public class HugeQuantityIndDiskCacheLoadTest
    extends TestCase
{
    /** Test setup.  */
    @Override
    public void setUp()
    {
        JCS.setConfigFilename( "/TestDiskCacheHuge.ccf" );
    }

    /**
     * Adds items to cache, gets them, and removes them. The item count is more than the size of the
     * memory cache, so items should spool to disk.
     * <p>
     * @throws Exception If an error occurs
     */
    public void testLargeNumberOfItems()
        throws Exception
    {
        int items = 300000;
        String region = "testCache1";

        CacheAccess<String, String> jcs = JCS.getInstance( region );

        try
        {
            System.out.println( "Start: " + measureMemoryUse() );

            // Add items to cache

            for ( int i = 0; i <= items; i++ )
            {
                jcs.put( i + ":key", region + " data " + i );
            }

            System.out.println( jcs.getStats() );
            System.out.println( "--------------------------" );
            System.out.println( "After put: " + measureMemoryUse() );

            Thread.sleep( 5000 );

            System.out.println( jcs.getStats() );
            System.out.println( "--------------------------" );
            System.out.println( "After wait: " + measureMemoryUse() );

            // Test that all items are in cache

            for ( int i = 0; i <= items; i++ )
            {
                String value = jcs.get( i + ":key" );

                assertEquals( region + " data " + i, value );
            }

            System.out.println( "After get: " + measureMemoryUse() );

            // // Remove all the items
            // for ( int i = 0; i <= items; i++ )
            // {
            // jcs.remove( i + ":key" );
            // }
            //
            // // Verify removal
            // for ( int i = 0; i <= items; i++ )
            // {
            // assertNull( "Removed key should be null: " + i + ":key" + "\n
            // stats " + jcs.getStats(), jcs.get( i + ":key" ) );
            // }

        }
        finally
        {
            // dump the stats to the report
            System.out.println( jcs.getStats() );
            System.out.println( "--------------------------" );
            System.out.println( "End: " + measureMemoryUse() );
        }
    }

    /**
     * Measure memory used by the VM.
     * <p>
     * @return memory used
     * @throws InterruptedException
     */
    protected long measureMemoryUse()
        throws InterruptedException
    {
        System.gc();
        Thread.sleep( 3000 );
        System.gc();
        return Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
    }
}