Examples of JCS

org.apache.jcs.JCS
Simple class for using JCS. To use JCS in your application, you can use the static methods of this class to get access objects (instances of this class) for your cache regions. Ideally this class should be all you need to import to use JCS. One JCS should be created for each region you want to access. If you have several regions, then get instances for each. For best performance the getInstance call should be made in an initialization method. @author Aaron Smuts @author James Taylor @version $Id: JCS.java,v 1.5 2002/05/23 15:22:22 jtaylor Exp $
org.apache.stratum.jcs.JCS
Simple class for using JCS. To use JCS in your application, you can use the static methods of this class to get access objects (instances of this class) for your cache regions. Ideally this class should be all you need to import to use JCS. One JCS should be created for each region you want to access. If you have several regions, then get instances for each. For best performance the getInstance call should be made in an initialization method. @author Aaron Smuts @author James Taylor @created February 13, 2002 @version $Id: JCS.java,v 1.8 2002/02/18 17:14:24 asmuts Exp $

Examples of org.apache.jcs.JCS

    public void testSpoolNotAllowedEventOnItem()
        throws Exception
    {
        MyEventHandler meh = new MyEventHandler();


        JCS jcs = JCS.getInstance( "DiskButNotAllowed" );
        // this should add the event handler to all items as they are created.
        //IElementAttributes attributes = jcs.getDefaultElementAttributes();
        //attributes.addElementEventHandler( meh );
        //jcs.setDefaultElementAttributes( attributes );


        // put them in
        for ( int i = 0; i <= items; i++ )
        {
            IElementAttributes attributes = jcs.getDefaultElementAttributes();
            attributes.addElementEventHandler( meh );
            jcs.put( i + ":key", "data" + i, attributes );
        }


        // wait a bit for it to finish
        Thread.sleep( items / 20 );

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Examples of org.apache.jcs.JCS

     * @exception Exception If an error occurs
     */
    public void runTestForRegion( String region )
        throws Exception
    {
        JCS jcs = JCS.getInstance( region );


        // Add items to cache


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


        System.out.println( jcs.getStats() );


        // Thread.sleep( 1000 );


        // System.out.println( jcs.getStats() );


        // Test that all items are in cache


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


            assertEquals( "key = [" + i + ":key] value = [" + value + "]", region + " data " + i, value );
        }


        // 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", jcs.get( i + ":key" ) );
        }
    }

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Examples of org.apache.jcs.JCS

    {
        int items = 20;


        String region = "testBasicPutRemove";


        JCS jcs = JCS.getInstance( region );


        // Add items to cache


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


        //SleepUtil.sleepAtLeast( 1000 );


        System.out.println( jcs.getStats() );


        // Test that all items are in cache


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


            assertEquals( "key = [" + i + ":key] value = [" + value + "]", region + " data " + i, value );
        }


        // 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", jcs.get( i + ":key" ) );
        }
    }

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Examples of org.apache.jcs.JCS

     *                If an error occurs
     */
    public void runTestForRegion( String region, int start, int end )
        throws Exception
    {
        JCS jcs = JCS.getInstance( region );


        // Add items to cache


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


        // Test that all items are in cache


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


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


        /*

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Examples of org.apache.jcs.JCS

     */
    public void testRemoveAll()
        throws CacheException, InterruptedException
    {
        String region = "removeAllAllowed";
        JCS jcs = JCS.getInstance( region );


        int items = 20;


        // Add items to cache


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


        // a db thread could be updating when we call remove all?
        // there was a race on remove all, an element may be put to disk after it is called even
        // though the put
        // was called before clear.
        // I discovered it and removed it.
        // Thread.sleep( 500 );


        System.out.println( jcs.getStats() );


        jcs.clear();


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


            assertNull( "value should be null key = [" + i + ":key] value = [" + value + "]", value );
        }
    }

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Examples of org.apache.jcs.JCS

     */
    public void testRemoveAllProhibition()
        throws CacheException, InterruptedException
    {
        String region = "noRemoveAll";
        JCS jcs = JCS.getInstance( region );


        int items = 20;


        // Add items to cache


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


        // a db thread could be updating the disk when
        // Thread.sleep( 500 );


        System.out.println( jcs.getStats() );


        jcs.clear();


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


            assertEquals( "key = [" + i + ":key] value = [" + value + "]", region + " data " + i, value );
        }
    }

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Examples of org.apache.jcs.JCS

        long pauseBetweenRuns = 1000;
        int runCount = 0;
        int runs = 1000;
        int upperKB = 50;


        JCS jcs = JCS.getInstance( ( numPerRun / 2 ) + "aSecond" );


        ElapsedTimer timer = new ElapsedTimer();
        int numToGet = numPerRun * ( runs / 10 );
        for ( int i = 0; i < numToGet; i++ )
        {
            jcs.get( String.valueOf( i ) );
        }
        System.out.println( LOG_DIVIDER );
        System.out.println( "After getting " + numToGet );
        System.out.println( "Elapsed " + timer.getElapsedTimeString() );
        logMemoryUsage();


        jcs.clear();
        Thread.sleep( 3000 );
        System.out.println( LOG_DIVIDER );
        System.out.println( "Start putting" );


        long totalSize = 0;
        int totalPut = 0;


        Random random = new Random( 89 );
        while ( runCount < runs )
        {
            runCount++;
            for ( int i = 0; i < numPerRun; i++ )
            {
                // 1/2 upper to upperKB-4 KB
                int kiloBytes = Math.max( upperKB / 2, random.nextInt( upperKB ) );
                int bytes = ( kiloBytes ) * 1024;
                totalSize += bytes;
                totalPut++;
                DiskTestObject object = new DiskTestObject( new Integer( i ), new byte[bytes] );
                jcs.put( String.valueOf( totalPut ), object );
            }


            // remove half of those inserted the previous run
            if ( runCount > 1 )
            {
                for ( int j = ( ( totalPut - numPerRun ) - ( numPerRun / 2 ) ); j < ( totalPut - numPerRun ); j++ )
                {
                    jcs.remove( String.valueOf( j ) );
                }
            }


            Thread.sleep( pauseBetweenRuns );
            if ( runCount % 1 == 0 )
            {
                System.out.println( LOG_DIVIDER );
                System.out.println( "Elapsed " + timer.getElapsedTimeString() );
                System.out.println( "Run count: " + runCount + " Average size: " + ( totalSize / totalPut ) + "\n"
                    + jcs.getStats() );
                logMemoryUsage();
            }
        }


        Thread.sleep( 3000 );
        System.out.println( jcs.getStats() );
        logMemoryUsage();


        Thread.sleep( 10000 );
        System.out.println( jcs.getStats() );
        logMemoryUsage();


        System.gc();
        Thread.sleep( 3000 );
        System.gc();
        System.out.println( jcs.getStats() );
        logMemoryUsage();
    }

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Examples of org.apache.jcs.JCS

        throws CacheException, InterruptedException
    {
        String region = "eternal";
        int items = 200;


        JCS jcs = JCS.getInstance( region );


        System.out.println( "BEFORE PUT \n" + jcs.getStats() );


        // Add items to cache


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


        System.out.println( jcs.getStats() );


        SleepUtil.sleepAtLeast( 1000 );


        System.out.println( jcs.getStats() );


        // Test that all items are in cache


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


            assertEquals( "key = [" + i + ":key] value = [" + value + "]", region + " data " + i, value );
        }


        // 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", jcs.get( i + ":key" ) );
        }
    }

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Examples of org.apache.jcs.JCS

     *                If an error occurs
     */
    public void runTestForRegion( String region, int items )
        throws Exception
    {
        JCS jcs = JCS.getInstance( region );


        System.out.println( "BEFORE PUT \n" + jcs.getStats() );


        // Add items to cache


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


        System.out.println( jcs.getStats() );


        Thread.sleep( 1000 );


        System.out.println( jcs.getStats() );


        // Test that all items are in cache


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


            assertEquals( "key = [" + i + ":key] value = [" + value + "]", region + " data " + i, value );
        }


        // 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", jcs.get( i + ":key" ) );
        }
    }

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Examples of org.apache.jcs.JCS


        try
        {


            JCS.setConfigFilename( "/TestMRUCache.ccf" );
            JCS cache = JCS.getInstance( "lruDefined" );
            JCS mru = JCS.getInstance( "mruDefined" );


            System.out.println( "LRU = " + cache );


            for ( int j = 0; j < loops; j++ )
            {


                System.out.println( "Beginning loop " + j );


                String name = "LRU      ";
                start = System.currentTimeMillis();
                for ( int i = 0; i < tries; i++ )
                {
                    cache.put( "key:" + i, "data" + i );
                }
                end = System.currentTimeMillis();
                time = end - start;
                putTotalLRU += time;
                tPer = Float.intBitsToFloat( (int) time ) / Float.intBitsToFloat( tries );
                System.out.println( name + " put time for " + tries + " = " + time + "; millis per = " + tPer );


                start = System.currentTimeMillis();
                for ( int i = 0; i < tries; i++ )
                {
                    cache.get( "key:" + i );
                }
                end = System.currentTimeMillis();
                time = end - start;
                getTotalLRU += time;
                tPer = Float.intBitsToFloat( (int) time ) / Float.intBitsToFloat( tries );
                System.out.println( name + " get time for " + tries + " = " + time + "; millis per = " + tPer );


                // /////////////////////////////////////////////////////////////
                name = "MRU";
                start = System.currentTimeMillis();
                for ( int i = 0; i < tries; i++ )
                {
                    mru.put( "key:" + i, "data" + i );
                }
                end = System.currentTimeMillis();
                time = end - start;
                putTotalMRU += time;
                tPer = Float.intBitsToFloat( (int) time ) / Float.intBitsToFloat( tries );
                System.out.println( name + " put time for " + tries + " = " + time + "; millis per = " + tPer );


                start = System.currentTimeMillis();
                for ( int i = 0; i < tries; i++ )
                {
                    mru.get( "key:" + i );
                }
                end = System.currentTimeMillis();
                time = end - start;
                getTotalMRU += time;
                tPer = Float.intBitsToFloat( (int) time ) / Float.intBitsToFloat( tries );

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