Commons Collections example source code file (TestBoundedBuffer.java)

This example Commons Collections source code file (TestBoundedBuffer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons Collections tags/keywords

bar, buffer, buffer, bufferoverflowexception, delayediteratorremove, delayedremove, foo, hello, hello, string, unboundedfifobuffer, unboundedfifobuffer, util, world, world

The Commons Collections TestBoundedBuffer.java source code

/*
 *  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.
 */
package org.apache.commons.collections.buffer;

import org.apache.commons.collections.AbstractTestObject;
import org.apache.commons.collections.BoundedCollection;
import org.apache.commons.collections.Buffer;
import org.apache.commons.collections.BufferOverflowException;

import java.util.Iterator;
import java.util.Collections;
import java.util.Arrays;

import junit.framework.Test;
import junit.framework.TestSuite;

public class TestBoundedBuffer extends AbstractTestObject {

    public TestBoundedBuffer(String testName) {
        super(testName);
    }

    public static Test suite() {
        return new TestSuite(TestBoundedBuffer.class);
    }

    public static void main(String args[]) {
        String[] testCaseName = { TestBoundedBuffer.class.getName() };
        junit.textui.TestRunner.main(testCaseName);
    }

    public String getCompatibilityVersion() {
        return "3.2";
    }

    public boolean isEqualsCheckable() {
        return false;
    }

    public Object makeObject() {
        return BoundedBuffer.decorate(new UnboundedFifoBuffer(), 1);
    }

    //-----------------------------------------------------------------------
    public void testMaxSize() {
        final Buffer bounded = BoundedBuffer.decorate(new UnboundedFifoBuffer(), 2, 500);
        BoundedCollection bc = (BoundedCollection) bounded;
        assertEquals(2, bc.maxSize());
        assertEquals(false, bc.isFull());
        bounded.add("A");
        assertEquals(false, bc.isFull());
        bounded.add("B");
        assertEquals(true, bc.isFull());
        bounded.remove();
        assertEquals(false, bc.isFull());
        try {
            BoundedBuffer.decorate(new UnboundedFifoBuffer(), 0);
            fail();
        } catch (IllegalArgumentException ex) {}
        try {
            BoundedBuffer.decorate(new UnboundedFifoBuffer(), -1);
            fail();
        } catch (IllegalArgumentException ex) {}
    }

    public void testAddToFullBufferNoTimeout() {
        final Buffer bounded = BoundedBuffer.decorate(new UnboundedFifoBuffer(), 1);
        bounded.add( "Hello" );
        try {
            bounded.add("World");
            fail();
        } catch (BufferOverflowException e) {
        }
    }

    public void testAddAllToFullBufferNoTimeout() {
        final Buffer bounded = BoundedBuffer.decorate(new UnboundedFifoBuffer(), 1);
        bounded.add( "Hello" );
        try {
            bounded.addAll(Collections.singleton("World"));
            fail();
        } catch (BufferOverflowException e) {
        }
    }

    public void testAddAllToEmptyBufferExceedMaxSizeNoTimeout() {
        final Buffer bounded = BoundedBuffer.decorate(new UnboundedFifoBuffer(), 1);
        try {
            bounded.addAll(Collections.nCopies(2, "test"));
            fail();
        } catch (BufferOverflowException e) {
        }
    }

    public void testAddToFullBufferRemoveViaIterator() {
        final Buffer bounded = BoundedBuffer.decorate(new UnboundedFifoBuffer(), 1, 500);
        bounded.add( "Hello" );
        new DelayedIteratorRemove( bounded, 200 ).start();
        bounded.add( "World" );
        assertEquals( 1, bounded.size() );
        assertEquals( "World", bounded.get() );

    }

    public void testAddAllToFullBufferRemoveViaIterator() {
        final Buffer bounded = BoundedBuffer.decorate(new UnboundedFifoBuffer(), 2, 500);
        bounded.add( "Hello" );
        bounded.add( "World" );
        new DelayedIteratorRemove( bounded, 200, 2 ).start();
        bounded.addAll( Arrays.asList( new String[] { "Foo", "Bar" } ) );
        assertEquals( 2, bounded.size() );
        assertEquals( "Foo", bounded.remove() );
        assertEquals( "Bar", bounded.remove() );
    }

    public void testAddToFullBufferWithTimeout() {
        final Buffer bounded = BoundedBuffer.decorate(new UnboundedFifoBuffer(), 1, 500);
        bounded.add( "Hello" );
        new DelayedRemove( bounded, 200 ).start();
        bounded.add( "World" );
        assertEquals( 1, bounded.size() );
        assertEquals( "World", bounded.get() );
        try {
            bounded.add( "!" );
            fail();
        }
        catch( BufferOverflowException e ) {
        }
    }

    public void testAddAllToFullBufferWithTimeout() {
        final Buffer bounded = BoundedBuffer.decorate(new UnboundedFifoBuffer(), 2, 500);
        bounded.add( "Hello" );
        bounded.add( "World" );
        new DelayedRemove( bounded, 200, 2 ).start();

        bounded.addAll( Arrays.asList( new String[] { "Foo", "Bar" } ) );
        assertEquals( 2, bounded.size() );
        assertEquals( "Foo", bounded.get() );
        try {
            bounded.add( "!" );
            fail();
        }
        catch( BufferOverflowException e ) {
        }
    }

    private class DelayedIteratorRemove extends Thread {

        private final Buffer buffer;

        private final long delay;

        private final int nToRemove;

        public DelayedIteratorRemove(Buffer buffer, long delay, int nToRemove) {
            this.buffer = buffer;
            this.delay = delay;
            this.nToRemove = nToRemove;
        }

        public DelayedIteratorRemove(Buffer buffer, long delay) {
            this(buffer, delay, 1);
        }

        public void run() {
            try {
                Thread.sleep(delay);
                Iterator iter = buffer.iterator();
                for (int i = 0; i < nToRemove; ++i) {
                    iter.next();
                    iter.remove();
                }

            } catch (InterruptedException e) {
            }
        }
    }

    private class DelayedRemove extends Thread {

        private final Buffer buffer;

        private final long delay;

        private final int nToRemove;

        public DelayedRemove(Buffer buffer, long delay, int nToRemove) {
            this.buffer = buffer;
            this.delay = delay;
            this.nToRemove = nToRemove;
        }

        public DelayedRemove(Buffer buffer, long delay) {
            this(buffer, delay, 1);
        }

        public void run() {
            try {
                Thread.sleep(delay);
                for (int i = 0; i < nToRemove; ++i) {
                    buffer.remove();
                }
            } catch (InterruptedException e) {
            }
        }
    }
}