mocklib-checkins

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Update of /cvsroot/mocklib/mocklib3/input/javasrc/biz/xsoftware/examples/behavior
In directory sc8-pr-cvs7.sourceforge.net:/tmp/cvs-serv28952/input/javasrc/biz/xsoftware/examples/behavior

Added Files:
	TCPSocket.java TestExample.java 
Log Message:
add behavior example and fix socket example.

--- NEW FILE: TestExample.java ---
/*
 * Created on Jun 28, 2004
 *
 * To change the template for this generated file go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
package biz.xsoftware.examples.behavior;

import java.io.IOException;
import java.nio.ByteBuffer;

import junit.framework.TestCase;
import biz.xsoftware.mock.Behavior;
import biz.xsoftware.mock.MockObject;
import biz.xsoftware.mock.MockObjectFactory;

/**
 * JUnit Suite of TestCases for demonstrating mocking out socket
 * interfaces to test network failures.
 * 
 * @author Dean Hiller
 */
public class TestExample extends TestCase {
	
	private MockObject mockSocket;
	private TCPSocket tcpSocket;

	/**
	 * @showcode
	 */
	public TestExample(String name) {
		super(name);
	}
	/**
	 * @showcode
	 */
	public void setUp() throws Exception {
		mockSocket = MockObjectFactory.createMock(TCPSocket.class);
		tcpSocket = (TCPSocket)mockSocket;
	}
	/**
	 * @showcode
	 */
	public void tearDown() throws IOException {

	}
	
	/**
	 * Test that upon network problems like IOException when writing to server
	 * that other subsystems get cleaned up properly.  The simple test below 
	 * shows how this can be done and extended to more complicated network
	 * recovery algorithms.
	 * @throws IOException 
	 * 
	 * @showcode
	 */
	public void testNetworkProblems() throws IOException {
		
		mockSocket.addBehavior(new MyBehavior(), "write");
		
		byte[] data = new byte[] { 1, 2, 3, 4 };
		ByteBuffer b = ByteBuffer.allocate(100);
		b.put(data);
		b.flip();
		
		tcpSocket.write(b);
		
		//now, our mockobject better have simulated what a real tcpSocket would do...
		assertEquals(0, b.remaining());
		
		//now the param passed to the mockobject better be what we passed.....
		ByteBuffer b2 = (ByteBuffer) mockSocket.expect("write").getAllParams()[0];
		byte[] actual = new byte[4];
		b2.get(actual);
		
		assertEquals(data.length, actual.length);
		for(int i = 0; i < actual.length; i++) {
			assertEquals(data[i], actual[i]);
		}
	}

	private class MyBehavior implements Behavior {
		public Object[] writeCloner(ByteBuffer b) {
			ByteBuffer clone = ByteBuffer.allocate(b.capacity());
			clone.put(b);
			
			//rewind original buffer so it appears not have been modified by
			//cloning method....
			b.rewind();
			
			//flip the clone and it will match the given buffer exactly....
			clone.flip();
			
			//return the clone
			return new Object[] { clone };
		}
		
		public int write(ByteBuffer b) {
			//simulate the ByteBuffer being read....
			int remaining = b.remaining();
			byte[] data = new byte[remaining];
			b.get(data);
			
			return remaining;
		}
	}
}

--- NEW FILE: TCPSocket.java ---
/*
 * Created on Jul 3, 2004
 *
 * To change the template for this generated file go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
package biz.xsoftware.examples.behavior;

import java.io.IOException;
import java.nio.ByteBuffer;

/**
 * Abstraction of a Socket to allow testing.
 * 
 * @author Dean Hiller
 */
public interface TCPSocket {

	public int read(ByteBuffer b) throws IOException;
	
	public int write(ByteBuffer b) throws IOException;
}