Spring Framework example source code file (RefreshableTargetSourceTests.java)

This example Spring Framework source code file (RefreshableTargetSourceTests.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 - Spring Framework tags/keywords

a, countingrefreshabletargetsource, countingrefreshabletargetsource, d, d, e, exception, exception, object, object, objects, refreshabletargetsourcetests, should, testcase

The Spring Framework RefreshableTargetSourceTests.java source code

/*
 * Copyright 2002-2007 the original author or authors.
 *
 * 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 org.springframework.aop.target.dynamic;

import junit.framework.TestCase;

/**
 * @author Rob Harrop
 */
public class RefreshableTargetSourceTests extends TestCase {

	/**
	 * Test what happens when checking for refresh but not refreshing object.
	 */
	public void testRefreshCheckWithNonRefresh() throws Exception {
		CountingRefreshableTargetSource ts = new CountingRefreshableTargetSource();
		ts.setRefreshCheckDelay(0);

		Object a = ts.getTarget();
		Thread.sleep(1);
		Object b = ts.getTarget();

		assertEquals("Should be one call to freshTarget to get initial target", 1, ts.getCallCount());
		assertSame("Returned objects should be the same - no refresh should occur", a, b);
	}

	/**
	 * Test what happens when checking for refresh and refresh occurs.
	 */
	public void testRefreshCheckWithRefresh() throws Exception {
		CountingRefreshableTargetSource ts = new CountingRefreshableTargetSource(true);
		ts.setRefreshCheckDelay(0);

		Object a = ts.getTarget();
		Thread.sleep(100);
		Object b = ts.getTarget();

		assertEquals("Should have called freshTarget twice", 2, ts.getCallCount());
		assertNotSame("Should be different objects", a, b);
	}

	/**
	 * Test what happens when no refresh occurs.
	 */
	public void testWithNoRefreshCheck() throws Exception {
		CountingRefreshableTargetSource ts = new CountingRefreshableTargetSource(true);
		ts.setRefreshCheckDelay(-1);

		Object a = ts.getTarget();
		Object b = ts.getTarget();

		assertEquals("Refresh target should only be called once", 1, ts.getCallCount());
		assertSame("Objects should be the same - refresh check delay not elapsed", a, b);
	}

	public void testRefreshOverTime() throws Exception {
		CountingRefreshableTargetSource ts = new CountingRefreshableTargetSource(true);
		ts.setRefreshCheckDelay(100);

		Object a = ts.getTarget();
		Object b = ts.getTarget();
		assertEquals("Objects should be same", a, b);

		Thread.sleep(50);

		Object c = ts.getTarget();
		assertEquals("A and C should be same", a, c);

		Thread.sleep(60);

		Object d = ts.getTarget();
		assertNotNull("D should not be null", d);
		assertFalse("A and D should not be equal", a.equals(d));

		Object e = ts.getTarget();
		assertEquals("D and E should be equal", d, e);

		Thread.sleep(110);

		Object f = ts.getTarget();
		assertFalse("E and F should be different", e.equals(f));
	}


	private static class CountingRefreshableTargetSource extends AbstractRefreshableTargetSource {

		private int callCount;

		private boolean requiresRefresh;

		public CountingRefreshableTargetSource() {
		}

		public CountingRefreshableTargetSource(boolean requiresRefresh) {
			this.requiresRefresh = requiresRefresh;
		}

		protected Object freshTarget() {
			this.callCount++;
			return new Object();
		}

		public int getCallCount() {
			return this.callCount;
		}

		protected boolean requiresRefresh() {
			return this.requiresRefresh;
		}
	}

}