/*
 * Copyright 2006-2013 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.batch.core.step.item;

import java.util.Collection;
import java.util.Collections;

import junit.framework.TestCase;

import org.springframework.batch.repeat.RepeatContext;
import org.springframework.batch.repeat.context.RepeatContextSupport;
import org.springframework.batch.repeat.exception.SimpleLimitExceptionHandler;
import org.springframework.batch.repeat.support.RepeatSynchronizationManager;
import org.springframework.retry.RetryContext;
import org.springframework.retry.RetryPolicy;
import org.springframework.retry.policy.AlwaysRetryPolicy;
import org.springframework.retry.policy.NeverRetryPolicy;

/**
 * @author Dave Syer
 *
 */
public class SimpleRetryExceptionHandlerTests extends TestCase {

	private RepeatContext context = new RepeatContextSupport(new RepeatContextSupport(null));

	/*
	 * (non-Javadoc)
	 *
	 * @see junit.framework.TestCase#setUp()
	 */
	@Override
	protected void setUp() throws Exception {
		RepeatSynchronizationManager.register(context);
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see junit.framework.TestCase#tearDown()
	 */
	@Override
	protected void tearDown() throws Exception {
		RepeatSynchronizationManager.clear();
	}

	/**
	 * Test method for
	 * {@link org.springframework.batch.core.step.item.SimpleRetryExceptionHandler#handleException(org.springframework.batch.repeat.RepeatContext, java.lang.Throwable)} .
	 */
	public void testRethrowWhenRetryExhausted() throws Throwable {

		RetryPolicy retryPolicy = new NeverRetryPolicy();
		RuntimeException ex = new RuntimeException("foo");

		SimpleRetryExceptionHandler handler = getHandlerAfterRetry(retryPolicy, ex, Collections
				.<Class<? extends Throwable>> singleton(Error.class));

		// Then pretend to handle the exception in the parent context...
		try {
			handler.handleException(context.getParent(), ex);
			fail("Expected RuntimeException");
		}
		catch (RuntimeException e) {
			assertEquals(ex, e);
		}

		assertEquals(0, context.attributeNames().length);
		// One for the retry exhausted flag and one for the counter in the
		// delegate exception handler
		assertEquals(2, context.getParent().attributeNames().length);
	}

	/**
	 * Test method for
	 * {@link org.springframework.batch.core.step.item.SimpleRetryExceptionHandler#handleException(org.springframework.batch.repeat.RepeatContext, java.lang.Throwable)} .
	 */
	public void testNoRethrowWhenRetryNotExhausted() throws Throwable {

		RetryPolicy retryPolicy = new AlwaysRetryPolicy();
		RuntimeException ex = new RuntimeException("foo");

		SimpleRetryExceptionHandler handler = getHandlerAfterRetry(retryPolicy, ex, Collections
				.<Class<? extends Throwable>> singleton(Error.class));

		// Then pretend to handle the exception in the parent context...
		handler.handleException(context.getParent(), ex);

		assertEquals(0, context.attributeNames().length);
		assertEquals(0, context.getParent().attributeNames().length);
	}

	/**
	 * Test method for
	 * {@link org.springframework.batch.core.step.item.SimpleRetryExceptionHandler#handleException(org.springframework.batch.repeat.RepeatContext, java.lang.Throwable)} .
	 */
	public void testRethrowWhenFatal() throws Throwable {

		RetryPolicy retryPolicy = new AlwaysRetryPolicy();
		RuntimeException ex = new RuntimeException("foo");

		SimpleRetryExceptionHandler handler = getHandlerAfterRetry(retryPolicy, ex, Collections
				.<Class<? extends Throwable>> singleton(RuntimeException.class));

		// Then pretend to handle the exception in the parent context...
		try {
			handler.handleException(context.getParent(), ex);
			fail("Expected RuntimeException");
		}
		catch (RuntimeException e) {
			assertEquals(ex, e);
		}

		assertEquals(0, context.attributeNames().length);
		// One for the counter in the delegate exception handler
		assertEquals(1, context.getParent().attributeNames().length);
	}

	/**
	 * @param retryPolicy
	 * @param ex
	 * @return
	 */
	private SimpleRetryExceptionHandler getHandlerAfterRetry(RetryPolicy retryPolicy, RuntimeException ex,
			Collection<Class<? extends Throwable>> fatalExceptions) {

		// Always rethrow if the retry is exhausted
		SimpleRetryExceptionHandler handler = new SimpleRetryExceptionHandler(retryPolicy,
				new SimpleLimitExceptionHandler(0), fatalExceptions);

		// Simulate a failed retry...
		RetryContext retryContext = retryPolicy.open(null);
		retryPolicy.registerThrowable(retryContext, ex);
		handler.close(retryContext, null, ex);
		return handler;
	}

}