/*
    * Copyright 2006-2007 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.batch.retry.policy;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  import java.util.Collections;
  
  import org.junit.Test;
  import org.springframework.batch.retry.ExhaustedRetryException;
  import org.springframework.batch.retry.RetryState;
  import org.springframework.batch.retry.RetryCallback;
  import org.springframework.batch.retry.RetryContext;
  import org.springframework.batch.retry.support.DefaultRetryState;
  import org.springframework.batch.retry.support.RetryTemplate;
  
  /**
   * @author Dave Syer
   * 
   */
  public class StatefulRetryIntegrationTests {
  
  	@Test
  	public void testExternalRetryWithFailAndNoRetry() throws Exception {
  		MockRetryCallback callback = new MockRetryCallback();
  
  		RetryState retryState = new DefaultRetryState("foo");
  
  		RetryTemplate retryTemplate = new RetryTemplate();
  		MapRetryContextCache cache = new MapRetryContextCache();
  		retryTemplate.setRetryContextCache(cache);
  		retryTemplate.setRetryPolicy(new SimpleRetryPolicy(1, Collections
  				.<Class<? extends Throwable>, Boolean> singletonMap(Exception.class, true)));
  
  		assertFalse(cache.containsKey("foo"));
  
  		try {
  			retryTemplate.execute(callback, retryState);
  			// The first failed attempt we expect to retry...
  			fail("Expected RuntimeException");
  		}
  		catch (RuntimeException e) {
  			assertEquals(null, e.getMessage());
  		}
  
  		assertTrue(cache.containsKey("foo"));
  
  		try {
  			retryTemplate.execute(callback, retryState);
  			// We don't get a second attempt...
  			fail("Expected ExhaustedRetryException");
  		}
  		catch (ExhaustedRetryException e) {
  			// This is now the "exhausted" message:
  			assertNotNull(e.getMessage());
  		}
  
  		assertFalse(cache.containsKey("foo"));
  
  		// Callback is called once: the recovery path should be called in
  		// handleRetryExhausted (so not in this test)...
  		assertEquals(1, callback.attempts);
  	}
  
  	@Test
  	public void testExternalRetryWithSuccessOnRetry() throws Exception {
  		MockRetryCallback callback = new MockRetryCallback();
  
  		RetryState retryState = new DefaultRetryState("foo");
  
  		RetryTemplate retryTemplate = new RetryTemplate();
  		MapRetryContextCache cache = new MapRetryContextCache();
  		retryTemplate.setRetryContextCache(cache);
  		retryTemplate.setRetryPolicy(new SimpleRetryPolicy(2, Collections
  				.<Class<? extends Throwable>, Boolean> singletonMap(Exception.class, true)));
  
  		assertFalse(cache.containsKey("foo"));
  
  		Object result = "start_foo";
  		try {
  			result = retryTemplate.execute(callback, retryState);
 			// The first failed attempt we expect to retry...
 			fail("Expected RuntimeException");
 		}
 		catch (RuntimeException e) {
 			assertNull(e.getMessage());
 		}
 
 		assertTrue(cache.containsKey("foo"));
 
 		result = retryTemplate.execute(callback, retryState);
 
 		assertFalse(cache.containsKey("foo"));
 
 		assertEquals(2, callback.attempts);
 		assertEquals("bar", result);
 	}
 
 	/**
 	 * @author Dave Syer
 	 * 
 	 */
 	private static final class MockRetryCallback implements RetryCallback<String> {
 		int attempts = 0;
 
 		public String doWithRetry(RetryContext context) throws Exception {
 			attempts++;
 			if (attempts < 2) {
 				throw new RuntimeException();
 			}
 			return "bar";
 		}
 	}
 
 }