RESOLVED - issue BATCH-786: Transactional flushing for file writers

Added TransactionAwareBuffererdWriter

spring-batch-infrastructure/src/test/java/org/springframework/batch/support/transaction/TransactionAwareBufferedWriterTests.java

@@ -0,0 +1,141 @@
+/*
+ * 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.support.transaction;
+
+import static org.junit.Assert.*;
+
+import java.io.IOException;
+import java.io.StringWriter;
+import java.io.Writer;
+
+import org.junit.Test;
+import org.springframework.batch.support.transaction.ResourcelessTransactionManager;
+import org.springframework.batch.support.transaction.TransactionAwareBufferedWriter;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.TransactionStatus;
+import org.springframework.transaction.support.TransactionCallback;
+import org.springframework.transaction.support.TransactionTemplate;
+
+/**
+ * @author Dave Syer
+ * 
+ */
+public class TransactionAwareBufferedWriterTests {
+
+	private Writer stringWriter = new StringWriter();
+
+	private TransactionAwareBufferedWriter writer = new TransactionAwareBufferedWriter(stringWriter);
+
+	private PlatformTransactionManager transactionManager = new ResourcelessTransactionManager();
+
+	private boolean flushed = false;
+
+	/**
+	 * Test method for
+	 * {@link org.springframework.batch.support.transaction.TransactionAwareBufferedWriter#write(java.lang.String)}
+	 * .
+	 * @throws Exception
+	 */
+	@Test
+	public void testWriteOutsideTransaction() throws Exception {
+		writer.write("foo");
+		writer.flush();
+		assertEquals("foo", stringWriter.toString());
+	}
+
+	@Test
+	public void testCloseOutsideTransaction() throws Exception {
+		writer.write("foo");
+		writer.close();
+		assertEquals("foo", stringWriter.toString());
+	}
+
+	@Test
+	public void testFlushInTransaction() throws Exception {
+		Writer mock = new Writer() {
+			@Override
+			public void close() throws IOException {
+				throw new UnsupportedOperationException();
+			}
+
+			@Override
+			public void flush() throws IOException {
+				flushed = true;
+			}
+
+			@Override
+			public void write(char[] cbuf, int off, int len) throws IOException {
+			}
+		};
+		writer = new TransactionAwareBufferedWriter(mock);
+		new TransactionTemplate(transactionManager).execute(new TransactionCallback() {
+			public Object doInTransaction(TransactionStatus status) {
+				try {
+					writer.write("foo");
+					writer.flush();
+				}
+				catch (IOException e) {
+					throw new IllegalStateException("Unexpected IOException", e);
+				}
+				assertFalse(flushed);
+				return null;
+			}
+		});
+		assertTrue(flushed);
+	}
+
+	@Test
+	public void testWriteWithCommit() throws Exception {
+		new TransactionTemplate(transactionManager).execute(new TransactionCallback() {
+			public Object doInTransaction(TransactionStatus status) {
+				try {
+					writer.write("foo");
+				}
+				catch (IOException e) {
+					throw new IllegalStateException("Unexpected IOException", e);
+				}
+				assertEquals("", stringWriter.toString());
+				return null;
+			}
+		});
+		assertEquals("foo", stringWriter.toString());
+	}
+
+	@Test
+	public void testWriteWithRollback() throws Exception {
+		try {
+			new TransactionTemplate(transactionManager).execute(new TransactionCallback() {
+				public Object doInTransaction(TransactionStatus status) {
+					try {
+						writer.write("foo");
+					}
+					catch (IOException e) {
+						throw new IllegalStateException("Unexpected IOException", e);
+					}
+					assertEquals("", stringWriter.toString());
+					throw new RuntimeException("Planned failure");
+				}
+			});
+		}
+		catch (RuntimeException e) {
+			// expected
+			String message = e.getMessage();
+			assertEquals("Wrong message:  " + message, "Planned failure", message);
+		}
+		assertEquals("", stringWriter.toString());
+	}
+
+}