Rename misnamed file

spring-batch-execution/src/main/java/org/springframework/batch/execution/step/support/DefaultStepExecutionSynchronizer.java

@@ -0,0 +1,44 @@
+/*
+ * 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.execution.step.support;
+
+import org.springframework.batch.core.domain.StepExecution;
+
+import edu.emory.mathcs.backport.java.util.concurrent.Semaphore;
+
+/**
+ * @author Dave Syer
+ *
+ */
+public class DefaultStepExecutionSynchronizer implements StepExecutionSynchronizer {
+
+	private Semaphore semaphore = new Semaphore(1);
+	
+	/* (non-Javadoc)
+	 * @see org.springframework.batch.execution.step.support.StepExecutionSynchronizer#lock(org.springframework.batch.core.domain.StepExecution)
+	 */
+	public void lock(StepExecution stepExecution) throws InterruptedException {
+		semaphore.acquire();
+	}
+
+	/* (non-Javadoc)
+	 * @see org.springframework.batch.execution.step.support.StepExecutionSynchronizer#release(org.springframework.batch.core.domain.StepExecution)
+	 */
+	public void release(StepExecution stepExecution) {
+		semaphore.release();
+	}
+
+}