OPEN - issue BATCH-890, BATCH-879: Stop transition in XML namespace, decision state support.

Added StepExecution to decider interface and some protection for multithreaded job executions.

spring-batch-infrastructure/src/main/java/org/springframework/batch/flow/FlowExecutionListener.java

@@ -0,0 +1,29 @@
+/*
+ * 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.flow;
+
+/**
+ * @author Dave Syer
+ *
+ */
+public interface FlowExecutionListener {
+
+	/**
+	 * @param result
+	 */
+	void close(FlowExecution result);
+
+}

spring-batch-infrastructure/src/main/java/org/springframework/batch/flow/FlowExecutionListenerSupport.java

@@ -0,0 +1,31 @@
+/*
+ * 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.flow;
+
+/**
+ * @author Dave Syer
+ *
+ */
+public class FlowExecutionListenerSupport implements FlowExecutionListener {
+
+	/**
+	 * No-op implementation.
+	 * @see FlowExecutionListener#close(FlowExecution)
+	 */
+	public void close(FlowExecution result) {
+	}
+
+}

spring-batch-infrastructure/src/main/java/org/springframework/batch/flow/SimpleFlow.java

@@ -111,21 +111,37 @@ public class SimpleFlow<T> implements Flow<T>, InitializingBean {
 	 * @see Flow#resume(String, Object)
 	 */
 	public FlowExecution resume(String stateName, T context) throws FlowExecutionException {
+
 		String status = FlowExecution.UNKNOWN;
 		State<T> state = stateMap.get(stateName);
+
+		FlowExecutionListener listener = new FlowExecutionListenerSupport();
+		if (context instanceof FlowExecutionListener) {
+			listener = (FlowExecutionListener)context;
+		}
+
 		// Terminate if there are no more states
 		while (state != null) {
+
 			stateName = state.getName();
+
 			try {
 				status = state.handle(context);
 			}
 			catch (Exception e) {
+				listener.close(new FlowExecution(stateName, status));
 				throw new FlowExecutionException(String.format("Ended flow=%s at state=%s with exception", name,
 						stateName), e);
 			}
+
 			state = nextState(stateName, status);
+
 		}
-		return new FlowExecution(stateName, status);
+
+		FlowExecution result = new FlowExecution(stateName, status);
+		listener.close(result);
+		return result; 
+
 	}
 
 	/**