added @Async annotation, AsyncExecutionInterceptor, AsyncAnnotationAdvisor

org.springframework.aop/src/main/java/org/springframework/aop/interceptor/AsyncExecutionInterceptor.java

@@ -0,0 +1,103 @@
+/*
+ * Copyright 2002-2009 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.aop.interceptor;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Future;
+
+import org.aopalliance.intercept.MethodInterceptor;
+import org.aopalliance.intercept.MethodInvocation;
+
+import org.springframework.core.Ordered;
+import org.springframework.core.task.AsyncTaskExecutor;
+import org.springframework.core.task.support.TaskExecutorAdapter;
+import org.springframework.util.Assert;
+import org.springframework.util.ReflectionUtils;
+
+/**
+ * AOP Alliance <code>MethodInterceptor</code> that processes method invocations
+ * asynchronously, using a given {@link org.springframework.core.task.AsyncTaskExecutor}.
+ * Typically used with the {@link org.springframework.context.task.Async} annotation.
+ *
+ * <p>In terms of target method signatures, any parameter types are supported.
+ * However, the return type is constrained to either <code>void</code> or
+ * <code>java.util.concurrent.Future</code>. In the latter case, the Future handle
+ * returned from the proxy will be an actual asynchronous Future that can be used
+ * to track the result of the asynchronous method execution. However, since the
+ * target method needs to implement the same signature, it will have to return
+ * a temporary Future handle that just passes the return value through
+ * (like Spring's {@link org.springframework.scheduling.annotation.AsyncResult}
+ * or EJB 3.1's <code>javax.ejb.AsyncResult</code>).
+ *
+ * @author Juergen Hoeller
+ * @since 3.0
+ * @see org.springframework.scheduling.annotation.Async
+ * @see org.springframework.scheduling.annotation.AsyncAnnotationAdvisor
+ */
+public class AsyncExecutionInterceptor implements MethodInterceptor, Ordered {
+
+	private final AsyncTaskExecutor asyncExecutor;
+
+
+	/**
+	 * Create a new AsyncExecutionInterceptor.
+	 * @param asyncExecutor the Spring AsyncTaskExecutor to delegate to
+	 */
+	public AsyncExecutionInterceptor(AsyncTaskExecutor asyncExecutor) {
+		Assert.notNull(asyncExecutor, "TaskExecutor must not be null");
+		this.asyncExecutor = asyncExecutor;
+	}
+
+	/**
+	 * Create a new AsyncExecutionInterceptor.
+	 * @param asyncExecutor the <code>java.util.concurrent</code> Executor
+	 * to delegate to (typically a {@link java.util.concurrent.ExecutorService}
+	 */
+	public AsyncExecutionInterceptor(Executor asyncExecutor) {
+		this.asyncExecutor = new TaskExecutorAdapter(asyncExecutor);
+	}
+
+
+	public Object invoke(final MethodInvocation invocation) throws Throwable {
+		Future result = this.asyncExecutor.submit(new Callable<Object>() {
+			public Object call() throws Exception {
+				try {
+					Object result = invocation.proceed();
+					if (result instanceof Future) {
+						return ((Future) result).get();
+					}
+				}
+				catch (Throwable ex) {
+					ReflectionUtils.rethrowException(ex);
+				}
+				return null;
+			}
+		});
+		if (Future.class.isAssignableFrom(invocation.getMethod().getReturnType())) {
+			return result;
+		}
+		else {
+			return null;
+		}
+	}
+
+	public int getOrder() {
+		return Ordered.HIGHEST_PRECEDENCE;
+	}
+
+}