RetryProxy.java
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上传日期:2018-01-08
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文件大小:3k
- /*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. The ASF licenses this file
- * to you 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.apache.hadoop.io.retry;
- import java.lang.reflect.Proxy;
- import java.util.Map;
- /**
- * <p>
- * A factory for creating retry proxies.
- * </p>
- */
- public class RetryProxy {
- /**
- * <p>
- * Create a proxy for an interface of an implementation class
- * using the same retry policy for each method in the interface.
- * </p>
- * @param iface the interface that the retry will implement
- * @param implementation the instance whose methods should be retried
- * @param retryPolicy the policy for retirying method call failures
- * @return the retry proxy
- */
- public static Object create(Class<?> iface, Object implementation,
- RetryPolicy retryPolicy) {
- return Proxy.newProxyInstance(
- implementation.getClass().getClassLoader(),
- new Class<?>[] { iface },
- new RetryInvocationHandler(implementation, retryPolicy)
- );
- }
-
- /**
- * <p>
- * Create a proxy for an interface of an implementation class
- * using the a set of retry policies specified by method name.
- * If no retry policy is defined for a method then a default of
- * {@link RetryPolicies#TRY_ONCE_THEN_FAIL} is used.
- * </p>
- * @param iface the interface that the retry will implement
- * @param implementation the instance whose methods should be retried
- * @param methodNameToPolicyMap a map of method names to retry policies
- * @return the retry proxy
- */
- public static Object create(Class<?> iface, Object implementation,
- Map<String,RetryPolicy> methodNameToPolicyMap) {
- return Proxy.newProxyInstance(
- implementation.getClass().getClassLoader(),
- new Class<?>[] { iface },
- new RetryInvocationHandler(implementation, methodNameToPolicyMap)
- );
- }
- }