| /* |
| * 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 retrying method call failures |
| * @return the retry proxy |
| */ |
| public static Object create(Class<?> iface, Object implementation, |
| RetryPolicy retryPolicy) { |
| return RetryProxy.create(iface, |
| new DefaultFailoverProxyProvider(iface, implementation), |
| retryPolicy); |
| } |
| |
| /** |
| * Create a proxy for an interface of implementations of that interface using |
| * the given {@link FailoverProxyProvider} and the same retry policy for each |
| * method in the interface. |
| * |
| * @param iface the interface that the retry will implement |
| * @param proxyProvider provides implementation instances whose methods should be retried |
| * @param retryPolicy the policy for retrying or failing over method call failures |
| * @return the retry proxy |
| */ |
| public static Object create(Class<?> iface, FailoverProxyProvider proxyProvider, |
| RetryPolicy retryPolicy) { |
| return Proxy.newProxyInstance( |
| proxyProvider.getInterface().getClassLoader(), |
| new Class<?>[] { iface }, |
| new RetryInvocationHandler(proxyProvider, retryPolicy) |
| ); |
| } |
| |
| /** |
| * 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. |
| * |
| * @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 create(iface, |
| new DefaultFailoverProxyProvider(iface, implementation), |
| methodNameToPolicyMap, |
| RetryPolicies.TRY_ONCE_THEN_FAIL); |
| } |
| |
| /** |
| * Create a proxy for an interface of implementations of that interface using |
| * the given {@link FailoverProxyProvider} and 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. |
| * |
| * @param iface the interface that the retry will implement |
| * @param proxyProvider provides implementation instances whose methods should be retried |
| * @param methodNameToPolicyMapa map of method names to retry policies |
| * @return the retry proxy |
| */ |
| public static Object create(Class<?> iface, FailoverProxyProvider proxyProvider, |
| Map<String,RetryPolicy> methodNameToPolicyMap, |
| RetryPolicy defaultPolicy) { |
| return Proxy.newProxyInstance( |
| proxyProvider.getInterface().getClassLoader(), |
| new Class<?>[] { iface }, |
| new RetryInvocationHandler(proxyProvider, defaultPolicy, |
| methodNameToPolicyMap) |
| ); |
| } |
| } |