[120] | 1 | /* |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | package org.apache.hadoop.io.retry; |
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| 19 | |
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| 20 | import java.lang.reflect.Proxy; |
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| 21 | import java.util.Map; |
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| 22 | |
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| 23 | /** |
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| 24 | * <p> |
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| 25 | * A factory for creating retry proxies. |
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| 26 | * </p> |
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| 27 | */ |
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| 28 | public class RetryProxy { |
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| 29 | /** |
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| 30 | * <p> |
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| 31 | * Create a proxy for an interface of an implementation class |
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| 32 | * using the same retry policy for each method in the interface. |
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| 33 | * </p> |
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| 34 | * @param iface the interface that the retry will implement |
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| 35 | * @param implementation the instance whose methods should be retried |
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| 36 | * @param retryPolicy the policy for retirying method call failures |
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| 37 | * @return the retry proxy |
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| 38 | */ |
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| 39 | public static Object create(Class<?> iface, Object implementation, |
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| 40 | RetryPolicy retryPolicy) { |
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| 41 | return Proxy.newProxyInstance( |
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| 42 | implementation.getClass().getClassLoader(), |
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| 43 | new Class<?>[] { iface }, |
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| 44 | new RetryInvocationHandler(implementation, retryPolicy) |
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| 45 | ); |
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| 46 | } |
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| 47 | |
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| 48 | /** |
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| 49 | * <p> |
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| 50 | * Create a proxy for an interface of an implementation class |
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| 51 | * using the a set of retry policies specified by method name. |
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| 52 | * If no retry policy is defined for a method then a default of |
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| 53 | * {@link RetryPolicies#TRY_ONCE_THEN_FAIL} is used. |
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| 54 | * </p> |
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| 55 | * @param iface the interface that the retry will implement |
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| 56 | * @param implementation the instance whose methods should be retried |
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| 57 | * @param methodNameToPolicyMap a map of method names to retry policies |
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| 58 | * @return the retry proxy |
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| 59 | */ |
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| 60 | public static Object create(Class<?> iface, Object implementation, |
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| 61 | Map<String,RetryPolicy> methodNameToPolicyMap) { |
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| 62 | return Proxy.newProxyInstance( |
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| 63 | implementation.getClass().getClassLoader(), |
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| 64 | new Class<?>[] { iface }, |
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| 65 | new RetryInvocationHandler(implementation, methodNameToPolicyMap) |
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| 66 | ); |
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| 67 | } |
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| 68 | } |
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