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Extract out RetryPolicy from Paginator so that it can be used elsewhere.
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src/main/java/com/google/cloud/genomics/utils/RetryPolicy.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| /* | ||
| * Copyright (C) 2014 Google Inc. | ||
| * | ||
| * 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 com.google.cloud.genomics.utils; | ||
|
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| import com.google.api.services.genomics.GenomicsRequest; | ||
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| import java.io.IOException; | ||
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| /** | ||
| * An object describing when to retry if a request fails. | ||
| */ | ||
| public abstract class RetryPolicy<R extends GenomicsRequest<?>> { | ||
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| /** | ||
| * An instance is instantiated each time a request is made to the API and is consulted only if | ||
| * the request failed. | ||
| */ | ||
| public abstract class Instance { | ||
|
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| /** | ||
| * Should we retry the request or not? | ||
| */ | ||
| protected abstract boolean shouldRetry(R request, IOException e); | ||
| } | ||
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| public static final RetryPolicy<GenomicsRequest<?>> | ||
| /** Retry requests indefinitely */ | ||
| ALWAYS_RETRY = constant(true), | ||
| /** Never retry requests */ | ||
| NEVER_RETRY = constant(false); | ||
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| private static RetryPolicy<GenomicsRequest<?>> constant(final boolean retry) { | ||
| return new RetryPolicy<GenomicsRequest<?>>() { | ||
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| private final Instance instance = | ||
| new Instance() { | ||
| @Override protected boolean shouldRetry( | ||
| GenomicsRequest<?> genomicsRequest, IOException e) { | ||
| return retry; | ||
| } | ||
| }; | ||
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| @Override protected Instance createInstance() { | ||
| return instance; | ||
| } | ||
| }; | ||
| } | ||
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| /** | ||
| * Retry requests up to {@code n} times. | ||
| */ | ||
| public static RetryPolicy<GenomicsRequest<?>> nAttempts(final int n) { | ||
| return new RetryPolicy<GenomicsRequest<?>>() { | ||
| @Override protected Instance createInstance() { | ||
| return new Instance() { | ||
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| private int count = 0; | ||
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| @Override protected boolean shouldRetry( | ||
| GenomicsRequest<?> genomicsRequest, IOException e) { | ||
| return count++ < n; | ||
| } | ||
| }; | ||
| } | ||
| }; | ||
| } | ||
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| protected abstract Instance createInstance(); | ||
| } |