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feat: retry completable future on exception (#599)
Signed-off-by: Li Zhanhui <[email protected]>
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42 changes: 42 additions & 0 deletions
42
metadata/src/main/java/com/automq/rocketmq/metadata/Futures.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
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| package com.automq.rocketmq.metadata; | ||
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| import java.util.concurrent.CompletableFuture; | ||
| import java.util.concurrent.Executor; | ||
| import java.util.function.Supplier; | ||
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| public class Futures { | ||
| /** | ||
| * Executes a loop using CompletableFutures, without invoking join()/get() on any of them or exclusively hogging a thread. | ||
| * | ||
| * @param condition A Supplier that indicates whether to proceed with the loop or not. | ||
| * @param loopBody A Supplier that returns a CompletableFuture which represents the body of the loop. This | ||
| * supplier is invoked every time the loopBody needs to execute. | ||
| * @param executor An Executor that is used to execute the condition and the loop support code. | ||
| * @return A CompletableFuture that, when completed, indicates the loop terminated without any exception. If | ||
| * either the loopBody or condition throw/return Exceptions, these will be set as the result of this returned Future. | ||
| */ | ||
| public static CompletableFuture<Void> loop(Supplier<Boolean> condition, Supplier<CompletableFuture<Void>> loopBody, | ||
| Executor executor) { | ||
| CompletableFuture<Void> result = new CompletableFuture<>(); | ||
| Loop<Void> loop = new Loop<>(condition, loopBody, result, executor); | ||
| executor.execute(loop); | ||
| return result; | ||
| } | ||
| } |
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metadata/src/main/java/com/automq/rocketmq/metadata/Loop.java
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|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
|
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| package com.automq.rocketmq.metadata; | ||
|
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| import java.util.concurrent.CompletableFuture; | ||
| import java.util.concurrent.Executor; | ||
| import java.util.function.Supplier; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
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| public class Loop<T> implements Runnable { | ||
| private static final Logger LOGGER = LoggerFactory.getLogger(Loop.class); | ||
|
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| final Supplier<Boolean> condition; | ||
| final Supplier<CompletableFuture<T>> loopBody; | ||
|
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| /** | ||
| * A CompletableFuture that will be completed, whether normally or exceptionally, when the loop completes. | ||
| */ | ||
| final CompletableFuture<Void> result; | ||
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| final Executor executor; | ||
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| public Loop(Supplier<Boolean> condition, Supplier<CompletableFuture<T>> loopBody, CompletableFuture<Void> result, | ||
| Executor executor) { | ||
| this.condition = condition; | ||
| this.loopBody = loopBody; | ||
| this.result = result; | ||
| this.executor = executor; | ||
| } | ||
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| @Override | ||
| public void run() { | ||
| execute(); | ||
| } | ||
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| void execute() { | ||
| if (this.condition.get()) { | ||
| this.loopBody.get() | ||
| .exceptionally(e -> { | ||
| LOGGER.error("Unexpected exception raised", e); | ||
| return null; | ||
| }).thenRunAsync(this, executor); | ||
| } else { | ||
| result.complete(null); | ||
| LOGGER.debug("Loop completed"); | ||
| } | ||
| } | ||
| } |
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