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java重试, 支持同步/异步, 简单灵活可配, 不依赖第三方库.
基于guava-retrying改造, 增加了异步重试, 同时去掉了第三方依赖, 使用方法基本一致.
| 名称 | JDK | 第三方依赖 | 同步重试 | 异步重试 |
|---|---|---|---|---|
| guava-retrying | 大于等于6 | guava,findbugs | Y | N |
| java-retrying | 大于等于8 | 无 | Y | Y |
- 依赖
<dependency> <groupId>com.github.lowzj</groupId> <artifactId>java-retrying</artifactId> <version>1.2</version> </dependency>
- 同步重试
Retryer<Integer> retryer = RetryerBuilder.<Integer>newBuilder() .withWaitStrategy(WaitStrategies.fixedWait(100L, TimeUnit.MILLISECONDS)) .retryIfResult(num -> num != 5) .retryIfExceptionOfType(RuntimeException.class) .withStopStrategy(StopStrategies.stopAfterAttempt(7)) .build(); try { retryer.call(noRuntimeExceptionAfter(4)); } catch (ExecutionException | RetryException e) { e.printStackTrace(); }
- 异步重试
AsyncRetryer<Integer> asyncRetryer = RetryerBuilder.<Integer>newBuilder() .withWaitStrategy(WaitStrategies.fixedWait(100L, TimeUnit.MILLISECONDS)) .retryIfResult(num -> num != 4) .retryIfExceptionOfType(RuntimeException.class) .withStopStrategy(StopStrategies.stopAfterAttempt(7)) .withExecutor(ExecutorsUtil.scheduledExecutorService("example", 1)) .buildAsyncRetryer(); CompletableFuture<Integer> future = asyncRetryer.call(noRuntimeExceptionAfter(3)); // get the result asynchronously future.whenComplete((result, error) -> System.out.println(result)); // or get the result synchronously try { System.out.println(future.get()); } catch (InterruptedException | ExecutionException e) { e.printStackTrace(); }
其中函数noRuntimeExceptionAfter如下:
private Callable<Integer> noRuntimeExceptionAfter(final int attemptNumber) { return new Callable<Integer>() { private int count = 0; @Override public Integer call() throws Exception { if (count++ < attemptNumber) { throw new RuntimeException("count[" + (count - 1) + "] < attemptNumber[" + attemptNumber + "]"); } return count; } }; }
Java-retrying is licensed under the Apache License, Version 2.0. See LICENSE for the full license text.