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@@ -0,0 +1,76 @@
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+/*
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+ * Licensed to the Apache Software Foundation (ASF) under one
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+ * or more contributor license agreements. See the NOTICE file
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+ * distributed with this work for additional information
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+ * regarding copyright ownership. The ASF licenses this file
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+ * to you under the Apache License, Version 2.0 (the
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+ * "License"); you may not use this file except in compliance
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+ * with the License. You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+package org.apache.hadoop.utils;
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+
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+import static org.junit.Assert.assertEquals;
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+import static org.junit.jupiter.api.Assertions.assertThrows;
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+
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+import org.apache.hadoop.io.retry.RetryPolicies;
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+import org.apache.hadoop.io.retry.RetryPolicy;
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+import org.junit.Test;
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+
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+import java.io.IOException;
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+import java.util.concurrent.TimeUnit;
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+import java.util.concurrent.atomic.AtomicInteger;
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+import java.util.zip.ZipException;
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+
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+/**
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+ * Tests for {@link RetriableTask}.
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+ */
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+public class TestRetriableTask {
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+
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+ @Test
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+ public void returnsSuccessfulResult() throws Exception {
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+ String result = "bilbo";
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+ RetriableTask<String> task = new RetriableTask<>(
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+ RetryPolicies.RETRY_FOREVER, "test", () -> result);
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+ assertEquals(result, task.call());
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+ }
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+
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+ @Test
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+ public void returnsSuccessfulResultAfterFailures() throws Exception {
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+ String result = "gandalf";
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+ AtomicInteger attempts = new AtomicInteger();
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+ RetriableTask<String> task = new RetriableTask<>(
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+ RetryPolicies.RETRY_FOREVER, "test",
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+ () -> {
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+ if (attempts.incrementAndGet() <= 2) {
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+ throw new Exception("testing");
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+ }
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+ return result;
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+ });
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+ assertEquals(result, task.call());
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+ }
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+
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+ @Test
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+ public void respectsRetryPolicy() {
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+ int expectedAttempts = 3;
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+ AtomicInteger attempts = new AtomicInteger();
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+ RetryPolicy retryPolicy = RetryPolicies.retryUpToMaximumCountWithFixedSleep(
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+ expectedAttempts, 1, TimeUnit.MILLISECONDS);
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+ RetriableTask<String> task = new RetriableTask<>(retryPolicy, "thr", () -> {
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+ attempts.incrementAndGet();
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+ throw new ZipException("testing");
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+ });
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+
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+ IOException e = assertThrows(IOException.class, task::call);
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+ assertEquals(ZipException.class, e.getCause().getClass());
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+ assertEquals(expectedAttempts, attempts.get());
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+ }
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+
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+}
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Márton Elek