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BulkheadTest.java
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BulkheadTest.java
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/*
* Copyright 2021 the original author or authors.
*
* 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 dev.failsafe.functional;
import dev.failsafe.Bulkhead;
import dev.failsafe.BulkheadFullException;
import dev.failsafe.Failsafe;
import dev.failsafe.FailsafeExecutor;
import dev.failsafe.function.CheckedRunnable;
import dev.failsafe.testing.Testing;
import org.testng.Assert;
import org.testng.annotations.Test;
import java.time.Duration;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
/**
* Tests various Bulkhead scenarios.
*/
@Test
public class BulkheadTest extends Testing {
public void testPermitAcquiredAfterWait() {
// Given
Bulkhead<Object> bulkhead = Bulkhead.builder(2).withMaxWaitTime(Duration.ofSeconds(1)).build();
// When / Then
testGetSuccess(() -> {
bulkhead.tryAcquirePermit();
bulkhead.tryAcquirePermit(); // bulkhead should be full
runInThread(() -> {
Thread.sleep(200);
bulkhead.releasePermit(); // bulkhead should not be full
});
}, Failsafe.with(bulkhead), ctx -> {
return "test";
}, "test");
}
public void testPermitAcquiredAfterWaitWithLargeQueue(){
Bulkhead<Object> bulkhead = Bulkhead.builder(1).withMaxWaitTime(Duration.ofSeconds(1)).build();
FailsafeExecutor<Object> exec = Failsafe.with(bulkhead);
CompletableFuture<Void>[] tasks = new CompletableFuture[10];
for(int i = 0; i < tasks.length; i++){
int index = i;
CheckedRunnable sleep = () -> {
ignoreExceptions(() ->{
System.out.println("Running sleep task " + (index + 1));
TimeUnit.MILLISECONDS.sleep(10);
System.out.println("Finished sleep task " + (index + 1));
});
};
CompletableFuture<Void> task = exec.runAsync(sleep);
task.whenComplete((r, ex) -> Assert.assertNull(ex));
tasks[i] = task;
}
CompletableFuture.allOf(tasks).join();
}
public void shouldThrowBulkheadFullExceptionAfterPermitsExceeded() {
// Given
Bulkhead<Object> bulkhead = Bulkhead.of(2);
bulkhead.tryAcquirePermit();
bulkhead.tryAcquirePermit(); // bulkhead should be full
// When / Then
testRunFailure(Failsafe.with(bulkhead), ctx -> {
}, BulkheadFullException.class);
}
/**
* Asserts that an exceeded maxWaitTime causes BulkheadFullException.
*/
public void testMaxWaitTimeExceeded() {
// Given
Bulkhead<Object> bulkhead = Bulkhead.builder(2).withMaxWaitTime(Duration.ofMillis(20)).build();
bulkhead.tryAcquirePermit();
bulkhead.tryAcquirePermit(); // bulkhead should be full
// When / Then
testRunFailure(Failsafe.with(bulkhead), ctx -> {
}, BulkheadFullException.class);
}
}