RetryOnFailureTest.java

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package com.jcabi.aspects;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.hamcrest.MatcherAssert;
import org.hamcrest.Matchers;
import org.junit.Test;

/**
 * Test case for {@link RetryOnFailure} annotation and its implementation.
 * @author Yegor Bugayenko (yegor@tpc2.com)
 * @version $Id: e10d62ad6b493efdab227168d35c6107b2366981 $
 */
@SuppressWarnings("PMD.DoNotUseThreads")
public final class RetryOnFailureTest {

    /**
     * RetryOnFailure can force duplicate execution of the same method.
     * @throws Exception If something goes wrong
     */
    @Test
    public void executesMethodManyTimes() throws Exception {
        final AtomicInteger count = new AtomicInteger();
        new Runnable() {
            @Override
            @RetryOnFailure(verbose = false, unit = TimeUnit.SECONDS, delay = 1)
            public void run() {
                if (count.incrementAndGet() < 2) {
                    throw new IllegalArgumentException(
                        "this exception should be caught and swallowed"
                    );
                }
            }
        } .run();
        MatcherAssert.assertThat(count.get(), Matchers.greaterThan(0));
    }

    /**
     * RetryOnFailure can retry when Error types are thrown.
     * @throws Exception If something goes wrong
     */
    @Test
    public void retriesOnError() throws Exception {
        final AtomicInteger count = new AtomicInteger();
        new Runnable() {
            @Override
            @RetryOnFailure(verbose = false, unit = TimeUnit.SECONDS, delay = 1)
            public void run() {
                if (count.incrementAndGet() < 2) {
                    throw new AssertionError("Should be caught and ignored.");
                }
            }
        } .run();
        MatcherAssert.assertThat(count.get(), Matchers.greaterThan(0));
    }

}