| /* |
| * 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. |
| */ |
| package org.apache.beam.runners.reference; |
| |
| import static org.hamcrest.MatcherAssert.assertThat; |
| import static org.hamcrest.Matchers.is; |
| import static org.junit.Assert.fail; |
| |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import org.apache.beam.runners.reference.CloseableResource.CloseException; |
| import org.junit.Rule; |
| import org.junit.Test; |
| import org.junit.rules.ExpectedException; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** Tests for {@link CloseableResource}. */ |
| @RunWith(JUnit4.class) |
| public class CloseableResourceTest { |
| @Rule public ExpectedException thrown = ExpectedException.none(); |
| |
| @Test |
| public void alwaysReturnsSameResource() { |
| Foo foo = new Foo(); |
| CloseableResource<Foo> resource = CloseableResource.of(foo, ignored -> {}); |
| assertThat(resource.get(), is(foo)); |
| assertThat(resource.get(), is(foo)); |
| } |
| |
| @Test |
| public void callsCloser() throws Exception { |
| AtomicBoolean closed = new AtomicBoolean(false); |
| try (CloseableResource<Foo> ignored = |
| CloseableResource.of(new Foo(), foo -> closed.set(true))) { |
| // Do nothing. |
| } |
| assertThat(closed.get(), is(true)); |
| } |
| |
| @Test |
| public void wrapsExceptionsInCloseException() throws Exception { |
| Exception wrapped = new Exception(); |
| thrown.expect(CloseException.class); |
| thrown.expectCause(is(wrapped)); |
| try (CloseableResource<Foo> ignored = |
| CloseableResource.of( |
| new Foo(), |
| foo -> { |
| throw wrapped; |
| })) { |
| // Do nothing. |
| } |
| } |
| |
| @Test |
| public void transferReleasesCloser() throws Exception { |
| try (CloseableResource<Foo> foo = |
| CloseableResource.of( |
| new Foo(), unused -> fail("Transferred resource should not be closed"))) { |
| foo.transfer(); |
| } |
| } |
| |
| @Test |
| public void transferMovesOwnership() throws Exception { |
| AtomicBoolean closed = new AtomicBoolean(false); |
| CloseableResource<Foo> original = CloseableResource.of(new Foo(), unused -> closed.set(true)); |
| CloseableResource<Foo> transferred = original.transfer(); |
| transferred.close(); |
| assertThat(closed.get(), is(true)); |
| } |
| |
| @Test |
| public void cannotTransferClosed() throws Exception { |
| CloseableResource<Foo> foo = CloseableResource.of(new Foo(), unused -> {}); |
| foo.close(); |
| thrown.expect(IllegalStateException.class); |
| foo.transfer(); |
| } |
| |
| @Test |
| public void cannotTransferTwice() { |
| CloseableResource<Foo> foo = CloseableResource.of(new Foo(), unused -> {}); |
| foo.transfer(); |
| thrown.expect(IllegalStateException.class); |
| foo.transfer(); |
| } |
| |
| private static class Foo {} |
| } |