Home | History | Annotate | Download | only in internal 
      1 /*
      2  * Copyright (C) 2014 Google, Inc.
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  * http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package dagger.producers.internal;
     17 
     18 import com.google.common.util.concurrent.Futures;
     19 import com.google.common.util.concurrent.ListenableFuture;
     20 import com.google.common.util.concurrent.SettableFuture;
     21 import dagger.producers.Producer;
     22 import dagger.producers.monitoring.ProducerMonitor;
     23 import dagger.producers.monitoring.ProducerToken;
     24 import dagger.producers.monitoring.ProductionComponentMonitor;
     25 import java.util.concurrent.ExecutionException;
     26 import javax.inject.Provider;
     27 import org.mockito.Mock;
     28 import org.mockito.Mockito;
     29 import org.mockito.MockitoAnnotations;
     30 import org.junit.Before;
     31 import org.junit.Test;
     32 import org.junit.runner.RunWith;
     33 import org.junit.runners.JUnit4;
     34 
     35 import static com.google.common.truth.Truth.assertThat;
     36 import static org.junit.Assert.fail;
     37 import static org.mockito.Mockito.any;
     38 import static org.mockito.Mockito.verify;
     39 import static org.mockito.Mockito.verifyNoMoreInteractions;
     40 import static org.mockito.Mockito.when;
     41 
     42 /**
     43  * Tests {@link AbstractProducer}.
     44  */
     45 @RunWith(JUnit4.class)
     46 public class AbstractProducerTest {
     47   @Mock private ProductionComponentMonitor componentMonitor;
     48   private ProducerMonitor monitor;
     49   private Provider<ProductionComponentMonitor> componentMonitorProvider;
     50 
     51   @Before
     52   public void initMocks() {
     53     MockitoAnnotations.initMocks(this);
     54     monitor = Mockito.mock(ProducerMonitor.class, Mockito.CALLS_REAL_METHODS);
     55     when(componentMonitor.producerMonitorFor(any(ProducerToken.class))).thenReturn(monitor);
     56     componentMonitorProvider =
     57         new Provider<ProductionComponentMonitor>() {
     58           @Override
     59           public ProductionComponentMonitor get() {
     60             return componentMonitor;
     61           }
     62         };
     63   }
     64 
     65   @Test
     66   public void get_nullPointerException() {
     67     Producer<Object> producer = new DelegateProducer<>(componentMonitorProvider, null);
     68     try {
     69       producer.get();
     70       fail();
     71     } catch (NullPointerException expected) {
     72     }
     73   }
     74 
     75   @Test public void get() throws Exception {
     76     Producer<Integer> producer =
     77         new AbstractProducer<Integer>(componentMonitorProvider, null) {
     78           int i = 0;
     79 
     80           @Override
     81           public ListenableFuture<Integer> compute(ProducerMonitor unusedMonitor) {
     82             return Futures.immediateFuture(i++);
     83           }
     84         };
     85     assertThat(producer.get().get()).isEqualTo(0);
     86     assertThat(producer.get().get()).isEqualTo(0);
     87     assertThat(producer.get().get()).isEqualTo(0);
     88   }
     89 
     90   @Test
     91   public void monitor_success() throws Exception {
     92     SettableFuture<Integer> delegateFuture = SettableFuture.create();
     93     Producer<Integer> producer = new DelegateProducer<>(componentMonitorProvider, delegateFuture);
     94 
     95     ListenableFuture<Integer> future = producer.get();
     96     assertThat(future.isDone()).isFalse();
     97     verify(monitor).addCallbackTo(any(ListenableFuture.class));
     98     delegateFuture.set(-42);
     99     assertThat(future.get()).isEqualTo(-42);
    100     verify(monitor).succeeded(-42);
    101     verifyNoMoreInteractions(monitor);
    102   }
    103 
    104   @Test
    105   public void monitor_failure() throws Exception {
    106     SettableFuture<Integer> delegateFuture = SettableFuture.create();
    107     Producer<Integer> producer = new DelegateProducer<>(componentMonitorProvider, delegateFuture);
    108 
    109     ListenableFuture<Integer> future = producer.get();
    110     assertThat(future.isDone()).isFalse();
    111     verify(monitor).addCallbackTo(any(ListenableFuture.class));
    112     Throwable t = new RuntimeException("monkey");
    113     delegateFuture.setException(t);
    114     try {
    115       future.get();
    116       fail();
    117     } catch (ExecutionException e) {
    118       assertThat(e.getCause()).isSameAs(t);
    119     }
    120     verify(monitor).failed(t);
    121     verifyNoMoreInteractions(monitor);
    122   }
    123 
    124   @Test(expected = NullPointerException.class)
    125   public void monitor_null() throws Exception {
    126     new DelegateProducer<>(null, Futures.immediateFuture(42));
    127   }
    128 
    129   static final class DelegateProducer<T> extends AbstractProducer<T> {
    130     private final ListenableFuture<T> delegate;
    131 
    132     DelegateProducer(
    133         Provider<ProductionComponentMonitor> componentMonitorProvider,
    134         ListenableFuture<T> delegate) {
    135       super(componentMonitorProvider, null);
    136       this.delegate = delegate;
    137     }
    138 
    139     @Override
    140     public ListenableFuture<T> compute(ProducerMonitor unusedMonitor) {
    141       return delegate;
    142     }
    143   }
    144 }
    145