Java tutorial
/* * 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.tinkerpop.gremlin.driver; import org.apache.commons.lang.exception.ExceptionUtils; import org.apache.tinkerpop.gremlin.process.remote.traversal.DefaultRemoteTraverser; import org.apache.tinkerpop.gremlin.process.traversal.step.util.BulkSet; import org.junit.Test; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Set; import java.util.concurrent.CompletableFuture; import java.util.concurrent.CountDownLatch; import java.util.concurrent.TimeUnit; import java.util.concurrent.atomic.AtomicInteger; import static org.hamcrest.CoreMatchers.is; import static org.hamcrest.MatcherAssert.assertThat; import static org.hamcrest.Matchers.greaterThan; import static org.junit.Assert.assertEquals; import static org.junit.Assert.fail; /** * @author Stephen Mallette (http://stephen.genoprime.com) */ public class ResultQueueTest extends AbstractResultQueueTest { @Test public void shouldGetSizeUntilError() throws Exception { final Thread t = addToQueue(100, 10, true, false, 1); try { assertThat(resultQueue.size(), is(greaterThan(0))); assertThat(readCompleted.isDone(), is(false)); final Exception theProblem = new Exception(); resultQueue.markError(theProblem); assertThat(readCompleted.isDone(), is(true)); try { resultQueue.size(); fail("Should have thrown an exception"); } catch (Exception ex) { assertEquals(theProblem, ex.getCause()); } } finally { t.interrupt(); } } @Test public void shouldBeEmptyThenNotEmpty() { assertThat(resultQueue.isEmpty(), is(true)); resultQueue.add(new Result("test")); assertThat(resultQueue.isEmpty(), is(false)); } @Test public void shouldNotBeEmptyUntilError() throws Exception { final Thread t = addToQueue(100, 10, true, false, 1); try { assertThat(resultQueue.isEmpty(), is(false)); assertThat(readCompleted.isDone(), is(false)); final Exception theProblem = new Exception(); resultQueue.markError(theProblem); assertThat(readCompleted.isDone(), is(true)); try { resultQueue.isEmpty(); fail("Should have thrown an exception"); } catch (Exception ex) { assertEquals(theProblem, ex.getCause()); } } finally { t.interrupt(); } } @Test public void shouldDrainUntilError() throws Exception { final Thread t = addToQueue(100, 10, true, false, 1); try { assertThat(resultQueue.isEmpty(), is(false)); final List<Result> drain = new ArrayList<>(); resultQueue.drainTo(drain); assertThat(drain.size(), is(greaterThan(0))); assertThat(readCompleted.isDone(), is(false)); // make sure some more items get added to the queue before assert TimeUnit.MILLISECONDS.sleep(100); assertThat(resultQueue.isEmpty(), is(false)); assertThat(readCompleted.isDone(), is(false)); final Exception theProblem = new Exception(); resultQueue.markError(theProblem); assertThat(readCompleted.isDone(), is(true)); try { resultQueue.drainTo(new ArrayList<>()); fail("Should have thrown an exception"); } catch (Exception ex) { assertEquals(theProblem, ex.getCause()); } } finally { t.interrupt(); } } @Test public void shouldAwaitEverythingAndFlushOnMarkCompleted() throws Exception { final CompletableFuture<List<Result>> future = resultQueue.await(4); resultQueue.add(new Result("test1")); resultQueue.add(new Result("test2")); resultQueue.add(new Result("test3")); assertThat(future.isDone(), is(false)); resultQueue.markComplete(); assertThat(future.isDone(), is(true)); final List<Result> results = future.get(); assertEquals("test1", results.get(0).getString()); assertEquals("test2", results.get(1).getString()); assertEquals("test3", results.get(2).getString()); assertEquals(3, results.size()); assertThat(resultQueue.isEmpty(), is(true)); } @Test public void shouldAwaitFailTheFutureOnMarkError() throws Exception { final CompletableFuture<List<Result>> future = resultQueue.await(4); resultQueue.add(new Result("test1")); resultQueue.add(new Result("test2")); resultQueue.add(new Result("test3")); assertThat(future.isDone(), is(false)); resultQueue.markError(new Exception("no worky")); assertThat(future.isDone(), is(true)); try { future.get(); } catch (Exception ex) { final Throwable t = ExceptionUtils.getRootCause(ex); assertEquals("no worky", t.getMessage()); } } @Test public void shouldAwaitToExpectedValueAndDrainOnAdd() throws Exception { final CompletableFuture<List<Result>> future = resultQueue.await(3); resultQueue.add(new Result("test1")); resultQueue.add(new Result("test2")); // shouldn't complete until the third item is in play assertThat(future.isDone(), is(false)); resultQueue.add(new Result("test3")); final List<Result> results = future.get(); assertEquals("test1", results.get(0).getString()); assertEquals("test2", results.get(1).getString()); assertEquals("test3", results.get(2).getString()); assertEquals(3, results.size()); assertThat(resultQueue.isEmpty(), is(true)); } @Test public void shouldAwaitMultipleToExpectedValueAndDrainOnAdd() throws Exception { final CompletableFuture<List<Result>> future1 = resultQueue.await(3); final CompletableFuture<List<Result>> future2 = resultQueue.await(1); resultQueue.add(new Result("test1")); resultQueue.add(new Result("test2")); // shouldn't complete the first future until the third item is in play assertThat(future1.isDone(), is(false)); assertThat(future2.isDone(), is(false)); resultQueue.add(new Result("test3")); final List<Result> results1 = future1.get(); assertEquals("test1", results1.get(0).getString()); assertEquals("test2", results1.get(1).getString()); assertEquals("test3", results1.get(2).getString()); assertEquals(3, results1.size()); assertThat(future1.isDone(), is(true)); assertThat(future2.isDone(), is(false)); resultQueue.add(new Result("test4")); assertThat(future1.isDone(), is(true)); assertThat(future2.isDone(), is(true)); final List<Result> results2 = future2.get(); assertEquals("test4", results2.get(0).getString()); assertEquals(1, results2.size()); assertThat(resultQueue.isEmpty(), is(true)); } @Test public void shouldAwaitToExpectedValueAndDrainOnAwait() throws Exception { resultQueue.add(new Result("test1")); resultQueue.add(new Result("test2")); resultQueue.add(new Result("test3")); final CompletableFuture<List<Result>> future = resultQueue.await(3); assertThat(future.isDone(), is(true)); final List<Result> results = future.get(); assertEquals("test1", results.get(0).getString()); assertEquals("test2", results.get(1).getString()); assertEquals("test3", results.get(2).getString()); assertEquals(3, results.size()); assertThat(resultQueue.isEmpty(), is(true)); } @Test public void shouldAwaitToReadCompletedAndDrainOnAwait() throws Exception { resultQueue.add(new Result("test1")); resultQueue.add(new Result("test2")); resultQueue.add(new Result("test3")); resultQueue.markComplete(); // you might want 30 but there are only three final CompletableFuture<List<Result>> future = resultQueue.await(30); assertThat(future.isDone(), is(true)); final List<Result> results = future.get(); assertEquals("test1", results.get(0).getString()); assertEquals("test2", results.get(1).getString()); assertEquals("test3", results.get(2).getString()); assertEquals(3, results.size()); assertThat(resultQueue.isEmpty(), is(true)); } @Test public void shouldDrainAsItemsArrive() throws Exception { final Thread t = addToQueue(1000, 1, true); try { final AtomicInteger count1 = new AtomicInteger(0); final AtomicInteger count2 = new AtomicInteger(0); final AtomicInteger count3 = new AtomicInteger(0); final CountDownLatch latch = new CountDownLatch(3); resultQueue.await(500).thenAcceptAsync(r -> { count1.set(r.size()); latch.countDown(); }); resultQueue.await(150).thenAcceptAsync(r -> { count2.set(r.size()); latch.countDown(); }); resultQueue.await(350).thenAcceptAsync(r -> { count3.set(r.size()); latch.countDown(); }); assertThat(latch.await(3000, TimeUnit.MILLISECONDS), is(true)); assertEquals(500, count1.get()); assertEquals(150, count2.get()); assertEquals(350, count3.get()); assertThat(resultQueue.isEmpty(), is(true)); } finally { t.interrupt(); } } @Test public void shouldHandleBulkSetSideEffects() throws Exception { final CompletableFuture<List<Result>> o = resultQueue.await(1); assertThat(o.isDone(), is(false)); resultQueue.addSideEffect(Tokens.VAL_AGGREGATE_TO_BULKSET, new DefaultRemoteTraverser<>("brian", 2)); assertThat(o.isDone(), is(false)); resultQueue.addSideEffect(Tokens.VAL_AGGREGATE_TO_BULKSET, new DefaultRemoteTraverser<>("brian", 2)); assertThat(o.isDone(), is(false)); resultQueue.addSideEffect(Tokens.VAL_AGGREGATE_TO_BULKSET, new DefaultRemoteTraverser<>("belinda", 6)); assertThat(o.isDone(), is(false)); resultQueue.markComplete(); assertThat(o.isDone(), is(true)); final BulkSet<String> bulkSet = o.get().get(0).get(BulkSet.class); assertEquals(4, bulkSet.get("brian")); assertEquals(6, bulkSet.get("belinda")); } @Test public void shouldHandleListSideEffects() throws Exception { final CompletableFuture<List<Result>> o = resultQueue.await(1); assertThat(o.isDone(), is(false)); resultQueue.addSideEffect(Tokens.VAL_AGGREGATE_TO_LIST, "stephen"); assertThat(o.isDone(), is(false)); resultQueue.addSideEffect(Tokens.VAL_AGGREGATE_TO_LIST, "daniel"); assertThat(o.isDone(), is(false)); resultQueue.addSideEffect(Tokens.VAL_AGGREGATE_TO_LIST, "dave"); assertThat(o.isDone(), is(false)); resultQueue.markComplete(); assertThat(o.isDone(), is(true)); final List<String> list = o.get().get(0).get(ArrayList.class); assertEquals("stephen", list.get(0)); assertEquals("daniel", list.get(1)); assertEquals("dave", list.get(2)); } @Test public void shouldHandleSetSideEffects() throws Exception { final CompletableFuture<List<Result>> o = resultQueue.await(1); assertThat(o.isDone(), is(false)); resultQueue.addSideEffect(Tokens.VAL_AGGREGATE_TO_SET, "stephen"); assertThat(o.isDone(), is(false)); resultQueue.addSideEffect(Tokens.VAL_AGGREGATE_TO_SET, "daniel"); assertThat(o.isDone(), is(false)); resultQueue.addSideEffect(Tokens.VAL_AGGREGATE_TO_SET, "dave"); assertThat(o.isDone(), is(false)); resultQueue.markComplete(); assertThat(o.isDone(), is(true)); final Set<String> set = o.get().get(0).get(HashSet.class); assertThat(set.contains("stephen"), is(true)); assertThat(set.contains("daniel"), is(true)); assertThat(set.contains("dave"), is(true)); } @Test public void shouldHandleMapSideEffects() throws Exception { final CompletableFuture<List<Result>> o = resultQueue.await(1); assertThat(o.isDone(), is(false)); final Map<String, String> m = new HashMap<>(); m.put("s", "stephen"); m.put("m", "marko"); m.put("d", "daniel"); m.entrySet().forEach(e -> { resultQueue.addSideEffect(Tokens.VAL_AGGREGATE_TO_MAP, e); assertThat(o.isDone(), is(false)); }); resultQueue.markComplete(); assertThat(o.isDone(), is(true)); final Map<String, String> list = o.get().get(0).get(HashMap.class); assertEquals("stephen", list.get("s")); assertEquals("daniel", list.get("d")); assertEquals("marko", list.get("m")); } @Test public void shouldHandleNotAggregateSideEffects() throws Exception { final CompletableFuture<List<Result>> o = resultQueue.await(1); assertThat(o.isDone(), is(false)); final Map<String, String> m = new HashMap<>(); m.put("s", "stephen"); m.put("m", "marko"); m.put("d", "daniel"); resultQueue.addSideEffect(Tokens.VAL_AGGREGATE_TO_NONE, m); resultQueue.markComplete(); assertThat(o.isDone(), is(true)); final Map<String, String> list = o.get().get(0).get(HashMap.class); assertEquals("stephen", list.get("s")); assertEquals("daniel", list.get("d")); assertEquals("marko", list.get("m")); } }