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.groovy.engine; import org.apache.commons.lang3.concurrent.BasicThreadFactory; import org.apache.tinkerpop.gremlin.AbstractGremlinTest; import org.apache.tinkerpop.gremlin.LoadGraphWith; import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource; import org.apache.tinkerpop.gremlin.structure.Graph; import org.junit.Test; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.TimeUnit; import java.util.concurrent.atomic.AtomicInteger; import static org.junit.Assert.assertEquals; /** * @author Stephen Mallette (http://stephen.genoprime.com) */ public class GremlinExecutorOverGraphTest extends AbstractGremlinTest { private final BasicThreadFactory testingThreadFactory = new BasicThreadFactory.Builder() .namingPattern("test-gremlin-executor-%d").build(); @Test @LoadGraphWith(LoadGraphWith.GraphData.MODERN) public void shouldAllowTraversalToIterateInDifferentThreadThanOriginallyEvaluatedWithAutoCommit() throws Exception { // this test sort of simulates Gremlin Server interaction where a Traversal is eval'd in one Thread, but // then iterated in another. note that Gremlin Server configures the script engine to auto-commit // after evaluation. this basically tests the state of the Gremlin Server GremlinExecutor when // being used in sessionless mode final ExecutorService evalExecutor = Executors.newSingleThreadExecutor(testingThreadFactory); final GremlinExecutor gremlinExecutor = GremlinExecutor.build().afterSuccess(b -> { final GraphTraversalSource g = (GraphTraversalSource) b.get("g"); if (g.getGraph().features().graph().supportsTransactions()) g.tx().commit(); }).executorService(evalExecutor).create(); final Map<String, Object> bindings = new HashMap<>(); bindings.put("g", g); final AtomicInteger vertexCount = new AtomicInteger(0); final ExecutorService iterationExecutor = Executors.newSingleThreadExecutor(testingThreadFactory); gremlinExecutor.eval("g.V().out()", bindings).thenAcceptAsync(o -> { final Iterator itty = (Iterator) o; itty.forEachRemaining(v -> vertexCount.incrementAndGet()); }, iterationExecutor).join(); assertEquals(6, vertexCount.get()); gremlinExecutor.close(); evalExecutor.shutdown(); evalExecutor.awaitTermination(30000, TimeUnit.MILLISECONDS); iterationExecutor.shutdown(); iterationExecutor.awaitTermination(30000, TimeUnit.MILLISECONDS); } @Test @LoadGraphWith(LoadGraphWith.GraphData.MODERN) public void shouldAllowTraversalToIterateInDifferentThreadThanOriginallyEvaluatedWithoutAutoCommit() throws Exception { // this test sort of simulates Gremlin Server interaction where a Traversal is eval'd in one Thread, but // then iterated in another. this basically tests the state of the Gremlin Server GremlinExecutor when // being used in session mode final ExecutorService evalExecutor = Executors.newSingleThreadExecutor(testingThreadFactory); final GremlinExecutor gremlinExecutor = GremlinExecutor.build().executorService(evalExecutor).create(); final Map<String, Object> bindings = new HashMap<>(); bindings.put("g", g); final AtomicInteger vertexCount = new AtomicInteger(0); final ExecutorService iterationExecutor = Executors.newSingleThreadExecutor(testingThreadFactory); gremlinExecutor.eval("g.V().out()", bindings).thenAcceptAsync(o -> { final Iterator itty = (Iterator) o; itty.forEachRemaining(v -> vertexCount.incrementAndGet()); }, iterationExecutor).join(); assertEquals(6, vertexCount.get()); gremlinExecutor.close(); evalExecutor.shutdown(); evalExecutor.awaitTermination(30000, TimeUnit.MILLISECONDS); iterationExecutor.shutdown(); iterationExecutor.awaitTermination(30000, TimeUnit.MILLISECONDS); } }