| /* |
| * 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.process.traversal.step.util; |
| |
| import org.apache.tinkerpop.gremlin.process.computer.MemoryComputeKey; |
| import org.apache.tinkerpop.gremlin.process.traversal.Step; |
| import org.apache.tinkerpop.gremlin.process.traversal.Traversal; |
| import org.apache.tinkerpop.gremlin.process.traversal.Traverser; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.MemoryComputing; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.Profiling; |
| import org.apache.tinkerpop.gremlin.process.traversal.util.MutableMetrics; |
| import org.apache.tinkerpop.gremlin.process.traversal.util.TraversalHelper; |
| |
| import java.io.Serializable; |
| import java.util.NoSuchElementException; |
| import java.util.function.BinaryOperator; |
| |
| /** |
| * @author Bob Briody (http://bobbriody.com) |
| */ |
| public final class ProfileStep<S> extends AbstractStep<S, S> implements MemoryComputing<MutableMetrics> { // pseudo GraphComputing but local traversals are "GraphComputing" |
| private MutableMetrics metrics; |
| private boolean onGraphComputer = false; |
| |
| public ProfileStep(final Traversal.Admin traversal) { |
| super(traversal); |
| } |
| |
| public MutableMetrics getMetrics() { |
| return metrics; |
| } |
| |
| @Override |
| public Traverser.Admin<S> next() { |
| Traverser.Admin<S> start = null; |
| this.initializeIfNeeded(); |
| this.metrics.start(); |
| try { |
| start = super.next(); |
| return start; |
| } finally { |
| if (start != null) { |
| this.metrics.finish(start.bulk()); |
| if (this.onGraphComputer) { |
| this.getTraversal().getSideEffects().add(this.getId(), this.metrics); |
| this.metrics = null; |
| } |
| } else { |
| this.metrics.stop(); |
| if (this.onGraphComputer) { |
| this.getTraversal().getSideEffects().add(this.getId(), this.metrics); |
| this.metrics = null; |
| } |
| } |
| } |
| } |
| |
| @Override |
| public boolean hasNext() { |
| initializeIfNeeded(); |
| this.metrics.start(); |
| boolean ret = super.hasNext(); |
| this.metrics.stop(); |
| return ret; |
| } |
| |
| @Override |
| protected Traverser.Admin<S> processNextStart() throws NoSuchElementException { |
| return this.starts.next(); |
| } |
| |
| private void initializeIfNeeded() { |
| if (null == this.metrics) { |
| this.onGraphComputer = TraversalHelper.onGraphComputer(this.getTraversal()); |
| this.metrics = new MutableMetrics(this.getPreviousStep().getId(), this.getPreviousStep().toString()); |
| final Step<?, S> previousStep = this.getPreviousStep(); |
| if (previousStep instanceof Profiling) |
| ((Profiling) previousStep).setMetrics(this.metrics); |
| } |
| } |
| |
| @Override |
| public MemoryComputeKey<MutableMetrics> getMemoryComputeKey() { |
| return MemoryComputeKey.of(this.getId(), ProfileBiOperator.instance(), false, true); |
| } |
| |
| @Override |
| public ProfileStep<S> clone() { |
| final ProfileStep<S> clone = (ProfileStep<S>) super.clone(); |
| clone.metrics = null; |
| return clone; |
| } |
| |
| ///// |
| |
| public static class ProfileBiOperator implements BinaryOperator<MutableMetrics>, Serializable { |
| |
| private static final ProfileBiOperator INSTANCE = new ProfileBiOperator(); |
| |
| @Override |
| public MutableMetrics apply(final MutableMetrics metricsA, final MutableMetrics metricsB) { |
| metricsA.aggregate(metricsB); |
| return metricsA; |
| } |
| |
| public static final ProfileBiOperator instance() { |
| return INSTANCE; |
| } |
| } |
| } |