com.google.devtools.build.android.InMemoryProfiler.java Source code

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Here is the source code for com.google.devtools.build.android.InMemoryProfiler.java

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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// Licensed 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 com.google.devtools.build.android;

import static java.util.stream.Collectors.joining;

import com.google.common.base.Preconditions;
import com.google.common.base.Stopwatch;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/** Logs timing data to an in memory list that can be dumped. */
public class InMemoryProfiler implements Profiler {

    private final Map<String, Stopwatch> tasks = new HashMap<>();
    private final List<Timing> report = new ArrayList<>();

    private InMemoryProfiler() {
    }

    public static InMemoryProfiler createAndStart(String taskName) {
        final InMemoryProfiler profiler = new InMemoryProfiler();
        return profiler.startTask(taskName);
    }

    @Override
    public InMemoryProfiler startTask(String taskName) {
        Preconditions.checkArgument(!tasks.containsKey(taskName));
        tasks.put(taskName, Stopwatch.createStarted());
        return this;
    }

    @Override
    public InMemoryProfiler recordEndOf(String taskName) {
        Preconditions.checkArgument(tasks.containsKey(taskName));
        final Stopwatch task = tasks.remove(taskName);
        report.add(new Timing(taskName, task.elapsed().toMillis() / 1000f));
        return this;
    }

    public String asTimingReport() {
        return report.stream().map(Timing::toString).collect(joining("\n"));
    }

    static final class Timing {

        private final String taskName;
        private final float seconds;

        Timing(String taskName, float seconds) {
            this.taskName = taskName;
            this.seconds = seconds;
        }

        @Override
        public String toString() {
            return String.format("%s in %,.2fs", taskName, seconds);
        }
    }
}