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

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Here is the source code for com.google.devtools.build.android.LoggingProfiler.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 com.google.common.base.Preconditions;
import com.google.common.base.Stopwatch;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;

/** Logs timing data to the logger. */
public class LoggingProfiler implements Profiler {

    private final Logger logger = Logger.getLogger(LoggingProfiler.class.getName());
    private final Map<String, Stopwatch> tasks = new HashMap<>();

    private LoggingProfiler() {
    }

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

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

    @Override
    public Profiler recordEndOf(String taskName) {
        Preconditions.checkArgument(tasks.containsKey(taskName));
        final Stopwatch task = tasks.remove(taskName);
        logger.finer(String.format("%s in %ss", taskName, task.elapsed(TimeUnit.MILLISECONDS) / 1000f));
        return this;
    }
}