net.sf.derquinsej.stats.TimingMapImpl.java Source code

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Here is the source code for net.sf.derquinsej.stats.TimingMapImpl.java

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/*
 * Copyright (C) the original author or authors.
 *
 * 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 net.sf.derquinsej.stats;

import static com.google.common.base.Functions.compose;
import static com.google.common.base.Functions.constant;
import static com.google.common.collect.Maps.transformValues;
import static java.util.Collections.unmodifiableMap;
import static net.sf.derquinsej.stats.Timings.atomicGetter;

import java.util.Map;
import java.util.concurrent.TimeUnit;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.ForwardingMap;

/**
 * Timing map implementation.
 * @author Andres Rodriguez
 * @param <K> The type of keys.
 */
final class TimingMapImpl<K> extends ForwardingMap<K, Timing> implements TimingMap<K> {
    /** Loading cache. */
    private final LoadingCache<K, AtomicTiming> cache;
    /** Unmodifiable view. */
    private final Map<K, Timing> view;

    /**
     * Constructor.
     * @param unit Time unit to use.
     */
    TimingMapImpl(TimeUnit unit) {
        this.cache = CacheBuilder.newBuilder()
                .build(CacheLoader.from(compose(Timings.atomicCreator(), constant(unit))));
        this.view = unmodifiableMap(transformValues(cache.asMap(), atomicGetter()));
    }

    @Override
    protected Map<K, Timing> delegate() {
        return view;
    }

    /*
     * (non-Javadoc)
     * @see net.sf.derquinsej.stats.TimingMap#add(java.lang.Object, long,
     * java.util.concurrent.TimeUnit)
     */
    public Timing add(K key, long time, TimeUnit unit) {
        return cache.getUnchecked(key).add(time, unit).get();
    }

    /*
     * (non-Javadoc)
     * @see net.sf.derquinsej.stats.TimingMap#add(java.lang.Object, java.lang.Number,
     * java.util.concurrent.TimeUnit)
     */
    public Timing add(K key, Number time, TimeUnit unit) {
        return cache.getUnchecked(key).add(time, unit).get();
    }

    /*
     * (non-Javadoc)
     * @see net.sf.derquinsej.stats.TimingMap#add(java.lang.Object, java.lang.Number)
     */
    public Timing add(K key, Number time) {
        return cache.getUnchecked(key).add(time).get();
    }

    /*
     * (non-Javadoc)
     * @see com.google.common.collect.ForwardingMap#clear()
     */
    @Override
    public void clear() {
        cache.invalidateAll();
    }

    /*
     * (non-Javadoc)
     * @see net.sf.derquinsej.stats.TimingMap#add(java.lang.Object, long)
     */
    public Timing add(K key, long time) {
        return cache.getUnchecked(key).add(time).get();
    }

    /*
     * (non-Javadoc)
     * @see com.google.common.collect.ForwardingObject#toString()
     */
    @Override
    public String toString() {
        return cache.asMap().toString();
    }
}