ratpack.dropwizard.metrics.internal.UnpooledByteBufAllocatorMetricSet.java Source code

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Here is the source code for ratpack.dropwizard.metrics.internal.UnpooledByteBufAllocatorMetricSet.java

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/*
 * Copyright 2018 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 ratpack.dropwizard.metrics.internal;

import com.codahale.metrics.Gauge;
import com.codahale.metrics.Metric;
import com.codahale.metrics.MetricSet;
import io.netty.buffer.ByteBufAllocatorMetric;
import io.netty.buffer.UnpooledByteBufAllocator;

import java.util.HashMap;
import java.util.Map;

/**
 * Metric set exposing {@link UnpooledByteBufAllocator} metrics about memory allocations.
 */
public class UnpooledByteBufAllocatorMetricSet implements MetricSet {

    private final UnpooledByteBufAllocator unpooledByteBufAllocator;
    private final Map<String, Metric> metrics;

    /**
     * Metric set constructor
     *
     * @param unpooledByteBufAllocator allocator which would expose metrics
     */
    public UnpooledByteBufAllocatorMetricSet(UnpooledByteBufAllocator unpooledByteBufAllocator) {
        this.unpooledByteBufAllocator = unpooledByteBufAllocator;
        this.metrics = new HashMap<>();

        initMetrics();
    }

    private void initMetrics() {
        final ByteBufAllocatorMetric metric = unpooledByteBufAllocator.metric();

        metrics.put("usedDirectMemory", (Gauge<Long>) () -> metric.usedDirectMemory());
        metrics.put("usedHeapMemory", (Gauge<Long>) () -> metric.usedHeapMemory());
    }

    @Override
    public Map<String, Metric> getMetrics() {
        return metrics;
    }
}