org.apache.druid.query.MetricsEmittingExecutorService.java Source code

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Here is the source code for org.apache.druid.query.MetricsEmittingExecutorService.java

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/*
 * 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.druid.query;

import com.google.common.util.concurrent.ForwardingListeningExecutorService;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import org.apache.druid.java.util.emitter.service.ServiceEmitter;
import org.apache.druid.java.util.emitter.service.ServiceMetricEvent;

import java.util.concurrent.Callable;

public class MetricsEmittingExecutorService extends ForwardingListeningExecutorService
        implements ExecutorServiceMonitor.MetricEmitter {
    private final ListeningExecutorService delegate;

    public MetricsEmittingExecutorService(ListeningExecutorService delegate,
            ExecutorServiceMonitor executorServiceMonitor) {
        super();
        this.delegate = delegate;
        executorServiceMonitor.add(this);
    }

    @Override
    protected ListeningExecutorService delegate() {
        return delegate;
    }

    @SuppressWarnings("ParameterPackage")
    @Override
    public <T> ListenableFuture<T> submit(Callable<T> tCallable) {
        return delegate.submit(tCallable);
    }

    @Override
    public void execute(Runnable runnable) {
        delegate.execute(runnable);
    }

    @Override
    public void emitMetrics(ServiceEmitter emitter, ServiceMetricEvent.Builder metricBuilder) {
        if (delegate instanceof PrioritizedExecutorService) {
            emitter.emit(metricBuilder.build("segment/scan/pending",
                    ((PrioritizedExecutorService) delegate).getQueueSize()));
        }
    }

}