/*
 * 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.phoenix.metrics;

import org.apache.commons.configuration2.SubsetConfiguration;
import org.apache.hadoop.metrics2.AbstractMetric;
import org.apache.hadoop.metrics2.MetricsRecord;
import org.apache.hadoop.metrics2.MetricsSink;
import org.apache.phoenix.trace.TracingUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Simple sink that just logs the output of all the metrics that start with
 * {@link org.apache.phoenix.trace.TracingUtils#METRIC_SOURCE_KEY}
 */
public class LoggingSink implements MetricsSink {

  private static final Logger LOGGER = LoggerFactory.getLogger(LoggingSink.class);

  @Override
  public void init(SubsetConfiguration config) {
  }

  @Override
  public void putMetrics(MetricsRecord record) {
    // we could wait until flush, but this is a really lightweight process, so we just write
    // them
    // as soon as we get them
    if (!LOGGER.isDebugEnabled()) {
      return;
    }
    LOGGER.debug("Found record:" + record.name());
    for (AbstractMetric metric : record.metrics()) {
      // just print the metric we care about
      if (metric.name().startsWith(TracingUtils.METRIC_SOURCE_KEY)) {
        LOGGER.debug("\t metric:" + metric);
      }
    }
  }

  @Override
  public void flush() {
  }
}
