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Druid emitter extension to convert druid metric to Dropwizard metrics

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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.emitter.dropwizard;

import com.codahale.metrics.MetricRegistry;
import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import org.apache.druid.emitter.dropwizard.reporters.DropwizardConsoleReporter;
import org.apache.druid.emitter.dropwizard.reporters.DropwizardJMXReporter;

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type")
@JsonSubTypes(value = {
    @JsonSubTypes.Type(name = "console", value = DropwizardConsoleReporter.class),
    @JsonSubTypes.Type(name = "jmx", value = DropwizardJMXReporter.class),
})
public interface DropwizardReporter
{

  void start(MetricRegistry metricRegistry);

  /**
   *  Used for reporters that choose to buffer events to trigger flushing of buffered events.
   *  It should be a non-blocking operation.
   */
  void flush();

  void close();
}