/**
 * 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 backtype.storm.metric.api;

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

@SuppressWarnings("rawtypes")
public class MultiReducedMetric implements IMetric {
  private Map<String, ReducedMetric> value = new HashMap<>();
  private IReducer reducer;

  public MultiReducedMetric(IReducer reducer) {
    this.reducer = reducer;
  }

  public ReducedMetric scope(String key) {
    ReducedMetric val = value.get(key);
    if (val == null) {
      value.put(key, val = new ReducedMetric(reducer));
    }
    return val;
  }

  public Object getValueAndReset() {
    Map<String, Object> ret = new HashMap<>();
    for (Map.Entry<String, ReducedMetric> e : value.entrySet()) {
      Object val = e.getValue().getValueAndReset();
      if (val != null) {
        ret.put(e.getKey(), val);
      }
    }
    return ret;
  }
}