Counter.java

// =================================================================================================
// Copyright 2013 Twitter, Inc.
// -------------------------------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this work except in compliance with the License.
// You may obtain a copy of the License in the LICENSE file, or 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 com.twitter.common.metrics;

/**
 * A counter that can only be incremented.
 */
public interface Counter {
  /**
   * Returns the name of the Counter.
   */
  String getName();

  /**
   * Increment the counter by 1, equivalent to add(1L).
   */
  void increment();

  /**
   * Increment the counter by an arbitrary value.
   */
  void add(long n);
}