State.java

// Copyright 2016 Twitter. All rights reserved.
//
// Licensed 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 com.twitter.heron.api.state;

import java.io.Serializable;
import java.util.Map;

/**
 * State represents the state interface as seen by stateful bolts and spouts.
 * In Heron, state gives a notional Key/Value interface along with the
 * ability to iterate over the key/values
 */
public interface State<K extends Serializable, V extends Serializable> extends Map<K, V> {
}