Source code

001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.io.watcher;
020
021import org.apache.reef.annotations.Unstable;
022import org.apache.reef.tang.annotations.DefaultImplementation;
023
024/**
025 * Write events to a certain destination.
026 */
027@Unstable
028@DefaultImplementation(LogEventStream.class)
029public interface EventStream {
030
031  /**
032   * Write an eventRecord with specific type. This should be thread-safe
033   * since multiple event handlers can concurrently call the method.
034   *
035   * @param type a event type
036   * @param jsonEncodedEvent an event encoded as json
037   */
038  void onEvent(EventType type, String jsonEncodedEvent);
039
040}