modules/api/src/main/java/io/fluo/api/observer/AbstractObserver.java

/*
 * Copyright 2014 Fluo authors (see AUTHORS)
 * 
 * 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 io.fluo.api.observer;

import io.fluo.api.client.TransactionBase;

/**
 * Implemented by users to a watch a {@link io.fluo.api.data.Column} and be notified of changes to
 * the Column via the
 * {@link #process(TransactionBase, io.fluo.api.data.Bytes, io.fluo.api.data.Column)} method.
 * AbstractObserver extends {@link Observer} but provides a default implementation for the
 * {@link #init(Context)} and {@link #close()} method so that they can be optionally implemented by
 * user.
 */
public abstract class AbstractObserver implements Observer {

  @Override
  public void init(Context context) throws Exception {}

  @Override
  public void close() {}
}