ViewChecker.java

/*
 * 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 org.apache.sling.discovery.base.commons;

/**
 * A ViewChecker is capable of issuing a heartbeat and
 * subsequently checking the resulting, current view 
 * in the local cluster.
 * <p>
 * This is mostly used as hooks for testing
 */
public interface ViewChecker {

    /**
     * Check the view (without issuing a heartbeat)
     */
    public void checkView();
    
    /**
     * Issue a heartbeat and check the view
     */
    public void heartbeatAndCheckView();

}