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/*-
* ============LICENSE_START=======================================================
* Integrity Monitor
* ================================================================================
* Copyright (C) 2017, 2020 AT&T Intellectual Property. 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.im;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/*
* This is implementing the Observer interface to make it specific for
* state management.
*
* It saves the StateManagement object and a String message that is
* passed in when notifyObservers is called by the Observable
* host class.
*
* It provides an abstract method for handling the state change
* so this class must be overwritten and made concrete for the
* Observer who is monitoring the state changes.
*/
/**
* StateChangeNotifier class implements the Observer pattern and is used to distribute state change
* notifications to any entity that registers a derived class with an instance of the
* StateManagement class.
*
*/
public class StateChangeNotifier {
private static final Logger logger = LoggerFactory.getLogger(StateChangeNotifier.class);
// The observable class
StateManagement stateManagement;
// A string argument passed by the observable class when
// StateManagement:notifyObservers(String changed) is called
String message;
/**
* Invoked to indicate that something observed by this notifier has changed.
* @param observable item that has changed
* @param changed message indicating what change was made
*/
public void update(StateManagement observable, String changed) {
this.stateManagement = observable;
this.message = changed;
handleStateChange();
}
/**
* Handle state change.
*/
public void handleStateChange() {
if (logger.isDebugEnabled()) {
logger.debug("handleStateChange, message: {}", this.message);
}
}
public StateManagement getStateManagement() {
return stateManagement;
}
public String getMessage() {
return message;
}
}
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