in.tum.de.ase.observer.controller.Controller.java Source code

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Here is the source code for in.tum.de.ase.observer.controller.Controller.java

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/*******************************************************************************
 * Copyright 2016 Amit Kumar Mondal
 *
 * 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 in.tum.de.ase.observer.controller;

import java.util.List;

import com.google.common.collect.Lists;

import in.tum.de.ase.observers.api.IObserver;

/**
 * Registers all the observers to trigger asynchronous operations
 *
 * @author AMIT KUMAR MONDAL
 *
 */
public final class Controller {

    /**
     * Singleton Instance
     */
    public static final Controller INSTANCE = new Controller();

    /**
     * Lists of all observers
     */
    private final List<IObserver> observers;

    /**
     * Constructor
     */
    private Controller() {
        this.observers = Lists.newCopyOnWriteArrayList();
    }

    /**
     * Registers the provided observer
     */
    public void addObserver(final IObserver observer) {
        this.observers.add(observer);
    }

    /**
     * Notifies all the registered observers
     */
    public void notifyObservers(final Object value) {
        this.observers.stream().forEach(observer -> observer.trigger(value));
    }

}