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| 1 | +/* |
| 2 | + * This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt). |
| 3 | + * |
| 4 | + * The MIT License |
| 5 | + * Copyright © 2014-2022 Ilkka Seppälä |
| 6 | + * |
| 7 | + * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 8 | + * of this software and associated documentation files (the "Software"), to deal |
| 9 | + * in the Software without restriction, including without limitation the rights |
| 10 | + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 11 | + * copies of the Software, and to permit persons to whom the Software is |
| 12 | + * furnished to do so, subject to the following conditions: |
| 13 | + * |
| 14 | + * The above copyright notice and this permission notice shall be included in |
| 15 | + * all copies or substantial portions of the Software. |
| 16 | + * |
| 17 | + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 18 | + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 19 | + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 20 | + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 21 | + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 22 | + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 23 | + * THE SOFTWARE. |
| 24 | + */ |
| 25 | +package com.iluwatar.actormodel; |
| 26 | + |
| 27 | +import java.util.concurrent.BlockingQueue; |
| 28 | +import java.util.concurrent.LinkedBlockingQueue; |
| 29 | + |
| 30 | +public abstract class Actor implements Runnable { |
| 31 | + private final BlockingQueue<Message> mailbox = new LinkedBlockingQueue<>(); |
| 32 | + private volatile boolean active = |
| 33 | + true; // always read from main memory and written back to main memory, |
| 34 | + |
| 35 | + // rather than being cached in a thread's local memory. To make it consistent to all Actors |
| 36 | + |
| 37 | + public void send(Message message) { |
| 38 | + mailbox.add(message); // Add message to queue |
| 39 | + } |
| 40 | + |
| 41 | + public void stop() { |
| 42 | + active = false; // Stop the actor loop |
| 43 | + } |
| 44 | + |
| 45 | + @Override |
| 46 | + public void run() { |
| 47 | + while (active) { |
| 48 | + try { |
| 49 | + Message message = mailbox.take(); // Wait for a message |
| 50 | + onReceive(message); // Process it |
| 51 | + } catch (InterruptedException e) { |
| 52 | + Thread.currentThread().interrupt(); |
| 53 | + } |
| 54 | + } |
| 55 | + } |
| 56 | + |
| 57 | + // Child classes must define what to do with a message |
| 58 | + protected abstract void onReceive(Message message); |
| 59 | +} |
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