87 lines
1.7 KiB
Java
87 lines
1.7 KiB
Java
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package net.sourceforge.tuned;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import javax.swing.SwingUtilities;
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public class MessageBus {
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private static final MessageBus instance = new MessageBus();
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public static MessageBus getDefault() {
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return instance;
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}
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private final Map<String, List<MessageHandler>> handlers = new HashMap<String, List<MessageHandler>>() {
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@Override
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public List<MessageHandler> get(Object key) {
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return super.get(key.toString().toLowerCase());
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}
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@Override
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public List<MessageHandler> put(String key, List<MessageHandler> value) {
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return super.put(key.toLowerCase(), value);
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}
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};
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private MessageBus() {
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}
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public synchronized void addMessageHandler(String topic, MessageHandler handler) {
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List<MessageHandler> list = handlers.get(topic);
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if (list == null) {
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list = new ArrayList<MessageHandler>(3);
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handlers.put(topic, list);
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}
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list.add(handler);
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}
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public synchronized void removeMessageHandler(String topic, MessageHandler handler) {
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List<MessageHandler> list = handlers.get(topic);
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if (list != null) {
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list.remove(handler);
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}
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}
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public synchronized MessageHandler[] getHandlers(String topic) {
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List<MessageHandler> list = handlers.get(topic);
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if (list == null)
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return new MessageHandler[0];
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return list.toArray(new MessageHandler[0]);
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}
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public void publish(final String topic, final String... messages) {
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SwingUtilities.invokeLater(new Runnable() {
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@Override
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public void run() {
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for (MessageHandler handler : getHandlers(topic)) {
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handler.handle(topic, messages);
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}
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}
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});
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}
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}
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