116 lines
3.4 KiB
Java
116 lines
3.4 KiB
Java
// Copyright 2011, 2012 Tony Garnock-Jones <tonygarnockjones@gmail.com>.
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//
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// This file is part of Hop.
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//
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// Hop is free software: you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Hop is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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// License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Hop. If not, see <http://www.gnu.org/licenses/>.
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//
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package hop;
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import java.io.Flushable;
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import java.io.IOException;
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import java.lang.ref.WeakReference;
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import java.util.*;
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/**
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*/
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public class NodeContainer implements Flushable {
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public String _name;
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public Map<String, WeakReference<Node>> _directory;
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public NodeContainer() {
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this(UUID.randomUUID().toString());
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}
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public NodeContainer(String name) {
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_name = name;
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_directory = new Hashtable<String, WeakReference<Node>>();
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}
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public String getName() {
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return _name;
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}
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public synchronized boolean bind(String name, Node n) {
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WeakReference<Node> ref = _directory.get(name);
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if (ref != null && ref.get() != null) {
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return false;
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}
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ref = new WeakReference<Node>(n);
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_directory.put(name, ref);
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return true;
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}
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public synchronized boolean unbind(String name) {
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if (!_directory.containsKey(name))
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return false;
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_directory.remove(name);
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return true;
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}
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public void flush() throws IOException {
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ArrayList<Flushable> fs = new ArrayList<Flushable>();
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synchronized (this) {
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for (Map.Entry<String, WeakReference<Node>> e : _directory.entrySet()) {
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Node n = e.getValue().get();
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if (n instanceof Flushable) {
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fs.add((Flushable) n);
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}
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}
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}
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for (Flushable f : fs) {
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f.flush();
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}
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}
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public void flush(String name) throws IOException {
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Flushable f;
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synchronized (this) {
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WeakReference<Node> ref = _directory.get(name);
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if (ref == null) return;
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Node n = ref.get();
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if (n == null) return;
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if (!(n instanceof Flushable)) return;
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f = ((Flushable) n);
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}
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f.flush();
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}
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public synchronized void unbindReferencesTo(Node n) {
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for (Map.Entry<String, WeakReference<Node>> e : _directory.entrySet()) {
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if (e.getValue().get() == n) {
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_directory.remove(e.getKey());
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}
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}
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}
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public synchronized Node lookup(String name) {
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WeakReference<Node> r = _directory.get(name);
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return (r == null) ? null : r.get();
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}
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public boolean post(String sink, Object name, Object message, Object token) {
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return send(sink, SexpMessage.post(name, message, token));
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}
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public boolean send(String name, Object message) {
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Node n = lookup(name);
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if (n == null) {
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System.err.println("Warning: sending to nonexistent node " + name + "; message " + message);
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return false;
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}
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n.handle(message);
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return true;
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}
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}
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