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+/* VoidPluginCallRequest -- represent Java-to-JavaScript requests
+ Copyright (C) 2008 Red Hat
+
+This file is part of IcedTea.
+
+IcedTea is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+IcedTea is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with IcedTea; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+package sun.applet;
+
+import java.util.ArrayList;
+import java.util.Hashtable;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.Set;
+
+class PluginMessageConsumer {
+
+ private static int MAX_PARALLEL_INITS = 1;
+
+ // Each initialization requires 5 responses (tag, handle, width, proxy, cookie)
+ // before the message stack unlocks/collapses. This works out well because we
+ // want to allow upto 5 parallel tasks anyway
+ private static int MAX_WORKERS = MAX_PARALLEL_INITS*4;
+ private static int PRIORITY_WORKERS = MAX_PARALLEL_INITS*2;
+
+ private static Hashtable<Integer, PluginMessageHandlerWorker> initWorkers = new Hashtable<Integer, PluginMessageHandlerWorker>(2);
+
+ LinkedList<String> readQueue = new LinkedList<String>();
+ private static LinkedList<String> priorityWaitQueue = new LinkedList<String>();
+ ArrayList<PluginMessageHandlerWorker> workers = new ArrayList<PluginMessageHandlerWorker>();
+ PluginStreamHandler streamHandler = null;
+ AppletSecurity as;
+ ConsumerThread consumerThread = new ConsumerThread();
+ private static ArrayList<Integer> processedIds = new ArrayList<Integer>();
+
+ /**
+ * Registers a reference to wait for. Responses to registered priority
+ * references get handled by priority worker if normal workers are busy.
+ *
+ * @param reference The reference to give priority to
+ */
+ public static void registerPriorityWait(Long reference) {
+ PluginDebug.debug("Registering priority for reference " + reference);
+ registerPriorityWait("reference " + reference.toString());
+ }
+
+ /**
+ * Registers a string to wait for.
+ *
+ * @param searchString the string to look for in a response
+ */
+ public static void registerPriorityWait(String searchString) {
+ PluginDebug.debug("Registering priority for string " + searchString);
+ synchronized (priorityWaitQueue) {
+ if (!priorityWaitQueue.contains(searchString))
+ priorityWaitQueue.add(searchString);
+ }
+ }
+
+ /**
+ * Unregisters a priority reference to wait for.
+ *
+ * @param reference The reference to remove
+ */
+ public static void unRegisterPriorityWait(Long reference) {
+ unRegisterPriorityWait(reference.toString());
+ }
+
+ /**
+ * Unregisters a priority string to wait for.
+ *
+ * @param searchString The string to unregister from the priority list
+ */
+ public static void unRegisterPriorityWait(String searchString) {
+ synchronized (priorityWaitQueue) {
+ priorityWaitQueue.remove(searchString);
+ }
+ }
+
+ /**
+ * Returns the reference for this message. This method assumes that
+ * the message has a reference number.
+ *
+ * @param The message
+ * @return the reference number
+ */
+ private Long getReference(String[] msgParts) {
+ return Long.parseLong(msgParts[3]);
+ }
+
+ public PluginMessageConsumer(PluginStreamHandler streamHandler) {
+
+ as = new AppletSecurity();
+ this.streamHandler = streamHandler;
+ this.consumerThread.start();
+ }
+
+ private String getPriorityStrIfPriority(String message) {
+
+ synchronized (priorityWaitQueue) {
+ Iterator<String> it = priorityWaitQueue.iterator();
+
+ while (it.hasNext()) {
+ String priorityStr = it.next();
+ if (message.indexOf(priorityStr) > 0)
+ return priorityStr;
+ }
+ }
+
+ return null;
+ }
+
+ private boolean isInInit(Integer instanceNum) {
+ return initWorkers.containsKey(instanceNum);
+ }
+
+ private void addToInitWorkers(Integer instanceNum, PluginMessageHandlerWorker worker) {
+ synchronized(initWorkers) {
+ initWorkers.put(instanceNum, worker);
+ }
+ }
+
+
+ public void notifyWorkerIsFree(PluginMessageHandlerWorker worker) {
+ synchronized (initWorkers) {
+ Iterator<Integer> i = initWorkers.keySet().iterator();
+ while (i.hasNext()) {
+ Integer key = i.next();
+ if (initWorkers.get(key).equals(worker)) {
+ processedIds.add(key);
+ initWorkers.remove(key);
+ }
+ }
+ }
+
+ consumerThread.interrupt();
+ }
+
+ public void queue(String message) {
+ synchronized(readQueue) {
+ readQueue.addLast(message);
+ }
+
+ // Wake that lazy consumer thread
+ consumerThread.interrupt();
+ }
+
+ protected class ConsumerThread extends Thread {
+ public void run() {
+
+ while (true) {
+
+ String message = null;
+
+ synchronized(readQueue) {
+ message = readQueue.poll();
+ }
+
+ if (message != null) {
+
+ String[] msgParts = message.split(" ");
+
+
+ String priorityStr = getPriorityStrIfPriority(message);
+ boolean isPriorityResponse = (priorityStr != null);
+
+ //PluginDebug.debug("Message " + message + " (priority=" + isPriorityResponse + ") ready to be processed. Looking for free worker...");
+ final PluginMessageHandlerWorker worker = getFreeWorker(isPriorityResponse);
+
+ if (worker == null) {
+ synchronized(readQueue) {
+ readQueue.addLast(message);
+ }
+
+ continue; // re-loop to try next msg
+ }
+
+ if (msgParts[2].equals("tag"))
+ addToInitWorkers((new Integer(msgParts[1])), worker);
+
+ if (isPriorityResponse) {
+ unRegisterPriorityWait(priorityStr);
+ }
+
+ worker.setmessage(message);
+ worker.interrupt();
+
+ } else {
+ try {
+ Thread.sleep(1000);
+ } catch (InterruptedException ie) {}
+ }
+ }
+ }
+ }
+
+ private PluginMessageHandlerWorker getFreeWorker(boolean prioritized) {
+
+ for (PluginMessageHandlerWorker worker: workers) {
+ if (worker.isFree(prioritized)) {
+ PluginDebug.debug("Found free worker (" + worker.isPriority() + ") with id " + worker.getWorkerId());
+ // mark it busy before returning
+ worker.busy();
+ return worker;
+ }
+ }
+
+ // If we have less than MAX_WORKERS, create a new worker
+ if (workers.size() <= MAX_WORKERS) {
+ PluginMessageHandlerWorker worker = null;
+
+ if (workers.size() < (MAX_WORKERS - PRIORITY_WORKERS)) {
+ PluginDebug.debug("Cannot find free worker, creating worker " + workers.size());
+ worker = new PluginMessageHandlerWorker(this, streamHandler, workers.size(), as, false);
+ } else if (prioritized) {
+ PluginDebug.debug("Cannot find free worker, creating priority worker " + workers.size());
+ worker = new PluginMessageHandlerWorker(this, streamHandler, workers.size(), as, true);
+ } else {
+ return null;
+ }
+
+ worker.start();
+ worker.busy();
+ workers.add(worker);
+ return worker;
+
+ }
+
+ // No workers available. Better luck next time!
+ return null;
+ }
+
+ private void dumpWorkerStatus() {
+ for (PluginMessageHandlerWorker worker: workers) {
+ PluginDebug.debug(worker.toString());
+ }
+ }
+}