Initial revision

From-SVN: r102074
2005-07-16 00:30:23 +00:00
parent 6f4434b39b
commit f911ba985a
4557 changed files with 1000262 additions and 0 deletions
@@ -0,0 +1,185 @@
+/* Asynchron.java --
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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.
+
+GNU Classpath 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 GNU Classpath; 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 gnu.CORBA;
+
+import org.omg.CORBA.Request;
+import org.omg.CORBA.WrongTransaction;
+
+import java.util.Iterator;
+import java.util.LinkedList;
+
+/**
+ * Handles the asynchronous dynamic invocations.
+ *
+ * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
+ */
+public class Asynchron
+{
+  LinkedList sent = new LinkedList();
+
+  /**
+   * Send multiple prepared requests one way, do not caring about the answer.
+   * The messages, containing requests, will be marked, indicating that
+   * the sender is not expecting to get a reply.
+   *
+   * @param requests the prepared array of requests.
+   *
+   * @see Request#send_oneway()
+   */
+  public void send_multiple_requests_oneway(Request[] requests)
+  {
+    for (int i = 0; i < requests.length; i++)
+      {
+        requests [ i ].send_oneway();
+      }
+  }
+
+  /**
+   * Send multiple prepared requests expecting to get a reply. All requests
+   * are send in parallel, each in its own separate thread. When the
+   * reply arrives, it is stored in the agreed fields of the corresponing
+   * request data structure. If this method is called repeatedly,
+   * the new requests are added to the set of the currently sent requests,
+   * but the old set is not discarded.
+   *
+   * @param requests the prepared array of requests.
+   *
+   * @see #poll_next_response()
+   * @see #get_next_response()
+   * @see Request#send_deferred()
+   */
+  public void send_multiple_requests_deferred(Request[] requests)
+  {
+    synchronized (sent)
+      {
+        for (int i = 0; i < requests.length; i++)
+          {
+            sent.add(requests [ i ]);
+
+            // TODO Reuse threads that are instantiated in the method below,
+            // one thread per call.
+            requests [ i ].send_deferred();
+          }
+      }
+  }
+
+  /**
+   * Find if any of the requests that have been previously sent with
+   * {@link #send_multiple_requests_deferred}, have a response yet.
+   *
+   * @return true if there is at least one response to the previously
+   * sent request, false otherwise.
+   */
+  public boolean poll_next_response()
+  {
+    synchronized (sent)
+      {
+        Iterator iter = sent.iterator();
+        Request r;
+        while (iter.hasNext())
+          {
+            r = (Request) iter.next();
+            if (r.poll_response())
+              return true;
+          }
+      }
+    return false;
+  }
+
+  /**
+   * Get the next instance with a response being received. If all currently
+   * sent responses not yet processed, this method pauses till at least one of
+   * them is complete. If there are no requests currently sent, the method
+   * pauses till some request is submitted and the response is received.
+   * This strategy is identical to the one accepted by Suns 1.4 ORB
+   * implementation.
+   *
+   * The returned response is removed from the list of the currently
+   * submitted responses and is never returned again.
+   *
+   * @return the previously sent request that now contains the received
+   * response.
+   *
+   * @throws WrongTransaction If the method was called from the transaction
+   * scope different than the one, used to send the request. The exception
+   * can be raised only if the request is implicitly associated with some
+   * particular transaction.
+   */
+  public Request get_next_response()
+                            throws WrongTransaction
+  {
+    // The hard-coded waiting times for the incremental waiter.
+    // TODO it is possible to write more tricky system where the
+    // requests notify the Asynchron when they are complete.
+    // Wait for 5 ms intially.
+    int wait = 8;
+
+    // Double the waiting time
+    int INC = 2;
+
+    // Do not increase if the waiting time is already over 500 ms.
+    int MAX = 500;
+    while (true)
+      {
+        synchronized (sent)
+          {
+            Iterator iter = sent.iterator();
+            Request r;
+            while (iter.hasNext())
+              {
+                r = (Request) iter.next();
+                if (r.poll_response())
+                {
+                  sent.remove(r);
+                  return r;
+                }
+              }
+          }
+        try
+          {
+            Thread.sleep(wait);
+            if (wait < MAX)
+              wait = wait * INC;
+          }
+        catch (InterruptedException ex)
+          {
+          }
+      }
+  }
+}