| /* |
| * Copyright (c) 1996, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package sun.rmi.transport; |
| |
| import java.io.*; |
| import java.util.*; |
| import java.rmi.RemoteException; |
| import java.rmi.server.UID; |
| import sun.rmi.server.MarshalInputStream; |
| import sun.rmi.runtime.Log; |
| |
| /** |
| * Special stream to keep track of refs being unmarshaled so that |
| * refs can be ref-counted locally. |
| * |
| * @author Ann Wollrath |
| */ |
| class ConnectionInputStream extends MarshalInputStream { |
| |
| /** indicates whether ack is required for DGC */ |
| private boolean dgcAckNeeded = false; |
| |
| /** Hashtable mapping Endpoints to lists of LiveRefs to register */ |
| private Map<Endpoint, List<LiveRef>> incomingRefTable = new HashMap<>(5); |
| |
| /** identifier for gc ack*/ |
| private UID ackID; |
| |
| /** |
| * Constructs a marshal input stream using the underlying |
| * stream "in". |
| */ |
| ConnectionInputStream(InputStream in) throws IOException { |
| super(in); |
| } |
| |
| void readID() throws IOException { |
| ackID = UID.read((DataInput) this); |
| } |
| |
| /** |
| * Save reference in order to send "dirty" call after all args/returns |
| * have been unmarshaled. Save in hashtable incomingRefTable. This |
| * table is keyed on endpoints, and holds objects of type |
| * IncomingRefTableEntry. |
| */ |
| void saveRef(LiveRef ref) { |
| Endpoint ep = ref.getEndpoint(); |
| |
| // check whether endpoint is already in the hashtable |
| List<LiveRef> refList = incomingRefTable.get(ep); |
| |
| if (refList == null) { |
| refList = new ArrayList<LiveRef>(); |
| incomingRefTable.put(ep, refList); |
| } |
| |
| // add ref to list of refs for endpoint ep |
| refList.add(ref); |
| } |
| |
| /** |
| * Discard the saved incoming refs so there is nothing to register |
| * when {@code registerRefs} is called. |
| */ |
| void discardRefs() { |
| incomingRefTable.clear(); |
| } |
| |
| /** |
| * Add references to DGC table (and possibly send dirty call). |
| * RegisterRefs now calls DGCClient.referenced on all |
| * refs with the same endpoint at once to achieve batching of |
| * calls to the DGC |
| */ |
| void registerRefs() throws IOException { |
| if (!incomingRefTable.isEmpty()) { |
| for (Map.Entry<Endpoint, List<LiveRef>> entry : |
| incomingRefTable.entrySet()) { |
| DGCClient.registerRefs(entry.getKey(), entry.getValue()); |
| } |
| } |
| } |
| |
| /** |
| * Indicate that an ack is required to the distributed |
| * collector. |
| */ |
| void setAckNeeded() { |
| dgcAckNeeded = true; |
| } |
| |
| /** |
| * Done with input stream for remote call. Send DGC ack if necessary. |
| * Allow sending of ack to fail without flagging an error. |
| */ |
| void done(Connection c) { |
| /* |
| * WARNING: The connection c may have already been freed. It |
| * is only be safe to use c to obtain c's channel. |
| */ |
| |
| if (dgcAckNeeded) { |
| Connection conn = null; |
| Channel ch = null; |
| boolean reuse = true; |
| |
| DGCImpl.dgcLog.log(Log.VERBOSE, "send ack"); |
| |
| try { |
| ch = c.getChannel(); |
| conn = ch.newConnection(); |
| DataOutputStream out = |
| new DataOutputStream(conn.getOutputStream()); |
| out.writeByte(TransportConstants.DGCAck); |
| if (ackID == null) { |
| ackID = new UID(); |
| } |
| ackID.write((DataOutput) out); |
| conn.releaseOutputStream(); |
| |
| /* |
| * Fix for 4221173: if this connection is on top of an |
| * HttpSendSocket, the DGCAck won't actually get sent until a |
| * read operation is attempted on the socket. Calling |
| * available() is the most innocuous way of triggering the |
| * write. |
| */ |
| conn.getInputStream().available(); |
| conn.releaseInputStream(); |
| } catch (RemoteException e) { |
| reuse = false; |
| } catch (IOException e) { |
| reuse = false; |
| } |
| try { |
| if (conn != null) |
| ch.free(conn, reuse); |
| } catch (RemoteException e){ |
| // eat exception |
| } |
| } |
| } |
| } |