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/*
* Copyright 1996-2001 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.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 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 refList = (List) incomingRefTable.get(ep);
if (refList == null) {
refList = new ArrayList();
incomingRefTable.put(ep, refList);
}
// add ref to list of refs for endpoint ep
refList.add(ref);
}
/**
* 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()) {
Set entrySet = incomingRefTable.entrySet();
Iterator iter = entrySet.iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
Endpoint ep = (Endpoint) entry.getKey();
List refList = (List) entry.getValue();
DGCClient.registerRefs(ep, refList);
}
}
}
/**
* 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
}
}
}
}
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