Showing the changes to java/pkg/sun/rmi/transport/ConnectionInputStream.java (1 of 18352 files). Show all
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| 1 | +/* | |
| 2 | + * Copyright (c) 1996, 2001, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | +package sun.rmi.transport; | |
| 26 | + | |
| 27 | +import java.io.*; | |
| 28 | +import java.util.*; | |
| 29 | +import java.rmi.RemoteException; | |
| 30 | +import java.rmi.server.UID; | |
| 31 | +import sun.rmi.server.MarshalInputStream; | |
| 32 | +import sun.rmi.runtime.Log; | |
| 33 | + | |
| 34 | +/** | |
| 35 | + * Special stream to keep track of refs being unmarshaled so that | |
| 36 | + * refs can be ref-counted locally. | |
| 37 | + * | |
| 38 | + * @author Ann Wollrath | |
| 39 | + */ | |
| 40 | +class ConnectionInputStream extends MarshalInputStream { | |
| 41 | + | |
| 42 | + /** indicates whether ack is required for DGC */ | |
| 43 | + private boolean dgcAckNeeded = false; | |
| 44 | + | |
| 45 | + /** Hashtable mapping Endpoints to lists of LiveRefs to register */ | |
| 46 | + private Map incomingRefTable = new HashMap(5); | |
| 47 | + | |
| 48 | + /** identifier for gc ack*/ | |
| 49 | + private UID ackID; | |
| 50 | + | |
| 51 | + /** | |
| 52 | + * Constructs a marshal input stream using the underlying | |
| 53 | + * stream "in". | |
| 54 | + */ | |
| 55 | + ConnectionInputStream(InputStream in) throws IOException { | |
| 56 | + super(in); | |
| 57 | + } | |
| 58 | + | |
| 59 | + void readID() throws IOException { | |
| 60 | + ackID = UID.read((DataInput) this); | |
| 61 | + } | |
| 62 | + | |
| 63 | + /** | |
| 64 | + * Save reference in order to send "dirty" call after all args/returns | |
| 65 | + * have been unmarshaled. Save in hashtable incomingRefTable. This | |
| 66 | + * table is keyed on endpoints, and holds objects of type | |
| 67 | + * IncomingRefTableEntry. | |
| 68 | + */ | |
| 69 | + void saveRef(LiveRef ref) { | |
| 70 | + Endpoint ep = ref.getEndpoint(); | |
| 71 | + | |
| 72 | + // check whether endpoint is already in the hashtable | |
| 73 | + List refList = (List) incomingRefTable.get(ep); | |
| 74 | + | |
| 75 | + if (refList == null) { | |
| 76 | + refList = new ArrayList(); | |
| 77 | + incomingRefTable.put(ep, refList); | |
| 78 | + } | |
| 79 | + | |
| 80 | + // add ref to list of refs for endpoint ep | |
| 81 | + refList.add(ref); | |
| 82 | + } | |
| 83 | + | |
| 84 | + /** | |
| 85 | + * Add references to DGC table (and possibly send dirty call). | |
| 86 | + * RegisterRefs now calls DGCClient.referenced on all | |
| 87 | + * refs with the same endpoint at once to achieve batching of | |
| 88 | + * calls to the DGC | |
| 89 | + */ | |
| 90 | + void registerRefs() throws IOException { | |
| 91 | + if (!incomingRefTable.isEmpty()) { | |
| 92 | + Set entrySet = incomingRefTable.entrySet(); | |
| 93 | + Iterator iter = entrySet.iterator(); | |
| 94 | + while (iter.hasNext()) { | |
| 95 | + Map.Entry entry = (Map.Entry) iter.next(); | |
| 96 | + Endpoint ep = (Endpoint) entry.getKey(); | |
| 97 | + List refList = (List) entry.getValue(); | |
| 98 | + DGCClient.registerRefs(ep, refList); | |
| 99 | + } | |
| 100 | + } | |
| 101 | + } | |
| 102 | + | |
| 103 | + /** | |
| 104 | + * Indicate that an ack is required to the distributed | |
| 105 | + * collector. | |
| 106 | + */ | |
| 107 | + void setAckNeeded() { | |
| 108 | + dgcAckNeeded = true; | |
| 109 | + } | |
| 110 | + | |
| 111 | + /** | |
| 112 | + * Done with input stream for remote call. Send DGC ack if necessary. | |
| 113 | + * Allow sending of ack to fail without flagging an error. | |
| 114 | + */ | |
| 115 | + void done(Connection c) { | |
| 116 | + /* | |
| 117 | + * WARNING: The connection c may have already been freed. It | |
| 118 | + * is only be safe to use c to obtain c's channel. | |
| 119 | + */ | |
| 120 | + | |
| 121 | + if (dgcAckNeeded) { | |
| 122 | + Connection conn = null; | |
| 123 | + Channel ch = null; | |
| 124 | + boolean reuse = true; | |
| 125 | + | |
| 126 | + DGCImpl.dgcLog.log(Log.VERBOSE, "send ack"); | |
| 127 | + | |
| 128 | + try { | |
| 129 | + ch = c.getChannel(); | |
| 130 | + conn = ch.newConnection(); | |
| 131 | + DataOutputStream out = | |
| 132 | + new DataOutputStream(conn.getOutputStream()); | |
| 133 | + out.writeByte(TransportConstants.DGCAck); | |
| 134 | + if (ackID == null) { | |
| 135 | + ackID = new UID(); | |
| 136 | + } | |
| 137 | + ackID.write((DataOutput) out); | |
| 138 | + conn.releaseOutputStream(); | |
| 139 | + | |
| 140 | + /* | |
| 141 | + * Fix for 4221173: if this connection is on top of an | |
| 142 | + * HttpSendSocket, the DGCAck won't actually get sent until a | |
| 143 | + * read operation is attempted on the socket. Calling | |
| 144 | + * available() is the most innocuous way of triggering the | |
| 145 | + * write. | |
| 146 | + */ | |
| 147 | + conn.getInputStream().available(); | |
| 148 | + conn.releaseInputStream(); | |
| 149 | + } catch (RemoteException e) { | |
| 150 | + reuse = false; | |
| 151 | + } catch (IOException e) { | |
| 152 | + reuse = false; | |
| 153 | + } | |
| 154 | + try { | |
| 155 | + if (conn != null) | |
| 156 | + ch.free(conn, reuse); | |
| 157 | + } catch (RemoteException e){ | |
| 158 | + // eat exception | |
| 159 | + } | |
| 160 | + } | |
| 161 | + } | |
| 162 | +} | |