001 /** 002 The contents of this file are subject to the Mozilla Public License Version 1.1 003 (the "License"); you may not use this file except in compliance with the License. 004 You may obtain a copy of the License at http://www.mozilla.org/MPL/ 005 Software distributed under the License is distributed on an "AS IS" basis, 006 WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the 007 specific language governing rights and limitations under the License. 008 009 The Original Code is "Connection.java". Description: 010 "A TCP/IP connection to a remote HL7 server." 011 012 The Initial Developer of the Original Code is University Health Network. Copyright (C) 013 2002. All Rights Reserved. 014 015 Contributor(s): ______________________________________. 016 017 Alternatively, the contents of this file may be used under the terms of the 018 GNU General Public License (the ?GPL?), in which case the provisions of the GPL are 019 applicable instead of those above. If you wish to allow use of your version of this 020 file only under the terms of the GPL and not to allow others to use your version 021 of this file under the MPL, indicate your decision by deleting the provisions above 022 and replace them with the notice and other provisions required by the GPL License. 023 If you do not delete the provisions above, a recipient may use your version of 024 this file under either the MPL or the GPL. 025 */ 026 027 package ca.uhn.hl7v2.app; 028 029 import java.io.IOException; 030 import java.net.InetAddress; 031 import java.net.Socket; 032 import java.util.ArrayList; 033 import java.util.HashMap; 034 035 import ca.uhn.hl7v2.llp.HL7Writer; 036 import ca.uhn.hl7v2.llp.LLPException; 037 import ca.uhn.hl7v2.llp.LowerLayerProtocol; 038 import ca.uhn.hl7v2.parser.Parser; 039 import ca.uhn.log.HapiLog; 040 import ca.uhn.log.HapiLogFactory; 041 042 /** 043 * A TCP/IP connection to a remote HL7 server. 044 * @author Bryan Tripp 045 */ 046 public class Connection { 047 048 private static final HapiLog log = HapiLogFactory.getHapiLog(Connection.class); 049 050 private Initiator initiator; 051 private Responder responder; 052 private ArrayList sockets; 053 private HL7Writer ackWriter; 054 private HL7Writer sendWriter; 055 private Parser parser; 056 private HashMap receipts; 057 private ArrayList receivers; 058 private boolean open = true; 059 060 /** 061 * Creates a new instance of Connection, with inbound and outbound 062 * communication on a single port. 063 */ 064 public Connection(Parser parser, LowerLayerProtocol llp, Socket bidirectional) throws LLPException, IOException { 065 init(parser); 066 ackWriter = llp.getWriter(bidirectional.getOutputStream()); 067 sendWriter = ackWriter; 068 sockets.add(bidirectional); 069 Receiver r = new Receiver(this, llp.getReader(bidirectional.getInputStream())); 070 r.start(); 071 receivers.add(r); 072 this.initiator = new Initiator(this); 073 } 074 075 /** 076 * Creates a new instance of Connection, with inbound communication on one 077 * port and outbound on another. 078 */ 079 public Connection(Parser parser, LowerLayerProtocol llp, Socket inbound, Socket outbound) 080 throws LLPException, IOException { 081 init(parser); 082 ackWriter = llp.getWriter(inbound.getOutputStream()); 083 sendWriter = llp.getWriter(outbound.getOutputStream()); 084 sockets.add(outbound); //always add outbound first ... see getRemoteAddress() 085 sockets.add(inbound); 086 Receiver inRec = new Receiver(this, llp.getReader(inbound.getInputStream())); 087 Receiver outRec = new Receiver(this, llp.getReader(outbound.getInputStream())); 088 inRec.start(); 089 outRec.start(); 090 receivers.add(inRec); 091 receivers.add(outRec); 092 this.initiator = new Initiator(this); 093 } 094 095 /** Common initialization tasks */ 096 private void init(Parser parser) throws LLPException { 097 this.parser = parser; 098 sockets = new ArrayList(); 099 receipts = new HashMap(); 100 receivers = new ArrayList(); 101 responder = new Responder(parser); 102 } 103 104 /** 105 * Returns the address of the remote host to which this Connection is connected. 106 * If separate inbound and outbound sockets are used, the address of the outbound 107 * socket is returned (the addresses should normally be the same, but this isn't 108 * checked). 109 */ 110 public InetAddress getRemoteAddress() { 111 Socket s = (Socket) sockets.get(0); 112 return s.getInetAddress(); 113 } 114 115 /** Returns the Initiator associated with this connection */ 116 public Initiator getInitiator() { 117 return this.initiator; 118 } 119 120 /** Returns the Responder associated with this connection */ 121 public Responder getResponder() { 122 return this.responder; 123 } 124 125 /** Returns the HL7Writer through which unsolicited outbound messages should be sent. */ 126 protected HL7Writer getSendWriter() { 127 return this.sendWriter; 128 } 129 130 /** Returns the HL7Writer through which responses to inbound messages should be sent. */ 131 protected HL7Writer getAckWriter() { 132 return this.ackWriter; 133 } 134 135 public Parser getParser() { 136 return this.parser; 137 } 138 139 public String toString() { 140 StringBuffer buf = new StringBuffer(); 141 buf.append(getRemoteAddress().getHostName()); 142 buf.append(":"); 143 for (int i = 0; i < sockets.size(); i++) { 144 buf.append(((Socket) sockets.get(i)).getPort()); 145 if (i + 1 < sockets.size()) 146 buf.append(","); 147 } 148 return buf.toString(); 149 } 150 151 /** 152 * Reserves a future incoming message by ack ID. When the incoming message 153 * with the given ack ID arrives, the message will be available through 154 * the returned MessageReceipt. 155 */ 156 protected MessageReceipt reserveResponse(String messageID) { 157 MessageReceipt mr = new MessageReceipt(); 158 receipts.put(messageID, mr); 159 return mr; 160 } 161 162 /** 163 * Given the ack ID (MSA-2) of a message, returns the corresponding 164 * MessageReceipt if one exists (ie if reserveResponse has been called for this 165 * ack ID). Otherwise (i.e. if no object is waiting for this message), returns null. 166 * This method can only be called once per ackId (the record is dropped with the 167 * call). 168 */ 169 protected MessageReceipt findRecipient(String ackID) { 170 //String ID = getParser().getAckID(message); 171 MessageReceipt mr = null; 172 if (ackID != null) 173 mr = (MessageReceipt) receipts.remove(ackID); 174 return mr; 175 } 176 177 /** Stops running Receiver threads and closes open sockets */ 178 public void close() { 179 for (int i = 0; i < receivers.size(); i++) { 180 ((Receiver) receivers.get(i)).stop(); 181 } 182 for (int i = 0; i < sockets.size(); i++) { 183 try { 184 ((Socket) sockets.get(i)).close(); 185 } 186 catch (IOException e) { 187 log.error("Error while stopping threads and closing sockets",e); 188 } 189 } 190 open = false; 191 } 192 193 /** 194 * {@inheritDoc} 195 */ 196 public int hashCode() { 197 int hashCode = super.hashCode(); 198 return hashCode; 199 } 200 201 /** Returns false if the Connection has been closed. */ 202 public boolean isOpen() { 203 return open; 204 } 205 206 }