| 22 |
22 |
|
| 23 |
23 |
import java.sql.*;
|
| 24 |
24 |
import java.util.*;
|
| 25 |
|
import java.lang.Thread;
|
| 26 |
25 |
import java.net.*;
|
| 27 |
26 |
|
| 28 |
|
public class RelationHandler implements Runnable
|
|
27 |
public class RelationHandler //implements Runnable
|
| 29 |
28 |
{
|
| 30 |
29 |
private Thread btThread = null;
|
| 31 |
30 |
private Connection conn = null;
|
| 32 |
|
private DocumentImpl xmldoc = null;
|
|
31 |
private String docid = null;
|
| 33 |
32 |
MetaCatUtil util = new MetaCatUtil();
|
| 34 |
33 |
|
| 35 |
34 |
/**
|
| 36 |
35 |
* Constructor for this class. finds all of the relations to a single xml
|
| 37 |
36 |
* document and writes them to the database. This includes transitive
|
| 38 |
37 |
* relations.
|
| 39 |
|
* @param xmldoc the xml document to index.
|
|
38 |
* @param docid the ID of the XML document to index.
|
| 40 |
39 |
*/
|
| 41 |
|
public RelationHandler(DocumentImpl xmldoc, Connection conn)
|
|
40 |
public RelationHandler(String docid, Connection conn)
|
| 42 |
41 |
{
|
| 43 |
|
//this.conn = conn;
|
| 44 |
|
try
|
| 45 |
|
{
|
| 46 |
|
conn = MetacatReplication.getDBConnection("RelationHandler." +
|
| 47 |
|
"relationHandler");
|
| 48 |
|
}
|
| 49 |
|
catch(Exception e)
|
| 50 |
|
{
|
| 51 |
|
MetaCatUtil.debugMessage("unable to get db connection in " +
|
| 52 |
|
"relationhandler: " + e.getMessage());
|
| 53 |
|
}
|
| 54 |
|
this.xmldoc = xmldoc;
|
| 55 |
|
if(xmldoc.getDoctype().equals(util.getOption("packagedoctype")))
|
| 56 |
|
{ //make sure this doctype is a package document then run the thread
|
| 57 |
|
btThread = new Thread(this);
|
| 58 |
|
btThread.setPriority(Thread.MIN_PRIORITY);
|
| 59 |
|
btThread.start();
|
| 60 |
|
}
|
|
42 |
this.conn = conn;
|
|
43 |
this.docid = docid;
|
|
44 |
putRelations();
|
| 61 |
45 |
}
|
| 62 |
46 |
|
| 63 |
47 |
/**
|
| 64 |
|
* The thread handler
|
|
48 |
* insert the relations specified in the triples into xml_relation table
|
| 65 |
49 |
*/
|
| 66 |
|
public void run()
|
| 67 |
|
{
|
|
50 |
public void putRelations() {
|
|
51 |
|
| 68 |
52 |
MetaCatUtil.debugMessage("Running relation handler!");
|
| 69 |
|
Connection dbconn = null;
|
| 70 |
|
String docid = xmldoc.getDocID();
|
| 71 |
|
String packagetype = xmldoc.getDoctype();
|
|
53 |
|
| 72 |
54 |
// deletes all of the relations with a docid of @docid.
|
| 73 |
|
deleteRelations(docid);
|
| 74 |
55 |
//pseudo-code algorithm
|
| 75 |
56 |
//for each new relation r in xml_nodes
|
| 76 |
57 |
// put r into xml_relation
|
| 77 |
58 |
// compare r to each relation already in xml_relation
|
| 78 |
59 |
// if r isrelatedto a row in xml_relation
|
| 79 |
60 |
// add a new row to xml_relation that represents this new relation
|
| 80 |
|
try
|
| 81 |
|
{
|
| 82 |
|
dbconn = MetacatReplication.getDBConnection("RelationHandler." +
|
| 83 |
|
"run");
|
|
61 |
try {
|
| 84 |
62 |
|
| 85 |
|
PreparedStatement pstmt = dbconn.prepareStatement(
|
|
63 |
DocumentImpl xmldoc = new DocumentImpl(conn);
|
|
64 |
xmldoc.getDocumentInfo(docid);
|
|
65 |
String packagetype = xmldoc.getDoctype();
|
|
66 |
|
|
67 |
// first delete the relations for this package document if any
|
|
68 |
deleteRelations(docid);
|
|
69 |
// put the new relations
|
|
70 |
PreparedStatement pstmt = conn.prepareStatement(
|
| 86 |
71 |
QuerySpecification.printPackageSQL(docid));
|
| 87 |
72 |
pstmt.execute();
|
| 88 |
73 |
|
| 89 |
74 |
//get the new relations out of xml_nodes
|
| 90 |
75 |
ResultSet rs = pstmt.getResultSet();
|
| 91 |
76 |
boolean hasmorerows = rs.next();
|
| 92 |
|
while(hasmorerows)
|
| 93 |
|
{
|
|
77 |
while(hasmorerows) {
|
| 94 |
78 |
String subject = rs.getString(1);
|
| 95 |
79 |
String relationship = rs.getString(2);
|
| 96 |
80 |
String object = rs.getString(3);
|
| ... | ... | |
| 105 |
89 |
String subDoctype = null;
|
| 106 |
90 |
String objDoctype = null;
|
| 107 |
91 |
|
| 108 |
|
try
|
| 109 |
|
{
|
|
92 |
try {
|
| 110 |
93 |
URL subMurl = new URL(subject);
|
| 111 |
|
if(subMurl.getQuery() != null)
|
| 112 |
|
{
|
|
94 |
if(subMurl.getQuery() != null) {
|
| 113 |
95 |
Hashtable subMurlParams = util.parseQuery(subMurl.getQuery());
|
| 114 |
96 |
subDocid = (String)subMurlParams.get("docid");
|
| 115 |
|
if(subMurl.getProtocol().equals("metacat"))
|
| 116 |
|
{
|
| 117 |
|
DocumentImpl subDoc = new DocumentImpl(dbconn, subDocid);
|
|
97 |
if(subMurl.getProtocol().equals("metacat")) {
|
|
98 |
DocumentImpl subDoc = new DocumentImpl(conn, subDocid);
|
| 118 |
99 |
subDoctype = subDoc.getDoctype();
|
| 119 |
100 |
}
|
| 120 |
|
}
|
| 121 |
|
else
|
| 122 |
|
{
|
|
101 |
} else {
|
| 123 |
102 |
subDocid = subject;
|
| 124 |
103 |
}
|
| 125 |
|
}
|
| 126 |
|
catch(MalformedURLException murle)
|
| 127 |
|
{ //assume this is just a docid not a url
|
|
104 |
} catch(MalformedURLException murle) {
|
|
105 |
//assume this is just a docid not a url
|
| 128 |
106 |
subDocid = subject;
|
| 129 |
107 |
}
|
| 130 |
108 |
|
| 131 |
|
try
|
| 132 |
|
{
|
|
109 |
try {
|
| 133 |
110 |
URL objMurl = new URL(object);
|
| 134 |
|
if(objMurl.getQuery() != null)
|
| 135 |
|
{
|
|
111 |
if(objMurl.getQuery() != null) {
|
| 136 |
112 |
Hashtable objMurlParams = util.parseQuery(objMurl.getQuery());
|
| 137 |
113 |
objDocid = (String)objMurlParams.get("docid");
|
| 138 |
|
if(objMurl.getProtocol().equals("metacat"))
|
| 139 |
|
{
|
| 140 |
|
DocumentImpl objDoc = new DocumentImpl(dbconn, objDocid);
|
|
114 |
if(objMurl.getProtocol().equals("metacat")) {
|
|
115 |
DocumentImpl objDoc = new DocumentImpl(conn, objDocid);
|
| 141 |
116 |
objDoctype = objDoc.getDoctype();
|
| 142 |
117 |
}
|
| 143 |
|
}
|
| 144 |
|
else
|
| 145 |
|
{
|
|
118 |
} else {
|
| 146 |
119 |
objDocid = object;
|
| 147 |
120 |
}
|
| 148 |
|
}
|
| 149 |
|
catch(MalformedURLException murle)
|
| 150 |
|
{ //assume this is just a docid
|
|
121 |
} catch(MalformedURLException murle) {
|
|
122 |
//assume this is just a docid
|
| 151 |
123 |
objDocid = object;
|
| 152 |
124 |
}
|
| 153 |
125 |
|
| ... | ... | |
| 166 |
138 |
insertStmt.append(object).append("', '");
|
| 167 |
139 |
insertStmt.append(objDoctype).append("')");
|
| 168 |
140 |
|
| 169 |
|
pstmt = dbconn.prepareStatement(insertStmt.toString());
|
|
141 |
pstmt = conn.prepareStatement(insertStmt.toString());
|
| 170 |
142 |
pstmt.execute();
|
| 171 |
143 |
|
| 172 |
144 |
hasmorerows = rs.next();
|
| 173 |
145 |
}
|
| 174 |
146 |
|
| 175 |
|
dbconn.commit();
|
| 176 |
147 |
pstmt.close();
|
| 177 |
|
dbconn.close();
|
| 178 |
|
btThread = null;
|
|
148 |
conn.commit();
|
| 179 |
149 |
|
| 180 |
|
}
|
| 181 |
|
catch(Exception e)
|
| 182 |
|
{
|
| 183 |
|
MetaCatUtil.debugMessage("Error in relationHandler.run: " +
|
|
150 |
} catch(Exception e) {
|
|
151 |
MetaCatUtil.debugMessage("Error in RelationHandler.run(): " +
|
| 184 |
152 |
e.getMessage());
|
| 185 |
|
btThread = null;
|
| 186 |
|
try
|
| 187 |
|
{
|
|
153 |
System.out.println("Error in RelationHandler.run(): " +
|
|
154 |
e.getMessage());
|
|
155 |
try {
|
| 188 |
156 |
conn.rollback();
|
| 189 |
|
}
|
| 190 |
|
catch (SQLException sqle) {}
|
|
157 |
} catch (SQLException sqle) {
|
|
158 |
System.out.println("Error in RelationHandler.run(): " +
|
|
159 |
sqle.getMessage());
|
|
160 |
}
|
| 191 |
161 |
}
|
| 192 |
162 |
}
|
| 193 |
163 |
|
| ... | ... | |
| 195 |
165 |
* Deletes all of the relations with a docid of 'docid'.
|
| 196 |
166 |
* @param docid the docid to delete.
|
| 197 |
167 |
*/
|
| 198 |
|
public void deleteRelations(String docid)
|
|
168 |
public void deleteRelations(String docid) throws SQLException
|
| 199 |
169 |
{
|
| 200 |
|
Connection dbconn = null;
|
| 201 |
|
try
|
| 202 |
|
{
|
| 203 |
|
dbconn = MetacatReplication.getDBConnection("RelationHandler."+
|
| 204 |
|
"deleteRelations");
|
| 205 |
|
}
|
| 206 |
|
catch(Exception ee)
|
| 207 |
|
{
|
| 208 |
|
MetaCatUtil.debugMessage("error in relationHandler.deleteRelations: " +
|
| 209 |
|
ee.getMessage());
|
| 210 |
|
}
|
| 211 |
|
|
| 212 |
|
try
|
| 213 |
|
{
|
| 214 |
|
PreparedStatement pstmt = dbconn.prepareStatement("delete from " +
|
|
170 |
try {
|
|
171 |
PreparedStatement pstmt = conn.prepareStatement("delete from " +
|
| 215 |
172 |
"xml_relation where docid like '" + docid + "'");
|
| 216 |
173 |
pstmt.execute();
|
| 217 |
174 |
pstmt.close();
|
| 218 |
|
dbconn.close();
|
| 219 |
|
}
|
| 220 |
|
catch(Exception e)
|
| 221 |
|
{
|
|
175 |
} catch(SQLException e) {
|
| 222 |
176 |
MetaCatUtil.debugMessage("error in RelationHandler.deleteRelations(): " +
|
| 223 |
177 |
e.getMessage());
|
| 224 |
|
try
|
| 225 |
|
{
|
| 226 |
|
dbconn.rollback();
|
| 227 |
|
dbconn.close();
|
| 228 |
|
}
|
| 229 |
|
catch (SQLException sqle) {}
|
|
178 |
System.out.println("error in RelationHandler.deleteRelations(): " +
|
|
179 |
e.getMessage());
|
|
180 |
throw e;
|
| 230 |
181 |
}
|
| 231 |
182 |
}
|
| 232 |
183 |
}
|
Simplified ReplicationHandler:
It is run now in the same thread started from DBSAXHandler;
thus the same connection opened in that thread is used,
i.e. no need for new connection and no complains as "Connection is closed" in ReplicationHandler;
"Connection is closed" error happens when in the current thread there are try to use connection opened in another thread,
i.e. DON'T USE SAME CONNECTION BETWEEN DIFFERENT THREADS.