[PATCH]Multiple threads performance enhancement when querying.
--------------------------------------------------------------
Key: LUCENE-568
URL: http://issues.apache.org/jira/browse/LUCENE-568
Project: Lucene - Java
Type: Improvement
Components: Search
Versions: 1.9
Environment: OS: Red Hat EL 3
Machine: Dual CPUs, 1024M Ram, 100Giga bytes SCSI disks.
Lucene 1.9.1
JVM:JDK1.5.06
Reporter: Yueyu Lin
This improvement will reduce the wait when TermInfosReader calls
ensureIndexIsRead().
The small trick like below:
....
private void ensureIndexIsRead() throws IOException {
if (indexTerms != null) // index already read
return; // do nothing
synchronized(this){
System.out.println("Read [EMAIL PROTECTED]@");
if(indexTerms != null){
System.out.println ("Someone read it.return-_-");
return ;
}
readIndex ();
}
}
private synchronized void readIndex() throws IOException{
Term[] m_indexTerms = null;
try {
int indexSize = (int)indexEnum.size; // otherwise read index
m_indexTerms = new Term[indexSize];
indexInfos = new TermInfo[indexSize];
indexPointers = new long[indexSize];
for (int i = 0; indexEnum.next(); i++) {
m_indexTerms[i] = indexEnum.term();
indexInfos[i] = indexEnum.termInfo();
indexPointers[i] = indexEnum.indexPointer;
}
} finally {
indexEnum.close();
indexEnum = null;
indexTerms = m_indexTerms;
}
}
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