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lazy initialization of database tables

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This commit is contained in:
Michael Peter Christen 2012-06-08 09:30:51 +02:00
parent 701b9a28a0
commit ba10caf89a
1 changed files with 19 additions and 5 deletions
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24
source/net/yacy/kelondro/blob/Tables.java
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@ -70,8 +70,8 @@ public class Tables implements Iterable<String> {
this.keymaxlen = keymaxlen;
this.tables = new ConcurrentHashMap<String, BEncodedHeap>();
final String[] files = this.location.list();
String tablename;
File file;
// lazy initialization: do not open the database files here
for (final String f: files) {
if (f.endsWith(suffix)) {
file = new File(this.location, f);
@ -79,6 +79,22 @@ public class Tables implements Iterable<String> {
file.delete();
continue;
}
}
}
}
@Override
public Iterator<String> iterator() {
// we did a lazy initialization, but here we must discover all actually existing tables
String tablename;
File file;
final String[] files = this.location.list();
for (final String f: files) {
if (f.endsWith(suffix)) {
file = new File(this.location, f);
if (file.length() == 0) {
continue;
}
tablename = f.substring(0, f.length() - suffix.length());
try {
getHeap(tablename);
@ -86,10 +102,7 @@ public class Tables implements Iterable<String> {
}
}
}
}
@Override
public Iterator<String> iterator() {
// now the list of tables is enriched, return an iterator
return this.tables.keySet().iterator();
}
@ -376,6 +389,7 @@ public class Tables implements Iterable<String> {
this.i = heap.iterator();
}
@Override
protected Row next0() {
Row r;
while (this.i.hasNext()) {