/*
* @(#)$Id$
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.xquery.dm.dtm.hooked;
import java.io.File;
import xbird.storage.DbCollection;
import xbird.util.csv.CsvWriter;
import xbird.util.resource.PropertyMap;
import xbird.xquery.dm.dtm.DocumentTable.PersistentDocumentTable;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public final class ProfiledPersistentDocumentTable extends PersistentDocumentTable
implements IProfiledDocumentTable {
private static final long serialVersionUID = -1068490396439849405L;
private static final int PAGE_SHIFT = 9;
private final CsvWriter _csv;
private boolean enable = true;
private int prevPage = -1;
public ProfiledPersistentDocumentTable(String file, DbCollection coll, String docName, PropertyMap docProps) {
super(coll, docName, docProps);
File f = new File(file);
System.err.println("Access pattern to the XMLDocumentTable is profiled to "
+ f.getAbsolutePath());
final CsvWriter csv = new CsvWriter(f);
csv.writeRow("page");
this._csv = csv;
}
public void setProfiling(boolean enable) {
this.enable = enable;
}
@Override
public long dataAt(long at) {
if(enable) {
long lp = at >> PAGE_SHIFT;
if(lp > 0x7fffffffL) {
throw new IllegalStateException("Illegal page number: " + lp);
}
int page = (int) lp;
if(prevPage != page) {
_csv.writeRow(Integer.toString(page));
}
this.prevPage = page;
}
return super.dataAt(at);
}
}