Java; POI Optimization - Speeding up the RecordFactory class.
My last post introduced a shortToConstructorCache class. This post shows a changed
RecordFactory class that uses it. In my test case, I was able to reduce the execution time of
RecordFactory.createRecord() by 3.6 seconds and reduce the number of objects created by 466,586.
/* * ==================================================================== * Copyright 2002-2004 Apache Software Foundation * * 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. * ==================================================================== */ package org.apache.poi.hssf.record; import org.apache.poi.util.LittleEndian; import org.wwre.common.shortToShortCache; import java.io.IOException; import java.io.InputStream; import java.lang.reflect.Constructor; import java.util.*; /** * Title: Record Factory ** Description: Takes a stream and outputs an array of Record objects. *
* * @deprecated use EventRecordFactory instead * @see org.apache.poi.hssf.eventmodel.EventRecordFactory * @author Andrew C. Oliver (acoliver at apache dot org) * @author Marc Johnson (mjohnson at apache dot org) * @author Glen Stampoultzis (glens at apache.org) * @author Csaba Nagy (ncsaba at yahoo dot com) * @version 1.0-pre */ public class RecordFactory { private static int NUM_RECORDS = 10000; private static shortToConstructorCache scm = null; private static shortToShortCache ssc = new shortToShortCache(); static { Class[] records; if (FormulaRecord.EXPERIMENTAL_FORMULA_SUPPORT_ENABLED) { records = new Class[] { BOFRecord.class, InterfaceHdrRecord.class, MMSRecord.class, InterfaceEndRecord.class, WriteAccessRecord.class, CodepageRecord.class, DSFRecord.class, TabIdRecord.class, FnGroupCountRecord.class, WindowProtectRecord.class, ProtectRecord.class, PasswordRecord.class, ProtectionRev4Record.class, PasswordRev4Record.class, WindowOneRecord.class, BackupRecord.class, HideObjRecord.class, DateWindow1904Record.class, PrecisionRecord.class, RefreshAllRecord.class, BookBoolRecord.class, FontRecord.class, FormatRecord.class, ExtendedFormatRecord.class, StyleRecord.class, UseSelFSRecord.class, BoundSheetRecord.class, CountryRecord.class, SSTRecord.class, ExtSSTRecord.class, EOFRecord.class, IndexRecord.class, CalcModeRecord.class, CalcCountRecord.class, RefModeRecord.class, IterationRecord.class, DeltaRecord.class, SaveRecalcRecord.class, PrintHeadersRecord.class, PrintGridlinesRecord.class, GridsetRecord.class, GutsRecord.class, DefaultRowHeightRecord.class, WSBoolRecord.class, HeaderRecord.class, FooterRecord.class, HCenterRecord.class, VCenterRecord.class, PrintSetupRecord.class, DefaultColWidthRecord.class, DimensionsRecord.class, RowRecord.class, LabelSSTRecord.class, RKRecord.class, NumberRecord.class, DBCellRecord.class, WindowTwoRecord.class, SelectionRecord.class, ContinueRecord.class, LabelRecord.class, BlankRecord.class, ColumnInfoRecord.class, MulRKRecord.class, MulBlankRecord.class, MergeCellsRecord.class, FormulaRecord.class, BoolErrRecord.class, ExternSheetRecord.class, NameRecord.class, LeftMarginRecord.class, RightMarginRecord.class, TopMarginRecord.class, BottomMarginRecord.class, DrawingRecord.class, DrawingGroupRecord.class, DrawingSelectionRecord.class, ObjRecord.class, TextObjectRecord.class, PaletteRecord.class, StringRecord.class, RecalcIdRecord.class, SharedFormulaRecord.class, HorizontalPageBreakRecord.class, VerticalPageBreakRecord.class }; } else { records = new Class[] { BOFRecord.class, InterfaceHdrRecord.class, MMSRecord.class, InterfaceEndRecord.class, WriteAccessRecord.class, CodepageRecord.class, DSFRecord.class, TabIdRecord.class, FnGroupCountRecord.class, WindowProtectRecord.class, ProtectRecord.class, PasswordRecord.class, ProtectionRev4Record.class, PasswordRev4Record.class, WindowOneRecord.class, BackupRecord.class, HideObjRecord.class, DateWindow1904Record.class, PrecisionRecord.class, RefreshAllRecord.class, BookBoolRecord.class, FontRecord.class, FormatRecord.class, ExtendedFormatRecord.class, StyleRecord.class, UseSelFSRecord.class, BoundSheetRecord.class, CountryRecord.class, SSTRecord.class, ExtSSTRecord.class, EOFRecord.class, IndexRecord.class, CalcModeRecord.class, CalcCountRecord.class, RefModeRecord.class, IterationRecord.class, DeltaRecord.class, SaveRecalcRecord.class, PrintHeadersRecord.class, PrintGridlinesRecord.class, GridsetRecord.class, GutsRecord.class, DefaultRowHeightRecord.class, WSBoolRecord.class, HeaderRecord.class, FooterRecord.class, HCenterRecord.class, VCenterRecord.class, PrintSetupRecord.class, DefaultColWidthRecord.class, DimensionsRecord.class, RowRecord.class, LabelSSTRecord.class, RKRecord.class, NumberRecord.class, DBCellRecord.class, WindowTwoRecord.class, SelectionRecord.class, ContinueRecord.class, LabelRecord.class, BlankRecord.class, ColumnInfoRecord.class, MulRKRecord.class, MulBlankRecord.class, MergeCellsRecord.class, BoolErrRecord.class, ExternSheetRecord.class, NameRecord.class, LeftMarginRecord.class, RightMarginRecord.class, TopMarginRecord.class, BottomMarginRecord.class, PaletteRecord.class, StringRecord.class, RecalcIdRecord.class, SharedFormulaRecord.class, DrawingRecord.class, DrawingGroupRecord.class, DrawingSelectionRecord.class, ObjRecord.class, TextObjectRecord.class, HorizontalPageBreakRecord.class, VerticalPageBreakRecord.class}; } scm = new shortToConstructorCache(records); } /** * changes the default capacity (10000) to handle larger files */ public static void setCapacity(int capacity) { NUM_RECORDS = capacity; } /** * Create an array of records from an input stream * * @param in the InputStream from which the records will be obtained * * @return an array of Records created from the InputStream * * @exception RecordFormatException on error processing the InputStream */ public static List createRecords(InputStream in) throws RecordFormatException { ArrayList records = new ArrayList(NUM_RECORDS); Record last_record = null; try { short rectype = 0; do { rectype = LittleEndian.readShort(in); if (rectype != 0) { short recsize = LittleEndian.readShort(in); byte[] data = new byte[recsize]; in.read(data); Record[] recs = createRecord(rectype, recsize, data); // handle MulRK records if (recs.length > 1) { for (int k = 0; k < recs.length; k++) { records.add(recs[k]); // these will be number records last_record = recs[k]; // do to keep the algorythm homogenous...you can't } // actually continue a number record anyhow. } else { Record record = recs[0]; if (record != null) { if (rectype == ContinueRecord.sid && !(last_record instanceof ContinueRecord) && // include continuation records after !(last_record instanceof UnknownRecord)) // unknown records or previous continuation records { if (last_record == null) { throw new RecordFormatException("First record is a ContinueRecord??"); } last_record.processContinueRecord(data); } else { last_record = record; records.add(record); } } } } } while (rectype != 0); } catch (IOException e) { throw new RecordFormatException("Error reading bytes"); } // Record[] retval = new Record[ records.size() ]; // retval = ( Record [] ) records.toArray(retval); return records; } public static Record[] createRecord(short rectype, short size, byte[] data) { Record retval = null; Record[] realretval = null; try { Constructor constructor = scm.get(rectype); if (constructor != null) { retval = (Record) constructor.newInstance(new Object[] {ssc.get(rectype), ssc.get(size), data}); } else { retval = new UnknownRecord(rectype, size, data); } } catch (Exception introspectionException) { introspectionException.printStackTrace(); throw new RecordFormatException("Unable to construct record instance, the following exception occured: " + introspectionException.getMessage()); } if (retval instanceof RKRecord) { RKRecord rk = (RKRecord) retval; NumberRecord num = new NumberRecord(); num.setColumn(rk.getColumn()); num.setRow(rk.getRow()); num.setXFIndex(rk.getXFIndex()); num.setValue(rk.getRKNumber()); retval = num; } else if (retval instanceof DBCellRecord) { retval = null; } else if (retval instanceof MulRKRecord) { MulRKRecord mrk = (MulRKRecord) retval; realretval = new Record[mrk.getNumColumns()]; for (int k = 0; k < mrk.getNumColumns(); k++) { NumberRecord nr = new NumberRecord(); nr.setColumn((short) (k + mrk.getFirstColumn())); nr.setRow(mrk.getRow()); nr.setXFIndex(mrk.getXFAt(k)); nr.setValue(mrk.getRKNumberAt(k)); realretval[k] = nr; } } else if (retval instanceof MulBlankRecord) { MulBlankRecord mb = (MulBlankRecord) retval; realretval = new Record[mb.getNumColumns()]; for (int k = 0; k < mb.getNumColumns(); k++) { BlankRecord br = new BlankRecord(); br.setColumn((short) (k + mb.getFirstColumn())); br.setRow(mb.getRow()); br.setXFIndex(mb.getXFAt(k)); realretval[k] = br; } } if (realretval == null) { realretval = new Record[1]; realretval[0] = retval; } return realretval; } public static short[] getAllKnownRecordSIDs() { return scm.getTable(); } } </pre>