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comparison src/org/tmatesoft/hg/internal/RevlogStream.java @ 288:b11f6a08f748

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Avoid boxing int values and list resizes on revlog read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 10 Sep 2011 00:18:39 +0200
parents 35125450c804
children 981f9f50bb6c
comparison
equal deleted inserted replaced
287:ed6b74a58c66 288:b11f6a08f748
267 267
268 private void initOutline() { 268 private void initOutline() {
269 if (baseRevisions != null && baseRevisions.length > 0) { 269 if (baseRevisions != null && baseRevisions.length > 0) {
270 return; 270 return;
271 } 271 }
272 ArrayList<Integer> resBases = new ArrayList<Integer>();
273 ArrayList<Integer> resOffsets = new ArrayList<Integer>();
274 DataAccess da = getIndexStream(); 272 DataAccess da = getIndexStream();
275 try { 273 try {
276 if (da.isEmpty()) { 274 if (da.isEmpty()) {
277 // do not fail with exception if stream is empty, it's likely intentional 275 // do not fail with exception if stream is empty, it's likely intentional
278 baseRevisions = new int[0]; 276 baseRevisions = new int[0];
280 } 278 }
281 int versionField = da.readInt(); 279 int versionField = da.readInt();
282 da.readInt(); // just to skip next 4 bytes of offset + flags 280 da.readInt(); // just to skip next 4 bytes of offset + flags
283 final int INLINEDATA = 1 << 16; 281 final int INLINEDATA = 1 << 16;
284 inline = (versionField & INLINEDATA) != 0; 282 inline = (versionField & INLINEDATA) != 0;
283 IntVector resBases, resOffsets = null;
284 int entryCountGuess = da.length() / REVLOGV1_RECORD_SIZE;
285 if (inline) {
286 entryCountGuess >>>= 2; // pure guess, assume useful data takes 3/4 of total space
287 resOffsets = new IntVector(entryCountGuess, 5000);
288 }
289 resBases = new IntVector(entryCountGuess, 5000);
290
285 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes 291 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
286 while(true) { 292 while(true) {
287 int compressedLen = da.readInt(); 293 int compressedLen = da.readInt();
288 // 8+4 = 12 bytes total read here 294 // 8+4 = 12 bytes total read here
289 @SuppressWarnings("unused") 295 @SuppressWarnings("unused")
307 } else { 313 } else {
308 da.skip(3*4 + 32); 314 da.skip(3*4 + 32);
309 } 315 }
310 if (da.isEmpty()) { 316 if (da.isEmpty()) {
311 // fine, done then 317 // fine, done then
312 baseRevisions = toArray(resBases); 318 baseRevisions = resBases.toArray(true);
313 if (inline) { 319 if (inline) {
314 indexRecordOffset = toArray(resOffsets); 320 indexRecordOffset = resOffsets.toArray(true);
315 } 321 }
316 break; 322 break;
317 } else { 323 } else {
318 // start reading next record 324 // start reading next record
319 long l = da.readLong(); 325 long l = da.readLong();