Java Code Examples for com.alibaba.rocketmq.store.MapedFile#sliceByteBuffer()

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Example 1
Source File: TransactionStateService.java    From rocketmq with Apache License 2.0 4 votes vote down vote up 
private void recoverStateTableNormal() {

        final List<MapedFile> mapedFiles = this.tranStateTable.getMapedFiles();
        if (!mapedFiles.isEmpty()) {
            int index = mapedFiles.size() - 3;
            if (index < 0)
                index = 0;

            int mapedFileSizeLogics = this.tranStateTable.getMapedFileSize();
            MapedFile mapedFile = mapedFiles.get(index);
            ByteBuffer byteBuffer = mapedFile.sliceByteBuffer();
            /*
             * queue offset(global offset)
             */
            long processOffset = mapedFile.getFileFromOffset();
            /*
             * file offset(local offset)
             */
            long mapedFileOffset = 0;
            while (true) {
                for (int i = 0; i < mapedFileSizeLogics; i += TSStoreUnitSize) {

                    final long clOffset_read = byteBuffer.getLong();
                    final int size_read = byteBuffer.getInt();
                    final int timestamp_read = byteBuffer.getInt();
                    final int groupHashCode_read = byteBuffer.getInt();
                    /**
                     * prepared/commit/rollback
                     */
                    final int state_read = byteBuffer.getInt();

                    boolean stateOK = false;
                    switch (state_read) {
                    case MessageSysFlag.TransactionPreparedType:
                    case MessageSysFlag.TransactionCommitType:
                    case MessageSysFlag.TransactionRollbackType:
                        stateOK = true;
                        break;
                    default:
                        break;
                    }

                    if (clOffset_read >= 0 && size_read > 0 && stateOK) {
                        mapedFileOffset = i + TSStoreUnitSize;
                    }
                    else {
                        log.info("recover current transaction state table file over,  "
                                + mapedFile.getFileName() + " " + clOffset_read + " " + size_read + " "
                                + timestamp_read);
                        break;
                    }
                }

                if (mapedFileOffset == mapedFileSizeLogics) {
                    index++;
                    if (index >= mapedFiles.size()) {
                        log.info("recover last transaction state table file over, last maped file "
                                + mapedFile.getFileName());
                        break;
                    }
                    else {
                        mapedFile = mapedFiles.get(index);
                        byteBuffer = mapedFile.sliceByteBuffer();

                        processOffset = mapedFile.getFileFromOffset();
                        mapedFileOffset = 0;
                        log.info("recover next transaction state table file, " + mapedFile.getFileName());
                    }
                }
                else {
                    log.info("recover current transaction state table queue over " + mapedFile.getFileName()
                            + " " + (processOffset + mapedFileOffset));
                    break;
                }
            }

            processOffset += mapedFileOffset;

            this.tranStateTable.truncateDirtyFiles(processOffset);

            this.tranStateTableOffset.set(this.tranStateTable.getMaxOffset() / TSStoreUnitSize);
            log.info("recover normal over, transaction state table max offset: {}",
                this.tranStateTableOffset.get());
        }
    }