/**
* 新添加一条记录
*
* @return 返回记录ID
*/
public StoreTxLogPosition append(byte[] entry) throws IOException {
int length = entry.length;
if (length > storeConfig.getMaxxLogEntryLength()) {
throw new DBException("Value size can not great than " + storeConfig.getMaxxLogEntryLength());
}
// 检查当前文件容量是否足够
if (fileLength + length + ENTRY_HEAD_LENGTH > storeConfig.getTxLogFileSize()) {
throw new CapacityNotEnoughException();
}
StoreTxLogPosition result = new StoreTxLogPosition();
result.setRecordId(getNextRecordId());
boolean ok = false;
try {
entryBuffer.clear();
entryBuffer.put(magic); // 1 byte
entryBuffer.putInt(length); // 4 byte
entryBuffer.put(entry); // entry.length
entryBuffer.flip();
fileChannel.position(fileLength);
fileChannel.write(entryBuffer);
int entryLength = (ENTRY_HEAD_LENGTH + length);
fileLength += entryLength;
ok = true;
} finally {
if (ok) {
if (syncTimerTask == null || syncTimerTask.isDone()) {
syncTimerTask = new FutureTimerTask("ltsdb-dblog-sync-timertask", syncCallable);
syncTimer.schedule(syncTimerTask, storeConfig.getDbLogFlushInterval());
}
}
}
return result;
}
