/**
* write_state saves the ObjectState in a file named by the type and Uid of the ObjectState. If
* the second argument is SHADOW, then the file name is different so that a subsequent
* commit_state invocation will rename the file.
*
* <p>We need to make sure that each entry is written to the next empty location in the log even
* if there's already an entry for this tx.
*/
protected boolean write_state(Uid objUid, String tName, OutputObjectState state, int ft)
throws ObjectStoreException {
if (tsLogger.logger.isTraceEnabled()) {
tsLogger.logger.trace(
"ShadowingStore.write_state("
+ objUid
+ ", "
+ tName
+ ", "
+ StateType.stateTypeString(ft)
+ ")");
}
String fname = null;
File fd = null;
if (tName != null) {
int imageSize = (int) state.length();
byte[] uidString = objUid.stringForm().getBytes();
int buffSize =
_redzone.length
+ uidString.length
+ imageSize
+ 8; // don't put in endOfLog since we keep overwriting that.
RandomAccessFile ofile = null;
java.nio.channels.FileLock lock = null;
if (imageSize > 0) {
TransactionData theLogEntry =
getLogName(objUid, tName, buffSize); // always adds entry to log
LogInstance theLog = theLogEntry.container;
if (theLog == null) throw new ObjectStoreException();
fname = genPathName(theLog.getName(), tName, ft);
fd = openAndLock(fname, FileLock.F_WRLCK, true);
if (fd == null) {
tsLogger.i18NLogger.warn_objectstore_ShadowingStore_18(fname);
return false;
}
boolean setLength = !fd.exists();
try {
ofile = new RandomAccessFile(fd, FILE_MODE);
if (setLength) {
ofile.setLength(_maxFileSize);
} else {
// may have to resize file if we keep updating this transaction info
if (theLog.remaining() < buffSize) {
long size = ofile.length() + buffSize - theLog.remaining();
ofile.setLength(size);
theLog.resize(size);
}
}
java.nio.ByteBuffer buff = java.nio.ByteBuffer.allocate(buffSize);
buff.put(_redzone);
buff.putInt(uidString.length);
buff.put(uidString);
buff.putInt(imageSize);
buff.put(state.buffer());
synchronized (_lock) {
ofile.seek(theLogEntry.offset);
ofile.write(buff.array());
}
} catch (SyncFailedException e) {
unlockAndClose(fd, ofile);
throw new ObjectStoreException(
"ShadowingStore::write_state() - write failed to sync for " + fname, e);
} catch (FileNotFoundException e) {
unlockAndClose(fd, ofile);
e.printStackTrace();
throw new ObjectStoreException(
"ShadowingStore::write_state() - write failed to locate file " + fname + ": " + e, e);
} catch (IOException e) {
unlockAndClose(fd, ofile);
e.printStackTrace();
throw new ObjectStoreException(
"ShadowingStore::write_state() - write failed for " + fname + ": " + e, e);
} finally {
try {
if (lock != null) lock.release();
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
if (!unlockAndClose(fd, ofile)) {
tsLogger.i18NLogger.warn_objectstore_ShadowingStore_19(fname);
}
super.addToCache(fname);
return true;
} else
throw new ObjectStoreException(
"ShadowStore::write_state - "
+ tsLogger.i18NLogger.get_objectstore_notypenameuid()
+ objUid);
}
private final TransactionData getLogName(Uid txid, String tName, long size)
throws ObjectStoreException {
synchronized (_logNames) {
Iterator<LogInstance> iter = _logNames.iterator();
LogInstance entry = null;
/*
* First check to see if the TxId is in an existing log. Always
* return the same log instance for the same txid so we can
* keep all data in the same location. This may mean that we have
* to extend the size of the log over time to accommodate situations
* where the log is modified but not deleted for a while, e.g., during
* recovery.
*/
while (iter.hasNext()) {
entry = (LogInstance) iter.next();
if (entry.present(txid)) {
if (size == -1) // we are reading only
return entry.getTxId(txid);
else return entry.addTxId(txid, size);
}
}
/*
* If we get here then this TxId isn't in one of the
* logs we are maintaining currently. So go back through
* the list of logs and find one that is small enough
* for us to use. The first one with room will do.
*/
iter = _logNames.iterator();
while (iter.hasNext()) {
entry = (LogInstance) iter.next();
if (!entry.isFrozen()) {
if (entry.remaining() > size) {
return entry.addTxId(txid, size);
} else {
/*
* TODO
*
* When can we remove the information about this
* log from memory? If we do it too soon then it's possible
* that delete entries will not go into the right log. If we
* leave it too late then the memory footprint increases. Prune
* the entry when we prune the log from disk?
*/
entry.freeze();
}
}
}
// if we get here, then we need to create a new log
entry = new LogInstance(tName, _maxFileSize);
_logNames.add(entry);
return entry.addTxId(txid, size);
}
}
