/**
* 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);
}
/**
* This is a recovery-only method and should not be called during normal execution. As such we
* need to load in all of the logs we can find that aren't already loaded (or activated).
*/
public boolean allObjUids(String tName, InputObjectState state, int match)
throws ObjectStoreException {
/*
* match will always be OS_COMMITTED since that's all we ever write for
* the logs.
*/
// in case of asynchronous removals trigger the purger now.
_purger.trigger();
/*
* Get a list of logs. Load them in to memory if we aren't already
* working on them/it. But we can prune the entry once we're
* finished or the memory footprint will grow. We should do this
* for all frozen entries eventually too.
*/
InputObjectState logs = new InputObjectState();
OutputObjectState objUids = new OutputObjectState();
/*
* We never call this method except during recovery. As such we shouldn't
* need to worry about optimizations such as checking whether or not the
* log is in current working memory.
*/
if (!super.allObjUids(tName, logs, match)) return false;
else {
/*
* Now we have all of the log names let's attach to each one
* and locate the committed instances (not deleted.)
*/
Uid logName = new Uid(Uid.nullUid());
try {
do {
logName = UidHelper.unpackFrom(logs);
if (logName.notEquals(Uid.nullUid())) {
/*
* Could check to see if log is in current working memory.
*/
/*
* TODO
*
* First purge the log if we can, but we need to know that
* we're not playing with an instance that is being manipulated
* from another VM instance.
*/
ArrayList<InputObjectState> txs = scanLog(logName, tName);
if (txs.size() > 0) {
for (int i = 0; i < txs.size(); i++) {
UidHelper.packInto(txs.get(i).stateUid(), objUids);
}
}
}
} while (logName.notEquals(Uid.nullUid()));
// remember null terminator
UidHelper.packInto(Uid.nullUid(), objUids);
state.setBuffer(objUids.buffer());
} catch (final IOException ex) {
ex.printStackTrace();
return false;
}
return true;
}
}
