private final boolean truncateLog(final LogInstance log, boolean force)
throws ObjectStoreException {
boolean delete = false;
synchronized (_lock) {
File fd = new File(genPathName(log.getName(), log.getTypeName(), StateStatus.OS_COMMITTED));
try {
/*
* Create a list of ObjectState entries.
*/
ArrayList<InputObjectState> objectStates = scanLog(log.getName(), log.getTypeName());
/*
* At this stage we should now have a list of unique
* entries. Write them back to the log. Do this
* atomically! If the list is empty then delete the
* file!
*/
if ((objectStates != null) && (objectStates.size() > 0)) {
/*
* If we are terminating then we can truncate the log to the
* real size needed to contain the existing entries since we
* will not use it again within another VM except for
* recovery purposes.
*/
String fname = genPathName(log.getName(), log.getTypeName(), StateStatus.OS_UNCOMMITTED);
File fd2 = openAndLock(fname, FileLock.F_WRLCK, true);
RandomAccessFile oFile = new RandomAccessFile(fd2, FILE_MODE);
int size = 0;
oFile.setLength(_maxFileSize);
for (int i = 0; i < objectStates.size(); i++) {
byte[] uidString = objectStates.get(i).stateUid().stringForm().getBytes();
int buffSize =
_redzone.length + uidString.length + objectStates.get(i).buffer().length + 8;
java.nio.ByteBuffer buff = java.nio.ByteBuffer.allocate(buffSize);
size += buffSize;
try {
buff.put(_redzone);
buff.putInt(uidString.length);
buff.put(uidString);
buff.putInt(objectStates.get(i).buffer().length);
buff.put(objectStates.get(i).buffer(), 0, objectStates.get(i).buffer().length);
} catch (final Exception ex) {
ex.printStackTrace();
// TODO log
fd2.delete();
unlockAndClose(fd2, oFile);
throw new ObjectStoreException(ex.toString(), ex);
}
}
try {
if (force) {
oFile.setLength(size);
log.freeze();
}
fd2.renameTo(fd);
} catch (final Exception ex) {
ex.printStackTrace();
// TODO log
throw new ObjectStoreException(ex.toString(), ex);
} finally {
unlockAndClose(fd2, oFile);
}
} else {
/*
* Delete the log if there are no states in it. We could
* keep the file around and reuse it, but the advantage of
* this is small compared to having to cope with reusing old
* log instances.
*/
fd.delete();
/*
* Remember to remove the information from the memory cache.
*/
delete = true;
}
} catch (final ObjectStoreException ex) {
ex.printStackTrace();
throw ex;
} catch (final Exception ex) {
ex.printStackTrace();
throw new ObjectStoreException(ex.toString(), ex);
}
}
return delete;
}
/**
* 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);
}
