- public static ReturnType acquireLock(String key, String lockId) throws MusicLockingException {
- /*
- * first check if I am on top. Since ids are not reusable there is no need to check
- * lockStatus If the status is unlocked, then the above call will automatically return
- * false.
- */
- Boolean result = false;
- try {
- result = getLockingServiceHandle().isMyTurn(lockId);
- } catch (MusicLockingException e2) {
- logger.error(EELFLoggerDelegate.errorLogger,AppMessages.INVALIDLOCK + lockId + " " + e2);
- throw new MusicLockingException();
- }
- if (!result) {
- logger.info(EELFLoggerDelegate.applicationLogger,"In acquire lock: Not your turn, someone else has the lock");
- try {
- if (!getLockingServiceHandle().lockIdExists(lockId)) {
- logger.info(EELFLoggerDelegate.applicationLogger, "In acquire lock: this lockId doesn't exist");
- return new ReturnType(ResultType.FAILURE, "Lockid doesn't exist");
- }
- } catch (MusicLockingException e) {
- logger.error(EELFLoggerDelegate.errorLogger,e.getMessage(), AppMessages.INVALIDLOCK+lockId,ErrorSeverity.CRITICAL, ErrorTypes.LOCKINGERROR);
- throw new MusicLockingException();
- }
- logger.info(EELFLoggerDelegate.applicationLogger,"In acquire lock: returning failure");
- return new ReturnType(ResultType.FAILURE, "Not your turn, someone else has the lock");
- }
-
-
- // this is for backward compatibility where locks could also be acquired on just
- // keyspaces or tables.
- if (isTableOrKeySpaceLock(key)) {
- logger.info(EELFLoggerDelegate.applicationLogger,"In acquire lock: A table or keyspace lock so no need to perform sync...so returning true");
- return new ReturnType(ResultType.SUCCESS, "A table or keyspace lock so no need to perform sync...so returning true");
- }
-
- // read the lock name corresponding to the key and if the status is locked or being locked,
- // then return false
- MusicLockState currentMls = null;
- MusicLockState newMls = null;
- try {
- currentMls = getMusicLockState(key);
- String currentLockHolder = null;
- if(currentMls != null) { currentLockHolder = currentMls.getLockHolder(); };
- if (lockId.equals(currentLockHolder)) {
- logger.info(EELFLoggerDelegate.applicationLogger,"In acquire lock: You already have the lock!");
- return new ReturnType(ResultType.SUCCESS, "You already have the lock!");
- }
- } catch (NullPointerException e) {
- logger.error(EELFLoggerDelegate.errorLogger,e.getMessage(), AppMessages.INVALIDLOCK+lockId,ErrorSeverity.CRITICAL, ErrorTypes.LOCKINGERROR);
- }
-
- // change status to "being locked". This state transition is necessary to ensure syncing
- // before granting the lock
- String lockHolder = null;
- boolean needToSyncQuorum = false;
- if (currentMls != null)
- needToSyncQuorum = currentMls.isNeedToSyncQuorum();
-
-
- newMls = new MusicLockState(MusicLockState.LockStatus.BEING_LOCKED, lockHolder,
- needToSyncQuorum);
- try {
- getLockingServiceHandle().setLockState(key, newMls);
- } catch (MusicLockingException e1) {
- logger.error(EELFLoggerDelegate.errorLogger,e1.getMessage(), AppMessages.LOCKSTATE+key,ErrorSeverity.CRITICAL, ErrorTypes.LOCKINGERROR);
- }
- logger.info(EELFLoggerDelegate.applicationLogger,"In acquire lock: Set lock state to being_locked");
-
- // do syncing if this was a forced lock release
- if (needToSyncQuorum) {
- logger.info(EELFLoggerDelegate.applicationLogger,"In acquire lock: Since there was a forcible release, need to sync quorum!");
- try {
- syncQuorum(key);
- } catch (Exception e) {
- logger.error(EELFLoggerDelegate.errorLogger,"Failed to set Lock state " + e);
- }
- }
-
- // change status to locked
- lockHolder = lockId;
- needToSyncQuorum = false;
- newMls = new MusicLockState(MusicLockState.LockStatus.LOCKED, lockHolder, needToSyncQuorum);
- try {
- getLockingServiceHandle().setLockState(key, newMls);
- } catch (MusicLockingException e) {
- logger.error(EELFLoggerDelegate.errorLogger,e.getMessage(), AppMessages.LOCKSTATE+key,ErrorSeverity.CRITICAL, ErrorTypes.LOCKINGERROR);
- }
- logger.info(EELFLoggerDelegate.applicationLogger,"In acquire lock: Set lock state to locked and assigned current lock ref "
- + lockId + " as holder");
-
- return new ReturnType(result?ResultType.SUCCESS:ResultType.FAILURE, "Set lock state to locked and assigned a lock holder");