@Override
public synchronized Topic subscribeSharedObject(String name, boolean blocking)
throws ObjectNotExistsException, OperationForbiddenException, Exception {
// preparing locker to wait for response
try {
JCsyncAbstractOperation operation =
JCsyncAbstractOperation.get_OP_REQ_SUBSCRIBE(name, this.getNodeInfo().getName());
// inform Consistency Manager before sending request
this.dcManager.inititBuffer(name);
this.dcManager.beforeRequestSend(operation, blocking);
this.pubsubLayer.getCustomAlgorith().registerSharedObjectName(name);
this.pubsubLayer.getCustomAlgorith().networkSubscribe(name);
Short respCode = (Short) this.dcManager.afterRequestSend(operation, blocking);
if (respCode != null) {
// if the topic was created
if (respCode == JCSyncConstans.J_RESP_GENERAL_SUCCESS) {
return this.pubsubLayer.getTopic(name);
// if node can't subscribe to this topic
} else if (respCode == JCSyncConstans.J_ERR_COLLECTION_AUTH_ERROR) {
throw OperationForbiddenException.instance();
// if the topic not exists
} else if (respCode == JCSyncConstans.J_ERR_OBJECT_NOT_EXISTS) {
throw ObjectNotExistsException.instance();
} else {
log.fatal(
"received UNHANLED respCode for operation: "
+ operation.getOperationType()
+ ", objectID:"
+ operation.getObjectID());
}
} else {
log.fatal(
"received [null] respCode for operation: "
+ operation.getOperationType()
+ ", objectID:"
+ operation.getObjectID());
}
} catch (InterruptedException e) {
throw new Exception("An error on (subscribeSharedObject)");
}
log.error("(subscribeSharedObject) returns Topic = null from unknow reason!");
return null;
}
@Override
public synchronized boolean unsubscribeSharedObject(String name, boolean blocking)
throws ObjectNotExistsException, Exception {
// preparing locker to wait for response
try {
JCsyncAbstractOperation operation =
JCsyncAbstractOperation.get_OP_REQ_UNSUBSCRIBE(name, this.getNodeInfo().getName());
// inform Consistency Manager before sending request
this.dcManager.beforeRequestSend(operation, blocking);
this.pubsubLayer.getCustomAlgorith().registerSharedObjectName(name);
this.pubsubLayer.getCustomAlgorith().networkUnsubscribe(name);
Short respCode = (Short) this.dcManager.afterRequestSend(operation, blocking);
if (respCode != null) {
if (respCode == JCSyncConstans.J_RESP_GENERAL_SUCCESS) {
return true;
// if the node is not a subscriber
} else if (respCode == JCSyncConstans.J_ERR_OBJECT_NOT_EXISTS) {
throw ObjectNotExistsException.instance();
} else {
log.fatal(
"received UNHANLED respCode for operation: "
+ operation.getOperationType()
+ ", objectID:"
+ operation.getObjectID());
}
} else {
log.fatal(
"received [null] respCode for operation: "
+ operation.getOperationType()
+ ", objectID:"
+ operation.getObjectID());
}
} catch (InterruptedException e) {
throw new Exception("An error on (unsubscribeSharedObject)");
}
log.error("(unsubscribeSharedObject) returns false from unknown reason.");
return false;
}
/**
* Sends operation as a pub-sub message thought overlay. If the <tt>blocking</tt> value is
* <tt>true</tt> then working thread will be suspended until the response and indication (if
* required) will be received from the overlay, if <tt>blocking</tt> value is <tt>false</tt> then
* working thread will not be suspended and method returns <tt>null</tt>.<br>
* Typically used to sends requests.
*
* @param op operation that will be send
* @param blocking determines whenever the calling thread will be suspended until the results of
* given operation will be received.
* @return the results of given operation or <tt>null</tt> if the blocking argument value is set
* to <tt>false</tt>
* @throws Exception any error which was occurred during this operation
*/
@Override
public Object sendMessage(JCsyncAbstractOperation op, boolean blocking) throws Exception {
// if the topic for this object is unknown then throw new exception
try {
this.request_response_locker.writeLock().lock();
if (getAssignedTopic(op.getObjectID()) == null) {
throw ObjectNotExistsException.instance();
}
// try to get the consistency manager if there is already selected
AbstractConsistencyManager acm = getConsistencyManager(op.getObjectID());
if (acm == null) {
acm = this.dcManager;
}
short type = op.getOperationType();
if ((type & OP_REQ_GENERIC) == OP_REQ_GENERIC) {
acm.beforeRequestSend(op, blocking);
this.pubsubLayer.getCustomAlgorith().registerSharedObjectName(op.getObjectID());
Transaction t =
this.pubsubLayer
.getCustomAlgorith()
.nextPublishTransaction(op.getObjectID(), op.getOperationType());
op.setReqestID(t.getID());
log.trace(
"(sendMessage) - operation sent (blocking=["
+ blocking
+ "]) operation: "
+ op.toString());
this.messagesToSend.put(new MessageToSend(op, t));
this.request_response_locker.writeLock().unlock();
Object result = acm.afterRequestSend(op, blocking);
return result;
} else if ((type & OP_INDICATION_GENERIC) == OP_INDICATION_GENERIC) {
acm.beforeRequestSend(op, blocking);
this.pubsubLayer.getCustomAlgorith().registerSharedObjectName(op.getObjectID());
Transaction t =
this.pubsubLayer
.getCustomAlgorith()
.nextPublishTransaction(op.getObjectID(), op.getOperationType());
op.setReqestID(t.getID());
log.trace(
"(sendMessage) - operation sent (blocking=["
+ blocking
+ "]) operation: "
+ op.toString());
this.messagesToSend.put(new MessageToSend(op, t));
this.request_response_locker.writeLock().unlock();
Object result = acm.afterRequestSend(op, blocking);
return result;
} else {
log.error("Unhandled operation type: " + op.toString());
}
} catch (Exception e) {
throw e;
} finally {
if (this.request_response_locker.writeLock().getHoldCount() > 0
&& this.request_response_locker.writeLock().isHeldByCurrentThread()) {
this.request_response_locker.writeLock().unlock();
}
}
return null;
}
