/**
* The method does the following:
*
* <p>1.in case of none atomic command
*
* <p>- execute the command using the command executor
*
* <p>- notify all waiting thread about the command execution
*
* <p>2.in case of atomic command
*
* <p>- execute the command using the command executor
*
* <p>- notify all waiting thread about the command execution only
*
* <p>if the current command is the last element in the atomic command
*
* @param modelCommand
* @throws PlanckDBException
*/
@SuppressWarnings("SynchronizationOnLocalVariableOrMethodParameter")
public void doJobs(final Command modelCommand) throws PlanckDBException {
boolean consume = true;
if (modelCommand.getTransaction() == TRUE
&& modelCommand.getSessionId() == sessionMetaData.getSessionId()) {
consume = false;
}
if (consume) {
commandExecutor.consume(modelCommand);
}
if (atomicContainer.isPartOfAtomicCommand(modelCommand)) {
Command rootCommand = atomicContainer.update(modelCommand);
if (rootCommand != null) {
synchronized (rootCommand) {
rootCommand.notifyAll();
}
}
} else {
synchronized (modelCommand) {
modelCommand.notifyAll();
}
}
// log.debug("message done version : "+modelCommand.getVersion()+" id
// "+modelCommand.getEntityId());
}
/**
* This method runs in the background
*
* <p>It waits for new command to be pushed into it,
*
* <p>and then pop the commands by their version number
*
* <p>in order to execute them
*/
@SuppressWarnings("SynchronizationOnLocalVariableOrMethodParameter")
public void run() {
Command modelCommand = null;
while (active) {
try {
modelCommand = commandQueue.popCommand();
if (modelCommand != null) {
doJobs(modelCommand);
}
} catch (Exception e) {
if (active) {
log.fatal("An exception occur in the core thread : Expected lost of data ", e);
modelCommand.push(COMMAND_STATUS, INTEGER, CommandStatus.unExpectedException.getId());
synchronized (modelCommand) {
modelCommand.notify();
}
}
}
}
}
/**
* this is the heart of the storage,
*
* <p>It control all the in coming commands.
*
* <p>The method does the following
*
* <p>1. validate the command
*
* <p>2. update the version number and the conflict number (if needed)
*
* <p>3. push the command to the command queue
*
* <p>
*/
public void consume(Command command) throws PlanckDBException {
// update schema and coreManagerKey in command in case that the schema or coreManagerKey fields
// in the command are null
if (command.getSchemaId() < 0) {
command.setSchemaId(getSessionMetaData().getSchemaId());
}
if (command.getCoreManagerKey() == null) {
command.setCoreManagerKey(getCoreManager().getKey());
}
// you do not have to handle your messages which NetworkProtocolType is multicast
// because you have already handle them
final NetworkProtocolType type = command.getNetworkProtocolType();
if (type != null
&& type.isCast()
&& command.getCoreManagerKey().equals(getCoreManager().getKey())
&& sessionMetaData.getSessionId() == command.getSessionId()) {
return;
}
// TODO validate message
if (command.isModeCommand() || command.isAtomicModelCommand()) { // model change commands
// set version number or distribute
if (command.getVersion() < 0) {
distributionManager.produceTcp(command);
int version = command.getVersion();
// return if command is lock or something was wrong
if (version < 0 || command.isNotSucceed()) {
return;
}
}
if (command.isAtomicModelCommand()) {
List<Command> commands = command.getCommands();
atomicContainer.register(command, commands);
for (Command newCommand : commands) {
commandQueue.pushCommand(newCommand);
}
} else {
commandQueue.pushCommand(command);
}
} else {
Integer commandType = command.getCommandType();
if (commandType == READ_LOCK_COMMAND) {
if (!command.getCoreManagerKey().equals(coreManager.getKey())) {
List<Command> commands = command.getCommands();
boolean lock = command.isLocked();
for (Command newCommand : commands) {
int entityId = newCommand.getEntityId();
int ownerId = newCommand.getOwnerId();
if (lock) {
registry.lockEntity(entityId, true, ownerId);
} else {
registry.lockEntity(entityId, false, NON_ENTITY_OWNER);
}
}
} else {
distributionManager.produceTcp(command);
}
}
}
}