@SuppressWarnings("unchecked")
private final Command mergeGetCommands(
final Command currentCmd,
final Queue writeQueue,
final Queue<Command> executingCmds,
CommandType expectedCommandType) {
Map<Object, Command> mergeCommands = null;
int mergeCount = 1;
final CommandCollector commandCollector = creatCommandCollector();
currentCmd.setStatus(OperationStatus.WRITING);
commandCollector.visit(currentCmd);
while (mergeCount < mergeFactor) {
Command nextCmd = (Command) writeQueue.peek();
if (nextCmd == null) {
break;
}
if (nextCmd.isCancel()) {
writeQueue.remove();
continue;
}
if (nextCmd.getCommandType() == expectedCommandType) {
if (mergeCommands == null) { // lazy initialize
mergeCommands = new HashMap<Object, Command>(mergeFactor / 2);
mergeCommands.put(currentCmd.getKey(), currentCmd);
}
if (log.isDebugEnabled()) {
log.debug("Merge get command:" + nextCmd.toString());
}
nextCmd.setStatus(OperationStatus.WRITING);
Command removedCommand = (Command) writeQueue.remove();
// If the key is exists,add the command to associated list.
if (mergeCommands.containsKey(removedCommand.getKey())) {
final AssocCommandAware mergedGetCommand =
(AssocCommandAware) mergeCommands.get(removedCommand.getKey());
if (mergedGetCommand.getAssocCommands() == null) {
mergedGetCommand.setAssocCommands(new ArrayList<Command>(5));
}
mergedGetCommand.getAssocCommands().add(removedCommand);
} else {
commandCollector.visit(nextCmd);
mergeCommands.put(removedCommand.getKey(), removedCommand);
}
mergeCount++;
} else {
break;
}
}
commandCollector.finish();
if (mergeCount == 1) {
return currentCmd;
} else {
if (log.isDebugEnabled()) {
log.debug("Merge optimieze:merge " + mergeCount + " get commands");
}
return newMergedCommand(mergeCommands, mergeCount, commandCollector, expectedCommandType);
}
}
@SuppressWarnings("unchecked")
private final Command mergeBuffer(
final Command firstCommand,
final Queue writeQueue,
final Queue<Command> executingCmds,
final int sendBufferSize) {
Command lastCommand = firstCommand; // ��苟������涓�ommand
Command nextCmd = (Command) writeQueue.peek();
if (nextCmd == null) {
return lastCommand;
}
final List<Command> commands = getLocalList();
final ByteBuffer firstBuffer = firstCommand.getIoBuffer().buf();
int totalBytes = firstBuffer.remaining();
commands.add(firstCommand);
boolean wasFirst = true;
while (totalBytes + nextCmd.getIoBuffer().remaining() <= sendBufferSize
&& (nextCmd = (Command) writeQueue.peek()) != null) {
if (nextCmd.getStatus() == OperationStatus.WRITING) {
break;
}
if (nextCmd.isCancel()) {
writeQueue.remove();
continue;
}
nextCmd.setStatus(OperationStatus.WRITING);
writeQueue.remove();
if (wasFirst) {
wasFirst = false;
}
// if it is get_one command,try to merge get commands
if ((nextCmd.getCommandType() == CommandType.GET_ONE
|| nextCmd.getCommandType() == CommandType.GETS_ONE)
&& optimiezeGet) {
nextCmd = mergeGetCommands(nextCmd, writeQueue, executingCmds, nextCmd.getCommandType());
}
commands.add(nextCmd);
lastCommand = nextCmd;
totalBytes += nextCmd.getIoBuffer().remaining();
if (totalBytes > sendBufferSize) {
break;
}
}
if (commands.size() > 1) {
byte[] buf = new byte[totalBytes];
int offset = 0;
for (Command command : commands) {
byte[] ba = command.getIoBuffer().array();
System.arraycopy(ba, 0, buf, offset, ba.length);
offset += ba.length;
if (command != lastCommand
&& (!command.isNoreply() || command instanceof BaseBinaryCommand)) {
executingCmds.add(command);
}
}
lastCommand.setIoBuffer(IoBuffer.wrap(buf));
}
return lastCommand;
}