@Override
public ByteBuffer processCommand(RequestReader request, Protocol protocol, Cache cache) {
if (protocol == Protocol.ASCII) {
return processAsciiCommand(request.getRequest(), cache);
}
return processBinaryProtocol(request, cache);
}
@Override
public ByteBuffer processCommand(RequestReader request, Protocol protocol, Cache cache) {
String version = GemFireMemcachedServer.version;
if (protocol == Protocol.ASCII) {
return asciiCharset.encode("VERSION " + version + "\r\n");
}
ByteBuffer response = request.getResponse(HEADER_LENGTH + version.length());
response.putInt(TOTAL_BODY_LENGTH_INDEX, version.length());
response.position(HEADER_LENGTH);
response.put(asciiCharset.encode(version));
response.rewind();
request.getRequest().position(HEADER_LENGTH);
return response;
}
private ByteBuffer processBinaryCommand(RequestReader request, Cache cache) {
ByteBuffer buffer = request.getRequest();
ByteBuffer response = request.getResponse();
KeyWrapper key = getKey(buffer, HEADER_LENGTH);
Region<Object, ValueWrapper> r = getMemcachedRegion(cache);
try {
r.destroy(key);
if (isQuiet()) {
return null;
}
response.putShort(POSITION_RESPONSE_STATUS, ResponseStatus.NO_ERROR.asShort());
} catch (EntryNotFoundException e) {
response.putShort(POSITION_RESPONSE_STATUS, ResponseStatus.KEY_NOT_FOUND.asShort());
}
if (getLogger().fineEnabled()) {
getLogger().fine("delete:key:" + key);
}
return response;
}
private ByteBuffer processBinaryProtocol(RequestReader request, Cache cache) {
ByteBuffer buffer = request.getRequest();
int extrasLength = buffer.get(EXTRAS_LENGTH_INDEX);
final KeyWrapper key = getKey(buffer, HEADER_LENGTH + extrasLength);
long decrBy = buffer.getLong(HEADER_LENGTH);
long initialVal = buffer.getLong(HEADER_LENGTH + LONG_LENGTH);
int expiration = buffer.getInt(HEADER_LENGTH + LONG_LENGTH + LONG_LENGTH);
final Region<Object, ValueWrapper> r = getMemcachedRegion(cache);
ByteBuffer newVal = ByteBuffer.allocate(8);
boolean notFound = false;
ValueWrapper newValWrapper = null;
try {
while (true) {
ValueWrapper oldValWrapper = r.get(key);
if (oldValWrapper == null) {
if (expiration == -1) {
notFound = true;
} else {
newVal.putLong(0, initialVal);
newValWrapper = ValueWrapper.getWrappedValue(newVal.array(), 0 /*flags*/);
r.put(key, newValWrapper);
}
break;
}
byte[] oldVal = oldValWrapper.getValue();
long oldLong = getLongFromByteArray(oldVal);
long newLong = oldLong - decrBy;
if (newLong < 0) {
newLong = 0;
}
newVal.putLong(0, newLong);
newValWrapper = ValueWrapper.getWrappedValue(newVal.array(), 0 /*flags*/);
if (r.replace(key, oldValWrapper, newValWrapper)) {
break;
}
}
} catch (Exception e) {
return handleBinaryException(key, request, request.getResponse(), "decrement", e);
}
if (expiration > 0) {
StorageCommand.getExpiryExecutor()
.schedule(
new Runnable() {
@Override
public void run() {
r.destroy(key);
}
},
expiration,
TimeUnit.SECONDS);
}
if (getLogger().fineEnabled()) {
getLogger()
.fine(
"decr:key:"
+ key
+ " decrBy:"
+ decrBy
+ " initVal:"
+ initialVal
+ " exp:"
+ expiration
+ " notFound:"
+ notFound);
}
ByteBuffer response = null;
if (notFound) {
response = request.getResponse();
response.putShort(POSITION_RESPONSE_STATUS, ResponseStatus.KEY_NOT_FOUND.asShort());
} else {
if (isQuiet()) {
return null;
}
response = request.getResponse(HEADER_LENGTH + LONG_LENGTH);
response.putInt(TOTAL_BODY_LENGTH_INDEX, LONG_LENGTH);
response.putLong(HEADER_LENGTH, newVal.getLong(0));
response.putLong(POSITION_CAS, newValWrapper.getVersion());
}
return response;
}