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Socket.IO server implemented on Java
/**
* Copyright 2012 Nikita Koksharov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.corundumstudio.socketio.parser;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.ByteBufOutputStream;
import io.netty.util.CharsetUtil;
import java.io.IOException;
import java.util.List;
import java.util.Queue;
import com.corundumstudio.socketio.Configuration;
public class Encoder {
private final UTF8CharsScanner charsScanner = new UTF8CharsScanner();
private final JsonSupport jsonSupport;
private final Configuration configuration;
public Encoder(Configuration configuration, JsonSupport jsonSupport) {
this.jsonSupport = jsonSupport;
this.configuration = configuration;
}
public void encodeJsonP(String param, String msg, ByteBuf out) throws IOException {
String message = "io.j[" + param + "]("
+ jsonSupport.writeValueAsString(msg) + ");";
out.writeBytes(message.getBytes(CharsetUtil.UTF_8));
}
public ByteBuf allocateBuffer(ByteBufAllocator allocator) {
if (configuration.isPreferDirectBuffer()) {
return allocator.ioBuffer();
}
return allocator.heapBuffer();
}
public void encodePackets(Queue packets, ByteBuf buffer, ByteBufAllocator allocator) throws IOException {
if (packets.size() == 1) {
Packet packet = packets.poll();
encodePacket(packet, buffer);
} else {
int counter = 0;
while (true) {
Packet packet = packets.poll();
if (packet == null) {
break;
}
counter++;
// to prevent infinity out message
if (counter == 100) {
return;
}
ByteBuf packetBuffer = allocateBuffer(allocator);
try {
int len = encodePacketWithLength(packet, packetBuffer);
byte[] lenBytes = toChars(len);
buffer.writeBytes(Packet.DELIMITER_BYTES);
buffer.writeBytes(lenBytes);
buffer.writeBytes(Packet.DELIMITER_BYTES);
buffer.writeBytes(packetBuffer);
} finally {
packetBuffer.release();
}
}
}
}
private byte toChar(int number) {
return (byte) (number ^ 0x30);
}
final static char[] DigitTens = {'0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '1', '1', '1', '1',
'1', '1', '1', '1', '1', '1', '2', '2', '2', '2', '2', '2', '2', '2', '2', '2', '3', '3', '3',
'3', '3', '3', '3', '3', '3', '3', '4', '4', '4', '4', '4', '4', '4', '4', '4', '4', '5', '5',
'5', '5', '5', '5', '5', '5', '5', '5', '6', '6', '6', '6', '6', '6', '6', '6', '6', '6', '7',
'7', '7', '7', '7', '7', '7', '7', '7', '7', '8', '8', '8', '8', '8', '8', '8', '8', '8', '8',
'9', '9', '9', '9', '9', '9', '9', '9', '9', '9',};
final static char[] DigitOnes = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3',
'4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2',
'3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1',
'2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
'1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',};
final static char[] digits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e',
'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
'y', 'z'};
final static int[] sizeTable = {9, 99, 999, 9999, 99999, 999999, 9999999, 99999999, 999999999,
Integer.MAX_VALUE};
// Requires positive x
static int stringSize(long x) {
for (int i = 0;; i++)
if (x <= sizeTable[i])
return i + 1;
}
static void getChars(long i, int index, byte[] buf) {
long q, r;
int charPos = index;
byte sign = 0;
if (i < 0) {
sign = '-';
i = -i;
}
// Generate two digits per iteration
while (i >= 65536) {
q = i / 100;
// really: r = i - (q * 100);
r = i - ((q << 6) + (q << 5) + (q << 2));
i = q;
buf[--charPos] = (byte) DigitOnes[(int)r];
buf[--charPos] = (byte) DigitTens[(int)r];
}
// Fall thru to fast mode for smaller numbers
// assert(i <= 65536, i);
for (;;) {
q = (i * 52429) >>> (16 + 3);
r = i - ((q << 3) + (q << 1)); // r = i-(q*10) ...
buf[--charPos] = (byte) digits[(int)r];
i = q;
if (i == 0)
break;
}
if (sign != 0) {
buf[--charPos] = sign;
}
}
private byte[] toChars(long i) {
int size = (i < 0) ? stringSize(-i) + 1 : stringSize(i);
byte[] buf = new byte[size];
getChars(i, size, buf);
return buf;
}
public void encodePacket(Packet packet, ByteBuf buffer) throws IOException {
ByteBufOutputStream out = new ByteBufOutputStream(buffer);
int type = packet.getType().getValue();
buffer.writeByte(toChar(type));
buffer.writeByte(Packet.SEPARATOR);
Long id = packet.getId();
String endpoint = packet.getEndpoint();
Object ack = packet.getAck();
if (Packet.ACK_DATA.equals(ack)) {
buffer.writeBytes(toChars(id));
buffer.writeByte('+');
} else {
if (id != null) {
buffer.writeBytes(toChars(id));
}
}
buffer.writeByte(Packet.SEPARATOR);
if (endpoint != null) {
buffer.writeBytes(endpoint.getBytes(CharsetUtil.UTF_8));
}
switch (packet.getType()) {
case MESSAGE:
if (packet.getData() != null) {
buffer.writeByte(Packet.SEPARATOR);
byte[] data = packet.getData().toString().getBytes(CharsetUtil.UTF_8);
buffer.writeBytes(data);
}
break;
case EVENT:
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