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/*
* Copyright (c) 2009-2021 jMonkeyEngine
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*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
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* documentation and/or other materials provided with the distribution.
*
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* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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package com.jme3.network.rmi;
import com.jme3.network.serializing.Serializer;
import com.jme3.network.serializing.SerializerRegistration;
import java.io.IOException;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* {@link RmiSerializer} is responsible for serializing RMI messages
* like define object, call, and return.
*
* @author Kirill Vainer
*/
public class RmiSerializer extends Serializer {
private static final Logger logger = Logger.getLogger(RmiSerializer.class.getName());
// not good for multithreaded applications
private char[] chrBuf = new char[256];
private void writeString(ByteBuffer buffer, String string) throws IOException{
int length = string.length();
if (length > 255){
logger.log(Level.WARNING, "The string length exceeds the limit! {0} > 255", length);
buffer.put( (byte) 0 );
return;
}
buffer.put( (byte) length );
for (int i = 0; i < length; i++){
buffer.put( (byte) string.charAt(i) );
}
}
private String readString(ByteBuffer buffer){
int length = buffer.get() & 0xff;
for (int i = 0; i < length; i++){
chrBuf[i] = (char) (buffer.get() & 0xff);
}
return String.valueOf(chrBuf, 0, length);
}
private void writeType(ByteBuffer buffer, Class clazz) throws IOException{
if (clazz == void.class){
buffer.putShort((short)0);
} else {
SerializerRegistration reg = Serializer.getSerializerRegistration(clazz);
if (reg == null){
logger.log(Level.WARNING, "Unknown class: {0}", clazz);
throw new IOException(); // prevents message from being serialized
}
buffer.putShort(reg.getId());
}
}
private Class readType(ByteBuffer buffer) throws IOException{
SerializerRegistration reg = Serializer.readClass(buffer);
if (reg == null){
// either "void" or unknown val
short id = buffer.getShort(buffer.position()-2);
if (id == 0){
return void.class;
} else{
logger.log(Level.WARNING, "Undefined class ID: {0}", id);
throw new IOException(); // prevents message from being serialized
}
}
return reg.getType();
}
private void writeMethod(ByteBuffer buffer, Method method) throws IOException{
String name = method.getName();
Class[] paramTypes = method.getParameterTypes();
Class returnType = method.getReturnType();
writeString(buffer, name);
writeType(buffer, returnType);
buffer.put((byte)paramTypes.length);
for (Class paramType : paramTypes)
writeType(buffer, paramType);
}
private MethodDef readMethod(ByteBuffer buffer) throws IOException{
String name = readString(buffer);
Class retType = readType(buffer);
int numParams = buffer.get() & 0xff;
Class[] paramTypes = new Class[numParams];
for (int i = 0; i < numParams; i++){
paramTypes[i] = readType(buffer);
}
MethodDef def = new MethodDef();
def.name = name;
def.paramTypes = paramTypes;
def.retType = retType;
return def;
}
private void writeObjectDef(ByteBuffer buffer, ObjectDef def) throws IOException{
buffer.putShort((short)def.objectId);
writeString(buffer, def.objectName);
Method[] methods = def.methods;
buffer.put( (byte) methods.length );
for (Method method : methods){
writeMethod(buffer, method);
}
}
private ObjectDef readObjectDef(ByteBuffer buffer) throws IOException{
ObjectDef def = new ObjectDef();
def.objectId = buffer.getShort();
def.objectName = readString(buffer);
int numMethods = buffer.get() & 0xff;
MethodDef[] methodDefs = new MethodDef[numMethods];
for (int i = 0; i < numMethods; i++){
methodDefs[i] = readMethod(buffer);
}
def.methodDefs = methodDefs;
return def;
}
private void writeObjectDefs(ByteBuffer buffer, RemoteObjectDefMessage defMsg) throws IOException{
ObjectDef[] defs = defMsg.objects;
buffer.put( (byte) defs.length );
for (ObjectDef def : defs)
writeObjectDef(buffer, def);
}
private RemoteObjectDefMessage readObjectDefs(ByteBuffer buffer) throws IOException{
RemoteObjectDefMessage defMsg = new RemoteObjectDefMessage();
int numObjs = buffer.get() & 0xff;
ObjectDef[] defs = new ObjectDef[numObjs];
for (int i = 0; i < numObjs; i++){
defs[i] = readObjectDef(buffer);
}
defMsg.objects = defs;
return defMsg;
}
private void writeMethodCall(ByteBuffer buffer, RemoteMethodCallMessage call) throws IOException{
buffer.putShort((short)call.objectId);
buffer.putShort(call.methodId);
buffer.putShort(call.invocationId);
if (call.args == null){
buffer.put((byte)0);
}else{
buffer.put((byte)call.args.length);
// Right now it writes 0 for every null argument
// and 1 for every non-null argument followed by the serialized
// argument. For the future, using a bit set should be considered.
for (Object obj : call.args){
if (obj != null){
buffer.put((byte)0x01);
Serializer.writeClassAndObject(buffer, obj);
}else{
buffer.put((byte)0x00);
}
}
}
}
private RemoteMethodCallMessage readMethodCall(ByteBuffer buffer) throws IOException{
RemoteMethodCallMessage call = new RemoteMethodCallMessage();
call.objectId = buffer.getShort();
call.methodId = buffer.getShort();
call.invocationId = buffer.getShort();
int numArgs = buffer.get() & 0xff;
if (numArgs > 0){
Object[] args = new Object[numArgs];
for (int i = 0; i < numArgs; i++){
if (buffer.get() == (byte)0x01){
args[i] = Serializer.readClassAndObject(buffer);
}
}
call.args = args;
}
return call;
}
private void writeMethodReturn(ByteBuffer buffer, RemoteMethodReturnMessage ret) throws IOException{
buffer.putShort(ret.invocationID);
if (ret.retVal != null){
buffer.put((byte)0x01);
Serializer.writeClassAndObject(buffer, ret.retVal);
}else{
buffer.put((byte)0x00);
}
}
private RemoteMethodReturnMessage readMethodReturn(ByteBuffer buffer) throws IOException{
RemoteMethodReturnMessage ret = new RemoteMethodReturnMessage();
ret.invocationID = buffer.getShort();
if (buffer.get() == (byte)0x01){
ret.retVal = Serializer.readClassAndObject(buffer);
}
return ret;
}
@Override
@SuppressWarnings("unchecked")
public T readObject(ByteBuffer data, Class c) throws IOException {
if (c == RemoteObjectDefMessage.class){
return (T) readObjectDefs(data);
}else if (c == RemoteMethodCallMessage.class){
return (T) readMethodCall(data);
}else if (c == RemoteMethodReturnMessage.class){
return (T) readMethodReturn(data);
}
return null;
}
@Override
public void writeObject(ByteBuffer buffer, Object object) throws IOException {
// int p = buffer.position();
if (object instanceof RemoteObjectDefMessage){
RemoteObjectDefMessage def = (RemoteObjectDefMessage) object;
writeObjectDefs(buffer, def);
}else if (object instanceof RemoteMethodCallMessage){
RemoteMethodCallMessage call = (RemoteMethodCallMessage) object;
writeMethodCall(buffer, call);
}else if (object instanceof RemoteMethodReturnMessage){
RemoteMethodReturnMessage ret = (RemoteMethodReturnMessage) object;
writeMethodReturn(buffer, ret);
}
// p = buffer.position() - p;
// System.out.println(object+": uses " + p + " bytes");
}
}
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