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package org.perl.inline.java ;
import java.util.* ;
import java.io.* ;
/*
Callback to Perl...
*/
class InlineJavaCallback {
private InlineJavaServer ijs = InlineJavaServer.GetInstance() ;
private String pkg = null ;
private InlineJavaPerlObject obj = null ;
private String method = null ;
private Object args[] = null ;
private Class cast = null ;
private Object response = null ;
private boolean response_set = false ;
InlineJavaCallback(String _pkg, String _method, Object _args[], Class _cast) {
this(null, _pkg, _method, _args, _cast) ;
}
InlineJavaCallback(InlineJavaPerlObject _obj, String _method, Object _args[], Class _cast) {
this(_obj, null, _method, _args, _cast) ;
if (obj == null){
throw new NullPointerException() ;
}
}
private InlineJavaCallback(InlineJavaPerlObject _obj, String _pkg, String _method, Object _args[], Class _cast) {
obj = _obj ;
pkg = _pkg ;
method = _method ;
args = _args ;
cast = _cast ;
if (method == null){
throw new NullPointerException() ;
}
if (cast == null){
cast = java.lang.Object.class ;
}
}
private String GetCommand(InlineJavaProtocol ijp) throws InlineJavaException {
String via = null ;
if (obj != null){
via = "" + obj.GetId() ;
}
else if (pkg != null){
via = pkg ;
}
StringBuffer cmdb = new StringBuffer("callback " + via + " " + method + " " + cast.getName()) ;
if (args != null){
for (int i = 0 ; i < args.length ; i++){
cmdb.append(" " + ijp.SerializeObject(args[i], null)) ;
}
}
return cmdb.toString() ;
}
void ClearResponse(){
response = null ;
response_set = false ;
}
Object GetResponse(){
return response ;
}
synchronized Object WaitForResponse(Thread t){
while (! response_set){
try {
InlineJavaUtils.debug(3, "waiting for callback response in " + t.getName() + "...") ;
wait() ;
}
catch (InterruptedException ie){
// Do nothing, return and wait() some more...
}
}
InlineJavaUtils.debug(3, "got callback response") ;
Object resp = response ;
response = null ;
response_set = false ;
return resp ;
}
synchronized void NotifyOfResponse(Thread t){
InlineJavaUtils.debug(3, "notifying that callback has completed in " + t.getName()) ;
notify() ;
}
synchronized void Process() throws InlineJavaException, InlineJavaPerlException {
Object ret = null ;
try {
InlineJavaProtocol ijp = new InlineJavaProtocol(ijs, null) ;
String cmd = GetCommand(ijp) ;
InlineJavaUtils.debug(2, "callback command: " + cmd) ;
Thread t = Thread.currentThread() ;
String resp = null ;
while (true) {
InlineJavaUtils.debug(3, "packet sent (callback) is " + cmd) ;
if (! ijs.IsJNI()){
// Client-server mode.
InlineJavaServerThread ijt = (InlineJavaServerThread)t ;
ijt.GetWriter().write(cmd + "\n") ;
ijt.GetWriter().flush() ;
resp = ijt.GetReader().readLine() ;
}
else{
// JNI mode
resp = ijs.jni_callback(cmd) ;
}
InlineJavaUtils.debug(3, "packet recv (callback) is " + resp) ;
StringTokenizer st = new StringTokenizer(resp, " ") ;
String c = st.nextToken() ;
if (c.equals("callback")){
boolean thrown = Boolean.parseBoolean(st.nextToken()) ;
String arg = st.nextToken() ;
InlineJavaClass ijc = new InlineJavaClass(ijs, ijp) ;
ret = ijc.CastArgument(cast, arg) ;
if (thrown){
throw new InlineJavaPerlException(ret) ;
}
break ;
}
else{
// Pass it on through the regular channel...
InlineJavaUtils.debug(3, "packet is not callback response: " + resp) ;
cmd = ijs.ProcessCommand(resp, false) ;
continue ;
}
}
}
catch (IOException e){
throw new InlineJavaException("IO error: " + e.getMessage()) ;
}
response = ret ;
response_set = true ;
}
}
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