public void executeCall() throws Exception {
byte returncode;
ObjectInput oin;
// signal the call when constructing
try {
DataOutputStream dout = conn.getDataOutputStream();
dout.write(MESSAGE_CALL);
oout = conn.startObjectOutputStream(); // (re)start ObjectOutputStream
objid.write(oout);
oout.writeInt(opnum);
oout.writeLong(hash);
} catch (IOException ex) {
throw new MarshalException("Try to write header but failed.", ex);
}
try {
releaseOutputStream();
DataInputStream din = conn.getDataInputStream();
if (din.readByte() != MESSAGE_CALL_ACK) throw new RemoteException("Call not acked");
oin = startInputStream();
returncode = oin.readByte();
UID.read(oin);
} catch (IOException ex) {
throw new UnmarshalException("Try to read header but failed:", ex);
}
// check return code
switch (returncode) {
case RETURN_ACK: // it's ok
return;
case RETURN_NACK:
Object returnobj;
try {
returnobj = oin.readObject();
} catch (Exception ex2) {
throw new UnmarshalException("Try to read exception object but failed", ex2);
}
if (!(returnobj instanceof Exception))
throw new UnmarshalException("Should be Exception type here: " + returnobj);
throw (Exception) returnobj;
default:
throw new UnmarshalException("Invalid return code");
}
}
public void write(ObjectOutput out, boolean useNewFormat) throws IOException {
boolean isResultStream = false;
if (out instanceof ConnectionOutputStream) {
ConnectionOutputStream stream = (ConnectionOutputStream) out;
isResultStream = stream.isResultStream();
/*
* Ensure that referential integrity is not broken while
* this LiveRef is in transit. If it is being marshalled
* as part of a result, it may not otherwise be strongly
* reachable after the remote call has completed; even if
* it is being marshalled as part of an argument, the VM
* may determine that the reference on the stack is no
* longer reachable after marshalling (see 6181943)--
* therefore, tell the stream to save a reference until a
* timeout expires or, for results, a DGCAck message has
* been received from the caller, or for arguments, the
* remote call has completed. For a "local" LiveRef, save
* a reference to the impl directly, because the impl is
* not reachable from the LiveRef (see 4114579);
* otherwise, save a reference to the LiveRef, for the
* client-side DGC to watch over. (Also see 4017232.)
*/
if (isLocal) {
ObjectEndpoint oe = new ObjectEndpoint(id, ep.getInboundTransport());
Target target = ObjectTable.getTarget(oe);
if (target != null) {
Remote impl = target.getImpl();
if (impl != null) {
stream.saveObject(impl);
}
}
} else {
stream.saveObject(this);
}
}
// All together now write out the endpoint, id, and flag
// (need to choose whether or not to use old JDK1.1 endpoint format)
if (useNewFormat) {
((TCPEndpoint) ep).write(out);
} else {
((TCPEndpoint) ep).writeHostPortFormat(out);
}
id.write(out);
out.writeBoolean(isResultStream);
}
public void write(ObjectOutput out, boolean useNewFormat) throws IOException {
boolean isResultStream = false;
if (out instanceof ConnectionOutputStream) {
ConnectionOutputStream stream = (ConnectionOutputStream) out;
isResultStream = stream.isResultStream();
/*
* If this LiveRef is being marshalled as part of a return value,
* then we have to worry about referential integrity being broken
* while the reference is in transit, in case there no longer
* remains a strong reference in this VM after the call has
* completed. Therefore, we tell the stream to save a reference
* until an acknowledgment has been received from the caller; for
* "local" LiveRefs, save a reference to the impl directly,
* because the impl is not reachable from this LiveRef (see
* 4114579); otherwise, save a reference to the LiveRef, for the
* client-side DGC to watch over (see 4017232 for more details).
*/
if (isResultStream) {
if (isLocal) {
Target target = ObjectTable.getTarget(id);
if (target != null) {
Remote impl = target.getImpl();
if (impl != null) {
stream.saveObject(impl);
}
}
} else {
stream.saveObject(this);
}
}
}
// All together now write out the endpoint, id, and flag
// (need to choose whether or not to use old JDK1.1 endpoint format)
if (useNewFormat) {
((TCPEndpoint) ep).write(out);
} else {
((TCPEndpoint) ep).writeHostPortFormat(out);
}
id.write(out);
out.writeBoolean(isResultStream);
}