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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.tuscany.sca.binding.erlang.impl;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.tuscany.sca.binding.erlang.ErlangBinding;
import org.apache.tuscany.sca.binding.erlang.impl.exceptions.ErlangException;
import org.apache.tuscany.sca.binding.erlang.impl.types.TypeHelpersProxy;
import org.apache.tuscany.sca.interfacedef.java.JavaOperation;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import com.ericsson.otp.erlang.OtpAuthException;
import com.ericsson.otp.erlang.OtpConnection;
import com.ericsson.otp.erlang.OtpEpmd;
import com.ericsson.otp.erlang.OtpErlangList;
import com.ericsson.otp.erlang.OtpErlangObject;
import com.ericsson.otp.erlang.OtpErlangTuple;
import com.ericsson.otp.erlang.OtpMbox;
import com.ericsson.otp.erlang.OtpMsg;
import com.ericsson.otp.erlang.OtpNode;
import com.ericsson.otp.erlang.OtpPeer;
import com.ericsson.otp.erlang.OtpSelf;
/**
* @version $Rev$ $Date$
*/
public class ErlangInvoker implements Invoker {
private static final Logger logger = Logger.getLogger(ErlangInvoker.class
.getName());
private ErlangBinding binding;
public ErlangInvoker(ErlangBinding binding) {
this.binding = binding;
}
private void reportProblem(Message msg, Exception e) {
if (msg.getOperation().getFaultTypes().size() > 0) {
msg.setFaultBody(e);
} else {
// NOTE: don't throw exception if not declared
// TODO: externalize message?
msg.setBody(null);
logger
.log(Level.WARNING, "Problem while sending/receiving data",
e);
}
}
private String getClientNodeName() {
return "_connector_to_" + binding.getNode()
+ System.currentTimeMillis();
}
private Message sendMessage(Message msg) {
OtpMbox tmpMbox = null;
OtpNode node = null;
try {
node = new OtpNode(getClientNodeName());
if (binding.hasCookie()) {
node.setCookie(binding.getCookie());
}
tmpMbox = node.createMbox();
// obtain args, make sure they aren't null
// NOTE: sending message with no content (but only with senders PID)
// is possible
Object[] args = (Object[]) (msg.getBody() != null ? msg.getBody()
: new Object[0]);
Method jmethod = ((JavaOperation) msg.getOperation())
.getJavaMethod();
// create and send msg with self pid in the beginning
OtpErlangObject[] argsArray = {
tmpMbox.self(),
TypeHelpersProxy.toErlang(args, jmethod
.getParameterAnnotations()) };
OtpErlangObject otpArgs = new OtpErlangTuple(argsArray);
tmpMbox.send(msg.getOperation().getName(), binding.getNode(),
otpArgs);
if (msg.getOperation().getOutputType() != null) {
OtpMsg resultMsg = null;
if (binding.hasTimeout()) {
resultMsg = tmpMbox.receiveMsg(binding.getTimeout());
} else {
resultMsg = tmpMbox.receiveMsg();
}
OtpErlangObject result = resultMsg.getMsg();
msg.setBody(TypeHelpersProxy.toJava(result, msg.getOperation()
.getOutputType().getPhysical(), jmethod
.getAnnotations()));
}
} catch (InterruptedException e) {
// TODO: externalize message?
ErlangException ee = new ErlangException(
"Timeout while receiving message reply", e);
msg.setBody(null);
reportProblem(msg, ee);
} catch (Exception e) {
reportProblem(msg, e);
} finally {
if (tmpMbox != null) {
tmpMbox.close();
}
if (node != null) {
OtpEpmd.unPublishPort(node);
node.close();
}
}
return msg;
}
private Message invokeOperation(Message msg) {
OtpSelf self = null;
OtpPeer other = null;
OtpConnection connection = null;
try {
self = new OtpSelf(getClientNodeName());
if (binding.hasCookie()) {
self.setCookie(binding.getCookie());
}
other = new OtpPeer(binding.getNode());
connection = self.connect(other);
Method jmethod = ((JavaOperation) msg.getOperation())
.getJavaMethod();
OtpErlangList params = TypeHelpersProxy.toErlangAsList(msg
.getBody(), jmethod.getParameterAnnotations());
OtpErlangTuple message = MessageHelper.rpcMessage(self.pid(), self
.createRef(), binding.getModule(), msg.getOperation()
.getName(), params);
connection.send(MessageHelper.RPC_MBOX, message);
OtpErlangObject rpcResponse = null;
if (binding.hasTimeout()) {
rpcResponse = connection.receive(binding.getTimeout());
} else {
rpcResponse = connection.receive();
}
OtpErlangObject result = ((OtpErlangTuple) rpcResponse)
.elementAt(1);
if (MessageHelper.isfunctionUndefMessage(result)) {
// TODO: externalize message?
Exception e = new ErlangException("No '" + binding.getModule()
+ ":" + msg.getOperation().getName()
+ "' operation defined on remote '" + binding.getNode()
+ "' node.");
reportProblem(msg, e);
msg.setBody(null);
} else if (msg.getOperation().getOutputType() != null) {
jmethod.getAnnotations();
msg.setBody(TypeHelpersProxy.toJava(result, msg.getOperation()
.getOutputType().getPhysical(), jmethod
.getAnnotations()));
}
} catch (OtpAuthException e) {
// TODO: externalize message?
ErlangException ee = new ErlangException(
"Problem while authenticating client - check your cookie",
e);
msg.setBody(null);
reportProblem(msg, ee);
} catch (InterruptedException e) {
// TODO: externalize message?
ErlangException ee = new ErlangException(
"Timeout while receiving RPC reply", e);
msg.setBody(null);
reportProblem(msg, ee);
} catch (Exception e) {
reportProblem(msg, e);
} finally {
if (connection != null) {
connection.close();
}
}
return msg;
}
/**
* @see org.apache.tuscany.sca.invocation.Invoker#invoke(org.apache.tuscany.sca.invocation.Message)
*/
public Message invoke(Message msg) {
if (binding.isMbox()) {
return sendMessage(msg);
} else {
return invokeOperation(msg);
}
}
}
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