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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.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Map;
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.types.TypeHelpersProxy;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.java.JavaOperation;
import org.apache.tuscany.sca.runtime.RuntimeComponentService;
import com.ericsson.otp.erlang.OtpAuthException;
import com.ericsson.otp.erlang.OtpConnection;
import com.ericsson.otp.erlang.OtpErlangAtom;
import com.ericsson.otp.erlang.OtpErlangDecodeException;
import com.ericsson.otp.erlang.OtpErlangExit;
import com.ericsson.otp.erlang.OtpErlangList;
import com.ericsson.otp.erlang.OtpErlangObject;
import com.ericsson.otp.erlang.OtpErlangPid;
import com.ericsson.otp.erlang.OtpErlangRef;
import com.ericsson.otp.erlang.OtpErlangString;
import com.ericsson.otp.erlang.OtpErlangTuple;
import com.ericsson.otp.erlang.OtpMsg;
/**
* @version $Rev$ $Date$
*/
public class ServiceExecutor implements Runnable {
private static final Logger logger = Logger.getLogger(ServiceExecutor.class
.getName());
private ErlangNodeElement nodeElement;
private OtpConnection connection;
private Map<String, List<Operation>> groupedOperations;
private String name;
public ServiceExecutor(OtpConnection connection,
Map<String, List<Operation>> groupedOperations,
ErlangNodeElement nodeElement, String name) {
this.connection = connection;
this.groupedOperations = groupedOperations;
this.nodeElement = nodeElement;
this.name = name;
}
private void sendMessage(OtpConnection connection, OtpErlangPid pid,
OtpErlangRef ref, OtpErlangAtom head, OtpErlangObject message)
throws IOException {
OtpErlangObject tResult = null;
if (head != null) {
tResult = new OtpErlangTuple(
new OtpErlangObject[] { head, message });
} else {
tResult = message;
}
OtpErlangObject msg = null;
msg = new OtpErlangTuple(new OtpErlangObject[] { ref, tResult });
connection.send(pid, msg);
}
private void handleRpc(OtpMsg msg) {
OtpErlangTuple request = null;
OtpErlangPid senderPid = null;
OtpErlangRef senderRef = null;
try {
OtpErlangTuple call = (OtpErlangTuple) msg.getMsg();
OtpErlangTuple from = (OtpErlangTuple) call.elementAt(1);
request = (OtpErlangTuple) call.elementAt(2);
senderPid = (OtpErlangPid) from.elementAt(0);
senderRef = (OtpErlangRef) from.elementAt(1);
String module = ((OtpErlangAtom) request.elementAt(1)).atomValue();
String function = ((OtpErlangAtom) request.elementAt(2))
.atomValue();
OtpErlangObject args = request.elementAt(3);
OtpErlangList argsList = null;
// normalize input
if (args instanceof OtpErlangList) {
argsList = (OtpErlangList) args;
} else {
argsList = new OtpErlangList(args);
}
if (!nodeElement.getBinding().getModule().equals(module)) {
// module not found
// TODO: externalize message?
OtpErlangObject errorMsg = MessageHelper.functionUndefMessage(
module, function, argsList,
"Module not found in SCA component.");
sendMessage(connection, senderPid, senderRef,
MessageHelper.ATOM_BADRPC, errorMsg);
} else {
// module found, looking for operation
RuntimeComponentService service = nodeElement.getService();
ErlangBinding binding = nodeElement.getBinding();
List<Operation> operations = service.getInterfaceContract()
.getInterface().getOperations();
Operation operation = null;
for (Operation o : operations) {
if (o.getName().equals(function)) {
operation = o;
break;
}
}
if (operation != null) {
// operation found
List<DataType> iTypes = operation.getInputType()
.getLogical();
Class<?>[] forClasses = new Class<?>[iTypes.size()];
for (int i = 0; i < iTypes.size(); i++) {
forClasses[i] = iTypes.get(i).getPhysical();
}
try {
// invoke operation
Method jmethod = ((JavaOperation) operation)
.getJavaMethod();
Object result = service.getRuntimeWire(binding,
service.getInterfaceContract()).invoke(
operation,
TypeHelpersProxy.toJavaFromList(argsList,
forClasses, jmethod
.getParameterAnnotations()));
OtpErlangObject response = null;
// send reply
if (operation.getOutputType() != null
&& operation.getOutputType().getPhysical()
.isArray()) {
// output type is array
Annotation[][] outNotes = new Annotation[][] { jmethod
.getAnnotations() };
response = TypeHelpersProxy.toErlangAsList(result,
outNotes);
} else if (operation.getOutputType() == null) {
// output type is void, create empty reply
Object[] arrArg = new Object[] {};
response = TypeHelpersProxy.toErlang(arrArg,
new Annotation[0][0]);
} else {
// output type is not void and not array
response = TypeHelpersProxy.toErlang(result,
jmethod.getAnnotations());
}
sendMessage(connection, senderPid, senderRef, null,
response);
} catch (Exception e) {
if ((e.getClass().equals(
InvocationTargetException.class) && e
.getCause().getClass().equals(
IllegalArgumentException.class))
|| e.getClass().equals(
TypeMismatchException.class)) {
// wrong params
// TODO: externalize message?
OtpErlangObject errorMsg = MessageHelper
.functionUndefMessage(module, function,
argsList,
"Operation name found in SCA component, but parameters types didn't match.");
sendMessage(connection, senderPid, senderRef,
MessageHelper.ATOM_BADRPC, errorMsg);
} else {
// unexpected error
throw e;
}
}
} else {
// operation not found
// TODO: externalize message?
OtpErlangObject errorMsg = MessageHelper
.functionUndefMessage(module, function, argsList,
"Operation name not found in SCA component.");
sendMessage(connection, senderPid, senderRef,
MessageHelper.ATOM_BADRPC, errorMsg);
}
}
} catch (ClassCastException e) {
// invalid request
// TODO: externalize message?
try {
logger
.log(
Level.WARNING,
"On node '"
+ nodeElement.getBinding().getNode()
+ "' received RPC request which is invalid. Request content is: "
+ msg.getMsg());
} catch (OtpErlangDecodeException e1) {
}
} catch (Exception e) {
// unknown error
try {
sendMessage(connection, senderPid, senderRef,
MessageHelper.ATOM_ERROR, new OtpErlangString(
"Unhandled error while processing request: "
+ e.getClass().getCanonicalName()
+ ", message: " + e.getMessage()));
} catch (Exception e1) {
// error while sending error message. Can't do anything now
logger.log(Level.WARNING, "Error during sending error message",
e);
}
}
}
private void handleMsg(OtpMsg msg) {
Operation matchedOperation = null;
Object args[] = null;
OtpErlangPid senderPid = null;
OtpErlangObject msgNoSender = null;
List<Operation> operations = groupedOperations.get(msg
.getRecipientName());
try {
if (msg.getMsg().getClass().equals(OtpErlangTuple.class)
&& (((OtpErlangTuple) msg.getMsg()).elementAt(0))
.getClass().equals(OtpErlangPid.class)) {
// PID provided by client
senderPid = (OtpErlangPid) ((OtpErlangTuple) msg.getMsg())
.elementAt(0);
msgNoSender = ((OtpErlangTuple) msg.getMsg()).elementAt(1);
} else {
// PID obtained from jinterface
senderPid = msg.getSenderPid();
msgNoSender = msg.getMsg();
}
} catch (Exception e) {
// TODO: check when this exception can occur
e.printStackTrace();
}
if (operations == null) {
// operation name not found
// TODO: externalize message?
// NOTE: I assume in Erlang sender doesn't get confirmation so
// no message will be send
logger.log(Level.WARNING, "Node '" + name
+ "' received message addressed to non exising mbox: "
+ msg.getRecipientName());
} else {
// find proper operation for received parameters
for (Operation operation : operations) {
Method method = ((JavaOperation) operation).getJavaMethod();
List<DataType> iTypes = operation.getInputType().getLogical();
Class<?>[] forClasses = new Class<?>[iTypes.size()];
for (int i = 0; i < iTypes.size(); i++) {
forClasses[i] = iTypes.get(i).getPhysical();
}
try {
args = TypeHelpersProxy.toJavaAsArgs(msgNoSender,
forClasses, method.getParameterAnnotations());
matchedOperation = operation;
break;
} catch (Exception e) {
// this exception is expected while processing operation
// version with mismatched arguments
}
}
if (matchedOperation != null) {
// operation found, invoke it
try {
Method jmethod = ((JavaOperation) matchedOperation)
.getJavaMethod();
Object result = nodeElement.getService().getRuntimeWire(
nodeElement.getBinding()).invoke(matchedOperation,
args);
OtpErlangObject response = null;
// create and send send reply
if (matchedOperation.getOutputType() != null
&& matchedOperation.getOutputType().getPhysical()
.isArray()) {
// result type is array
Annotation[][] outNotes = new Annotation[][] { jmethod
.getAnnotations() };
response = TypeHelpersProxy.toErlangAsList(result,
outNotes);
} else if (matchedOperation.getOutputType() != null) {
// result type is not array and not void
response = TypeHelpersProxy.toErlang(result, jmethod
.getAnnotations());
}
if (response != null && senderPid != null) {
connection.send(senderPid, response);
} else if (response != null && senderPid == null) {
// couldn't send reply - sender pid unavailable
// TODO: externalize message?
// TODO: do we need to send this reply?
logger
.log(
Level.WARNING,
"Cannot send reply - Erlang client didn't provide it's PID and couldn't obtain sender PID from jinterface");
}
} catch (InvocationTargetException e) {
if (e.getCause() != null
&& e.getCause().getClass().equals(
IllegalArgumentException.class)) {
// arguments number or type mismatch
try {
// TODO: externalize message?
connection
.send(
senderPid,
new OtpErlangString(
"Operation name found in SCA component, but parameters types didn't match."));
} catch (IOException e1) {
e1.printStackTrace();
}
} else {
// unknown/unhandled error
// TODO: decide what to do with this exception
e.printStackTrace();
}
} catch (Exception e) {
// FIXME: log this problem? use linking feature? send error?
e.printStackTrace();
}
} else {
// TODO: externalize message?
// NOTE: don't send error message if mapping not found
logger.log(Level.WARNING, "No mapping for such arguments in '"
+ msg.getRecipientName() + "' operation in '" + name
+ "' node. Recevied arguments: " + msgNoSender);
}
}
}
public void run() {
try {
// NOTE: there's also a timeout, like in reference bindings
OtpMsg msg = null;
if (nodeElement.getBinding().hasTimeout()) {
msg = connection.receiveMsg(nodeElement.getBinding()
.getTimeout());
} else {
msg = connection.receiveMsg();
}
// check if request is message or RPC
if (msg.getRecipientName().equals(MessageHelper.RPC_MBOX)
&& !nodeElement.getBinding().isMbox()) {
handleRpc(msg);
} else if (!msg.getRecipientName().equals(MessageHelper.RPC_MBOX)
&& nodeElement.getBinding().isMbox()) {
handleMsg(msg);
} else {
// received wrong message type
}
} catch (IOException e) {
// TODO: externalize message?
logger.log(Level.WARNING, "Problem while receiving message", e);
} catch (OtpErlangExit e) {
// TODO: linking?
} catch (OtpAuthException e) {
// TODO: cookies? does this exception occur sometime?
} catch (InterruptedException e) {
// NOTE: timeout will be logged
// TODO: externalize message?
logger.log(Level.WARNING, "Timeout while waiting for request", e);
} finally {
connection.close();
}
}
}
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