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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.reflect.InvocationTargetException;
import java.util.List;
import java.util.Map;
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.runtime.RuntimeComponentService;
import com.ericsson.otp.erlang.OtpConnection;
import com.ericsson.otp.erlang.OtpErlangAtom;
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;
public class RpcExecutor implements Runnable {
private Map<String, RuntimeComponentService> services;
private Map<String, ErlangBinding> bindings;
private OtpConnection connection;
private static final OtpErlangAtom OK = new OtpErlangAtom("ok");
private static final OtpErlangAtom ERROR = new OtpErlangAtom("error");
private static final OtpErlangAtom BADRPC = new OtpErlangAtom("badrpc");
public RpcExecutor(Map<String, RuntimeComponentService> services, Map<String, ErlangBinding> bindings,
OtpConnection connection) {
this.bindings = bindings;
this.services = services;
this.connection = connection;
}
private void sendMessage(OtpConnection connection, OtpErlangPid pid,
OtpErlangRef ref, OtpErlangAtom head, OtpErlangObject message)
throws IOException {
OtpErlangTuple tResult = new OtpErlangTuple(new OtpErlangObject[] {
head, message });
OtpErlangObject msg = null;
msg = new OtpErlangTuple(new OtpErlangObject[] { ref, tResult });
connection.send(pid, msg);
}
public void run() {
OtpErlangTuple request = null;
OtpErlangPid senderPid = null;
OtpErlangRef senderRef = null;
try {
OtpErlangTuple call = (OtpErlangTuple) connection.receive();
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;
if (args instanceof OtpErlangList) {
argsList = (OtpErlangList) args;
} else {
argsList = new OtpErlangList(args);
}
if (!services.containsKey(module)) {
// TODO: externalize message?
OtpErlangObject errorMsg = MessageHelper.functionUndefMessage(
module, function, argsList,
"Module not found in SCA component.");
sendMessage(connection, senderPid, senderRef, BADRPC, errorMsg);
} else {
RuntimeComponentService service = services.get(module);
ErlangBinding binding = bindings.get(module);
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) {
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 {
Object result = service.getRuntimeWire(binding).invoke(
operation,
TypeHelpersProxy.toJavaFromList(argsList,
forClasses));
OtpErlangObject response = null;
if (operation.getOutputType() != null
&& operation.getOutputType().getPhysical()
.isArray()) {
response = TypeHelpersProxy.toErlangAsList(result);
} else if (operation.getOutputType() == null) {
Object[] arrArg = new Object[] {};
response = TypeHelpersProxy.toErlang(arrArg);
} else {
Object[] arrArg = new Object[] { result };
response = TypeHelpersProxy.toErlang(arrArg);
}
sendMessage(connection, senderPid, senderRef, OK,
response);
} catch (Exception e) {
if ((e.getClass().equals(
InvocationTargetException.class) && e
.getCause().getClass().equals(
IllegalArgumentException.class))
|| e.getClass().equals(
TypeMismatchException.class)) {
// 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,
BADRPC, errorMsg);
} else {
throw e;
}
}
} else {
// TODO: externalize message?
OtpErlangObject errorMsg = MessageHelper
.functionUndefMessage(module, function, argsList,
"Operation name not found in SCA component.");
sendMessage(connection, senderPid, senderRef, BADRPC,
errorMsg);
}
}
} catch (Exception e) {
// TODO: distinguish and describe errors!
try {
e.printStackTrace();
sendMessage(connection, senderPid, senderRef, ERROR,
new OtpErlangString(
"Unhandled error while processing request: "
+ e.getClass().getCanonicalName()
+ ", message: " + e.getMessage()));
} catch (IOException e1) {
// error while sending error message. Can't do anything now
}
} finally {
connection.close();
}
}
}
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