diff options
Diffstat (limited to 'sandbox/wjaniszewski/binding-erlang-runtime/src/main/java/org/apache/tuscany/sca/binding/erlang/impl/RpcExecutor.java')
| -rw-r--r-- | sandbox/wjaniszewski/binding-erlang-runtime/src/main/java/org/apache/tuscany/sca/binding/erlang/impl/RpcExecutor.java | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/sandbox/wjaniszewski/binding-erlang-runtime/src/main/java/org/apache/tuscany/sca/binding/erlang/impl/RpcExecutor.java b/sandbox/wjaniszewski/binding-erlang-runtime/src/main/java/org/apache/tuscany/sca/binding/erlang/impl/RpcExecutor.java new file mode 100644 index 0000000000..3940c34b7b --- /dev/null +++ b/sandbox/wjaniszewski/binding-erlang-runtime/src/main/java/org/apache/tuscany/sca/binding/erlang/impl/RpcExecutor.java @@ -0,0 +1,143 @@ +/* + * 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.util.List; + +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 RuntimeComponentService service; + private ErlangBinding binding; + private OtpConnection connection; + + private static final OtpErlangAtom OK = new OtpErlangAtom("ok"); + private static final OtpErlangAtom ERROR = new OtpErlangAtom("error"); + + public RpcExecutor(RuntimeComponentService service, ErlangBinding binding, OtpConnection connection) { + this.service = service; + this.binding = binding; + 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; + if (ref != null) { + msg = new OtpErlangTuple(new OtpErlangObject[] {ref, tResult}); + } else { + msg = tResult; + } + connection.send(pid, msg); + } + + public void run() { + OtpErlangTuple request = null; + OtpErlangPid senderPid = null; + OtpErlangRef senderRef = null; + try { + OtpErlangTuple call = (OtpErlangTuple)connection.receive(); + if (call.arity() == 2) { + // is call from jinterface library + senderPid = (OtpErlangPid)call.elementAt(0); + request = (OtpErlangTuple)call.elementAt(1); + } else { + // is call from native *erl* console + 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 (!binding.getModule().equals(module)) { + sendMessage(connection, senderPid, senderRef, ERROR, new OtpErlangString("No such module")); + } else { + 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(); + } + 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); + } else { + sendMessage(connection, senderPid, senderRef, ERROR, new OtpErlangString("No such operation")); + } + } + } catch (Exception e) { + // TODO: distinguish and describe errors! + try { + sendMessage(connection, senderPid, senderRef, ERROR, new OtpErlangString("Error while processing request")); + } catch (IOException e1) { + // error while sending error message. Can't do anything now + } + } finally { + connection.close(); + } + } + +} |