diff options
Diffstat (limited to 'sca-java-1.x/branches/sca-java-1.2.1/modules/binding-jsonrpc/src/main/java/org/apache/tuscany/sca/binding/jsonrpc/JSONRPCServiceServlet.java')
-rw-r--r-- | sca-java-1.x/branches/sca-java-1.2.1/modules/binding-jsonrpc/src/main/java/org/apache/tuscany/sca/binding/jsonrpc/JSONRPCServiceServlet.java | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/sca-java-1.x/branches/sca-java-1.2.1/modules/binding-jsonrpc/src/main/java/org/apache/tuscany/sca/binding/jsonrpc/JSONRPCServiceServlet.java b/sca-java-1.x/branches/sca-java-1.2.1/modules/binding-jsonrpc/src/main/java/org/apache/tuscany/sca/binding/jsonrpc/JSONRPCServiceServlet.java new file mode 100644 index 0000000000..a351aaa025 --- /dev/null +++ b/sca-java-1.x/branches/sca-java-1.2.1/modules/binding-jsonrpc/src/main/java/org/apache/tuscany/sca/binding/jsonrpc/JSONRPCServiceServlet.java @@ -0,0 +1,283 @@ +/* + * 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.jsonrpc; + +import java.io.BufferedReader; +import java.io.CharArrayWriter; +import java.io.IOException; +import java.io.InputStreamReader; +import java.io.OutputStream; +import java.io.UnsupportedEncodingException; +import java.lang.reflect.InvocationTargetException; +import java.util.List; + +import javax.servlet.ServletConfig; +import javax.servlet.http.HttpServletRequest; +import javax.servlet.http.HttpServletResponse; +import javax.servlet.http.HttpSession; + +import org.apache.tuscany.sca.assembly.Binding; +import org.apache.tuscany.sca.interfacedef.InterfaceContract; +import org.apache.tuscany.sca.interfacedef.Operation; +import org.apache.tuscany.sca.runtime.RuntimeComponentService; +import org.apache.tuscany.sca.runtime.RuntimeWire; +import org.json.JSONArray; +import org.json.JSONObject; +import org.osoa.sca.ServiceRuntimeException; + +import com.metaparadigm.jsonrpc.JSONRPCBridge; +import com.metaparadigm.jsonrpc.JSONRPCServlet; + +/** + * Servlet that handles JSON-RPC requests invoking SCA services. + * + * There is an instance of this servlet for each <binding.jsonrpc> + */ +public class JSONRPCServiceServlet extends JSONRPCServlet { + private static final long serialVersionUID = 1L; + + transient Binding binding; + transient String serviceName; + transient Object serviceInstance; + transient RuntimeComponentService componentService; + transient InterfaceContract serviceContract; + transient Class<?> serviceInterface; + + public JSONRPCServiceServlet(Binding binding, + RuntimeComponentService componentService, + InterfaceContract serviceContract, + Class<?> serviceInterface, + Object serviceInstance) { + this.binding = binding; + this.serviceName = binding.getName(); + this.componentService = componentService; + this.serviceContract = serviceContract; + this.serviceInterface = serviceInterface; + this.serviceInstance = serviceInstance; + } + + /** + * Override to do nothing as the JSONRPCServlet is setup by the + * service method in this class. + */ + @Override + public void init(ServletConfig config) { + } + + @Override + public void service(HttpServletRequest request, HttpServletResponse response) throws IOException { + if ("smd".equals(request.getQueryString())) { + handleSMDRequest(request, response); + } else { + try { + handleServiceRequest(request, response); + } finally { + HttpSession session = request.getSession(false); + if (session != null) { + session.removeAttribute("JSONRPCBridge"); + } + } + } + } + + private void handleServiceRequest(HttpServletRequest request, HttpServletResponse response) + throws IOException { + // Encode using UTF-8, although We are actually ASCII clean as + // all unicode data is JSON escaped using backslash u. This is + // less data efficient for foreign character sets but it is + // needed to support naughty browsers such as Konqueror and Safari + // which do not honour the charset set in the response + response.setContentType("text/plain;charset=utf-8"); + OutputStream out = response.getOutputStream(); + + // Decode using the charset in the request if it exists otherwise + // use UTF-8 as this is what all browser implementations use. + // The JSON-RPC-Java JavaScript client is ASCII clean so it + // although here we can correctly handle data from other clients + // that do not escape non ASCII data + String charset = request.getCharacterEncoding(); + if (charset == null) { + charset = "UTF-8"; + } + BufferedReader in = new BufferedReader(new InputStreamReader(request.getInputStream(), charset)); + + // Read the request + CharArrayWriter data = new CharArrayWriter(); + char buf[] = new char[4096]; + int ret; + while ((ret = in.read(buf, 0, 4096)) != -1) { + data.write(buf, 0, ret); + } + + JSONObject jsonReq = null; + String method = null; + try { + jsonReq = new JSONObject(data.toString()); + method = jsonReq.getString("method"); + } catch (Exception e) { + //FIXME Exceptions are not handled correctly here + // They should be reported to the client JavaScript as proper + // JavaScript exceptions. + throw new RuntimeException("Unable to parse request", e); + } + + + // check if it's a system request + // or a method invocation + byte[] bout; + if (method.startsWith("system.")) { + bout = handleJSONRPCSystemInvocation(request, response, data.toString()); + } else { + bout = handleJSONRPCMethodInvocation(request, response, jsonReq); + } + + // Send response to client + out.write(bout); + out.flush(); + out.close(); + } + + /** + * handles requests for the SMD descriptor for a service + */ + protected void handleSMDRequest(HttpServletRequest request, HttpServletResponse response) throws IOException, + UnsupportedEncodingException { + String serviceUrl = request.getRequestURL().toString(); + String smd = JavaToSmd.interfaceToSmd(serviceInterface, serviceUrl); + + response.setContentType("text/plain;charset=utf-8"); + OutputStream out = response.getOutputStream(); + byte[] bout = smd.getBytes("UTF-8"); + + out.write(bout); + out.flush(); + out.close(); + } + + protected byte[] handleJSONRPCSystemInvocation(HttpServletRequest request, HttpServletResponse response, String requestData) throws IOException, + UnsupportedEncodingException { + /* + * Create a new bridge for every request to avoid all the problems with + * JSON-RPC-Java storing the bridge in the session + */ + HttpSession session = request.getSession(); + + JSONRPCBridge jsonrpcBridge = new JSONRPCBridge(); + jsonrpcBridge.registerObject("Service", serviceInstance, serviceInterface); + session.setAttribute("JSONRPCBridge", jsonrpcBridge); + + org.json.JSONObject jsonReq = null; + com.metaparadigm.jsonrpc.JSONRPCResult jsonResp = null; + try { + jsonReq = new org.json.JSONObject(requestData); + } catch (java.text.ParseException e) { + throw new RuntimeException("Unable to parse request", e); + } + + String method = jsonReq.getString("method"); + if ((method != null) && (method.indexOf('.') < 0)) { + jsonReq.putOpt("method", "Service" + "." + method); + } + + // invoke the request + jsonResp = jsonrpcBridge.call(new Object[] {request}, jsonReq); + + return jsonResp.toString().getBytes("UTF-8"); + } + + protected byte[] handleJSONRPCMethodInvocation(HttpServletRequest request, HttpServletResponse response, JSONObject jsonReq) throws IOException, + UnsupportedEncodingException { + + String method = null; + Object[] args = null; + Object id = null; + try { + // Extract the method + method = jsonReq.getString("method"); + if ((method != null) && (method.indexOf('.') < 0)) { + jsonReq.putOpt("method", "Service" + "." + method); + } + + // Extract the arguments + JSONArray array = jsonReq.getJSONArray("params"); + args = new Object[array.length()]; + for (int i = 0; i < args.length; i++) { + args[i] = array.get(i); + } + id = jsonReq.get("id"); + + } catch (Exception e) { + throw new RuntimeException("Unable to find json method name", e); + } + + // invoke the request + RuntimeWire wire = componentService.getRuntimeWire(binding, serviceContract); + Operation jsonOperation = findOperation(method); + Object result = null; + JSONObject jsonResponse = new JSONObject(); + try { + result = wire.invoke(jsonOperation, args); + try { + jsonResponse.put("result", result); + jsonResponse.putOpt("id", id); + } catch (Exception e) { + throw new ServiceRuntimeException(e); + } + } catch (InvocationTargetException e) { + try { + jsonResponse.put("error", e.getCause()); + jsonResponse.putOpt("id", id); + } catch (Exception e1) { + throw new ServiceRuntimeException(e); + } + } catch(RuntimeException e) { + e.printStackTrace(); + throw e; + } + + //get response to send to client + return jsonResponse.toString().getBytes("UTF-8"); + } + + /** + * Find the operation from the component service contract + * @param componentService + * @param method + * @return + */ + private Operation findOperation(String method) { + if (method.contains(".")) { + method = method.substring(method.lastIndexOf(".") + 1); + } + + List<Operation> operations = serviceContract.getInterface().getOperations(); + //componentService.getBindingProvider(binding).getBindingInterfaceContract().getInterface().getOperations(); + + + Operation result = null; + for (Operation o : operations) { + if (o.getName().equalsIgnoreCase(method)) { + result = o; + break; + } + } + + return result; + } +} |