diff options
Diffstat (limited to 'sca-java-2.x/contrib/modules/binding-comet-runtime/src/main/java/org/apache/tuscany/sca/binding/comet/runtime/CometInvoker.java')
-rw-r--r-- | sca-java-2.x/contrib/modules/binding-comet-runtime/src/main/java/org/apache/tuscany/sca/binding/comet/runtime/CometInvoker.java | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/sca-java-2.x/contrib/modules/binding-comet-runtime/src/main/java/org/apache/tuscany/sca/binding/comet/runtime/CometInvoker.java b/sca-java-2.x/contrib/modules/binding-comet-runtime/src/main/java/org/apache/tuscany/sca/binding/comet/runtime/CometInvoker.java new file mode 100644 index 0000000000..6c3801f04d --- /dev/null +++ b/sca-java-2.x/contrib/modules/binding-comet-runtime/src/main/java/org/apache/tuscany/sca/binding/comet/runtime/CometInvoker.java @@ -0,0 +1,162 @@ +/* + * 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.comet.runtime; + +import java.io.BufferedReader; +import java.io.ByteArrayOutputStream; +import java.io.IOException; +import java.io.InputStream; +import java.io.InputStreamReader; + +import org.apache.commons.codec.EncoderException; +import org.apache.commons.codec.net.URLCodec; +import org.apache.http.HttpEntity; +import org.apache.http.HttpResponse; +import org.apache.http.client.HttpClient; +import org.apache.http.client.methods.HttpGet; +import org.apache.http.impl.client.DefaultHttpClient; +import org.apache.tuscany.sca.assembly.EndpointReference; +import org.apache.tuscany.sca.interfacedef.Operation; +import org.apache.tuscany.sca.invocation.Invoker; +import org.apache.tuscany.sca.invocation.Message; +import org.codehaus.jackson.JsonGenerationException; +import org.codehaus.jackson.JsonParseException; +import org.codehaus.jackson.map.JsonMappingException; +import org.codehaus.jackson.map.ObjectMapper; + +// TODO +public class CometInvoker implements Invoker { + + protected Operation operation; + protected EndpointReference endpoint; + + protected ObjectMapper mapper; // TODO: share mapper btw invoker and servlet or move to databinding + + public CometInvoker(Operation operation, EndpointReference endpoint) { + this.operation = operation; + this.endpoint = endpoint; + this.mapper = new ObjectMapper(); + } + + public Message invoke(Message msg) { + try { + + return doInvoke(msg); + + } catch (Exception e) { + throw new RuntimeException(e); + } + } + + public Message doInvoke(Message msg) throws JsonGenerationException, JsonMappingException, IOException, EncoderException { + String uri = endpoint.getBinding().getURI() + "/" + operation.getName(); + String[] jsonArgs = objectsToJSON((Object[])msg.getBody()); + + String responseJSON = invokeHTTPRequest(uri, jsonArgs); + + Object response = jsonToObjects(responseJSON)[0]; + msg.setBody(response); + + return msg; + } + + protected String invokeHTTPRequest(String url, String[] jsonArgs) throws IOException, EncoderException { + + HttpClient httpclient = new DefaultHttpClient(); + + + URLCodec uc = new URLCodec(); + for (int i=0 ; i<jsonArgs.length; i++) { + if (i == 0) { + url += '?'; + } else { + url += '&'; + } + url += "arg" + i + "="; + url += uc.encode(jsonArgs[i]); + } + + HttpGet httpget = new HttpGet(url); + + HttpResponse response = httpclient.execute(httpget); + + StringBuffer responseJSON = new StringBuffer(); + + HttpEntity entity = response.getEntity(); + + // If the response does not enclose an entity, there is no need + // to worry about connection release + if (entity != null) { + InputStream instream = entity.getContent(); + try { + + BufferedReader reader = new BufferedReader(new InputStreamReader(instream)); + String s = null; + while ((s = reader.readLine()) != null) { + responseJSON.append(s); + } + + } catch (IOException ex) { + + // In case of an IOException the connection will be released + // back to the connection manager automatically + throw ex; + + } catch (RuntimeException ex) { + + // In case of an unexpected exception you may want to abort + // the HTTP request in order to shut down the underlying + // connection and release it back to the connection manager. + httpget.abort(); + throw ex; + + } finally { + + // Closing the input stream will trigger connection release + instream.close(); + + } + + // When HttpClient instance is no longer needed, + // shut down the connection manager to ensure + // immediate deallocation of all system resources + httpclient.getConnectionManager().shutdown(); + } + + return responseJSON.toString(); + } + + protected String[] objectsToJSON(Object[] msgArgs) throws JsonGenerationException, JsonMappingException, IOException { + String[] jsonArgs = new String[msgArgs.length]; + for (int i=0; i<msgArgs.length; i++) { + ByteArrayOutputStream os = new ByteArrayOutputStream(); + mapper.writeValue(os , msgArgs[i]); + jsonArgs[i] = os.toString(); + } + return jsonArgs; + } + + protected Object[] jsonToObjects(String jsonRequest) throws JsonParseException, JsonMappingException, IOException { + Class<?> c = new Object[0].getClass(); + Object[] args = (Object[])mapper.readValue("[" + jsonRequest +"]", c); + return args; + } + +} |