1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/*
* 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.jsonp.runtime;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.runtime.RuntimeEndpoint;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
public class JSONPServlet extends GenericServlet {
private static final long serialVersionUID = 1L;
protected transient RuntimeEndpoint wire;
protected transient Operation operation;
protected transient ObjectMapper mapper;
public JSONPServlet(RuntimeEndpoint wire, Operation operation) {
this.wire = wire;
this.operation = operation;
this.mapper = new ObjectMapper();
}
@Override
public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
//String jsonRequest = getJSONRequest(servletRequest);
//Object[] args = jsonToObjects(jsonRequest);
Object[] args = getJSONRequestStringArray(servletRequest);
Object response = invokeService(args);
//String jsonResponse = getJSONResponse(servletRequest, response);
String jsonResponse = getJSONResponseAsString(servletRequest, response);
servletResponse.getOutputStream().println(jsonResponse);
}
/**
* Turn the request into JSON
*/
/* Not required now JSON conversion is delegated to databinding
protected String getJSONRequest(ServletRequest servletRequest) throws IOException, JsonParseException, JsonMappingException {
List<DataType> types = operation.getInputType().getLogical();
int typesIndex = 0;
String jsonRequest = "";
for (String name : getOrderedParameterNames(servletRequest)) {
if (!name.startsWith("_") && !"callback".equals(name)) {
if (jsonRequest.length() > 1) {
jsonRequest += ", ";
}
// automatically quote string parammeters so clients work in the usual javascript way
if (typesIndex < types.size() && String.class.equals(types.get(typesIndex).getGenericType())) {
String x = servletRequest.getParameter(name);
// TODO: do this more properly
if (!x.startsWith("\"")) {
jsonRequest += "\"" + x + "\"";
} else {
jsonRequest += x;
}
} else {
jsonRequest += servletRequest.getParameter(name);
}
}
}
return "[" + jsonRequest + "]";
}
*/
/**
* Turn the request into a string array of JSON structures. The Databinding
* layer will then convert each of the individual parameters into the appropriate
* types for the implementation interface
*
*/
protected Object[] getJSONRequestStringArray(ServletRequest servletRequest) throws IOException, JsonParseException, JsonMappingException {
List<DataType> types = operation.getInputType().getLogical();
int typesIndex = 0;
List<String> jsonRequestArray = new ArrayList<String>();
for (String name : getOrderedParameterNames(servletRequest)) {
String jsonRequest = "";
if (!name.startsWith("_") && !"callback".equals(name)) {
// automatically quote string parameters so clients work in the usual javascript way
if (typesIndex < types.size() && String.class.equals(types.get(typesIndex++).getGenericType())) {
String x = servletRequest.getParameter(name);
// TODO: do this more properly
if (!x.startsWith("\"")) {
jsonRequest += "\"" + x + "\"";
} else {
jsonRequest += x;
}
} else {
jsonRequest += servletRequest.getParameter(name);
}
jsonRequestArray.add(jsonRequest);
}
}
return jsonRequestArray.toArray();
}
/**
* Get the request parameter names in the correct order.
* The request args need to be in the correct order to invoke the service so work out the
* order from the order in the query string. Eg, the url:
* http://localhost:8085/HelloWorldService/sayHello2?first=petra&last=arnold&callback=foo"
* should invoke:
* sayHello2("petra", "arnold")
* so the parameter names should be ordered: "first", "last"
*/
protected SortedSet<String> getOrderedParameterNames(ServletRequest servletRequest) {
final String queryString = ((HttpServletRequest)servletRequest).getQueryString();
SortedSet<String> sortedNames = new TreeSet<String>(new Comparator<String>(){
public int compare(String o1, String o2) {
int i = queryString.indexOf(o1);
int j = queryString.indexOf(o2);
return i - j;
}});
Set<String> parameterNames = servletRequest.getParameterMap().keySet();
for (String name : parameterNames) {
sortedNames.add(name);
}
return sortedNames;
}
/**
* Turn the response object into JSON
*/
/* Not required now JSON conversion is delegated to databinding
protected String getJSONResponse(ServletRequest servletRequest, Object response) throws IOException, JsonParseException {
ByteArrayOutputStream os = new ByteArrayOutputStream();
mapper.writeValue(os , response);
String jsonResponse = os.toString();
String callback = servletRequest.getParameter("callback");
if (callback != null && callback.length() > 1) {
jsonResponse = callback + "(" + jsonResponse + ");";
}
return jsonResponse;
}
*/
/**
* The databinding layer will have converterted the return type into a JSON string so simply
* add wrap it for return.
*/
protected String getJSONResponseAsString(ServletRequest servletRequest, Object response) throws IOException, JsonParseException {
String jsonResponse = response.toString();
String callback = servletRequest.getParameter("callback");
if (callback != null && callback.length() > 1) {
jsonResponse = callback + "(" + jsonResponse + ");";
}
return jsonResponse;
}
/**
* Turn the request JSON into objects
*/
/* Not required now JSON conversion is delegated to databinding
protected Object[] jsonToObjects(String jsonRequest) throws IOException, JsonParseException, JsonMappingException {
Class<?> c = new Object[0].getClass();
Object[] args = (Object[])mapper.readValue(jsonRequest, c);
return args;
}
*/
/**
* Send the request down the wire to invoke the service
*/
protected Object invokeService(Object[] args) {
try {
return wire.invoke(operation, args);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
}
}
|
