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
|
/*
* 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.thrift.server;
import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Map;
import org.apache.thrift.TException;
import org.apache.thrift.TProcessor;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.protocol.TProtocolFactory;
import org.apache.thrift.transport.TIOStreamTransport;
import org.apache.thrift.transport.TTransport;
/**
* Servlet implementation class ThriftServer, that allows {@link TProcessor} and {@link
* TProtocolFactory} to be supplied after the {@link #init()} method has finished. <br>
* Subclasses must implement the abstract methods that return the TProcessor and two
* TProtocolFactory. Those methods are guaranteed to be called exactly once, and that {@link
* ServletContext} is available.
*/
public abstract class TExtensibleServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private TProcessor processor;
private TProtocolFactory inFactory;
private Collection<Map.Entry<String, String>> customHeaders;
/**
* Returns the appropriate {@link TProcessor}. This will be called <b>once</b> just after the
* {@link #init()} method
*
* @return the appropriate {@link TProcessor}
*/
protected abstract TProcessor getProcessor();
/**
* Returns the appropriate in {@link TProtocolFactory}. This will be called <b>once</b> just after
* the {@link #init()} method
*
* @return the appropriate in {@link TProtocolFactory}
*/
protected abstract TProtocolFactory getInProtocolFactory();
/**
* Returns the appropriate out {@link TProtocolFactory}. This will be called <b>once</b> just
* after the {@link #init()} method
*
* @return the appropriate out {@link TProtocolFactory}
*/
protected abstract TProtocolFactory getOutProtocolFactory();
@Override
public final void init(ServletConfig config) throws ServletException {
super.init(config); // no-args init() happens here
this.processor = getProcessor();
this.inFactory = getInProtocolFactory();
TProtocolFactory outFactory = getOutProtocolFactory();
this.customHeaders = new ArrayList<Map.Entry<String, String>>();
if (processor == null) {
throw new ServletException("processor must be set");
}
if (inFactory == null) {
throw new ServletException("inFactory must be set");
}
if (outFactory == null) {
throw new ServletException("outFactory must be set");
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
TTransport inTransport;
TTransport outTransport;
try {
response.setContentType("application/x-thrift");
if (null != this.customHeaders) {
for (Map.Entry<String, String> header : this.customHeaders) {
response.addHeader(header.getKey(), header.getValue());
}
}
InputStream in = request.getInputStream();
OutputStream out = response.getOutputStream();
TTransport transport = new TIOStreamTransport(in, out);
inTransport = transport;
outTransport = transport;
TProtocol inProtocol = inFactory.getProtocol(inTransport);
TProtocol outProtocol = inFactory.getProtocol(outTransport);
processor.process(inProtocol, outProtocol);
out.flush();
} catch (TException te) {
throw new ServletException(te);
}
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doPost(req, resp);
}
public void addCustomHeader(final String key, final String value) {
this.customHeaders.add(
new Map.Entry<String, String>() {
@Override
public String getKey() {
return key;
}
@Override
public String getValue() {
return value;
}
@Override
public String setValue(String value) {
return null;
}
});
}
public void setCustomHeaders(Collection<Map.Entry<String, String>> headers) {
this.customHeaders.clear();
this.customHeaders.addAll(headers);
}
}
|
