001 package com.thetransactioncompany.jsonrpc2.server.examples;
002
003
004 import java.text.*;
005 import java.util.*;
006
007 import com.thetransactioncompany.jsonrpc2.*;
008 import com.thetransactioncompany.jsonrpc2.server.*;
009
010
011 /**
012 * Demonstrates use of the JSON-RPC 2.0 Server framework. The request handlers
013 * are implemented as static nested classes for convenience.
014 *
015 * @author Vladimir Dzhuvinov
016 */
017 public class Example {
018
019
020 // Implements a handler for an "echo" JSON-RPC method
021 public static class EchoHandler implements RequestHandler {
022
023
024 // Reports the method names of the handled requests
025 public String[] handledRequests() {
026
027 return new String[]{"echo"};
028 }
029
030
031 // Processes the requests
032 public JSONRPC2Response process(JSONRPC2Request req, MessageContext ctx) {
033
034 if (req.getMethod().equals("echo")) {
035
036 // Echo first parameter
037
038 List params = (List)req.getParams();
039
040 Object input = params.get(0);
041
042 return new JSONRPC2Response(input, req.getID());
043 }
044 else {
045 // Method name not supported
046
047 return new JSONRPC2Response(JSONRPC2Error.METHOD_NOT_FOUND, req.getID());
048 }
049 }
050 }
051
052
053 // Implements a handler for "getDate" and "getTime" JSON-RPC methods
054 // that return the current date and time
055 public static class DateTimeHandler implements RequestHandler {
056
057
058 // Reports the method names of the handled requests
059 public String[] handledRequests() {
060
061 return new String[]{"getDate", "getTime"};
062 }
063
064
065 // Processes the requests
066 public JSONRPC2Response process(JSONRPC2Request req, MessageContext ctx) {
067
068 if (req.getMethod().equals("getDate")) {
069
070 DateFormat df = DateFormat.getDateInstance();
071
072 String date = df.format(new Date());
073
074 return new JSONRPC2Response(date, req.getID());
075 }
076 else if (req.getMethod().equals("getTime")) {
077
078 DateFormat df = DateFormat.getTimeInstance();
079
080 String time = df.format(new Date());
081
082 return new JSONRPC2Response(time, req.getID());
083 }
084 else {
085
086 // Method name not supported
087
088 return new JSONRPC2Response(JSONRPC2Error.METHOD_NOT_FOUND, req.getID());
089 }
090 }
091 }
092
093
094 public static void main(String[] args) {
095
096 // Create a new JSON-RPC 2.0 request dispatcher
097 Dispatcher dispatcher = new Dispatcher();
098
099
100 // Register the "echo", "getDate" and "getTime" handlers with it
101 dispatcher.register(new EchoHandler());
102 dispatcher.register(new DateTimeHandler());
103
104 // Simulate an "echo" JSON-RPC 2.0 request
105 List echoParam = new LinkedList();
106 echoParam.add("Hello world!");
107
108 JSONRPC2Request req = new JSONRPC2Request("echo", echoParam, "req-id-01");
109 System.out.println("Request: \n" + req);
110
111 JSONRPC2Response resp = dispatcher.process(req, null);
112 System.out.println("Response: \n" + resp);
113
114
115 // Simulate a "getDate" JSON-RPC 2.0 request
116 req = new JSONRPC2Request("getDate", "req-id-02");
117 System.out.println("Request: \n" + req);
118
119 resp = dispatcher.process(req, null);
120 System.out.println("Response: \n" + resp);
121
122
123 // Simulate a "getTime" JSON-RPC 2.0 request
124 req = new JSONRPC2Request("getTime", "req-id-03");
125 System.out.println("Request: \n" + req);
126
127 resp = dispatcher.process(req, null);
128 System.out.println("Response: \n" + resp);
129 }
130 }