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
|
package com.orbekk.same;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.UnknownHostException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.googlecode.jsonrpc4j.ProxyUtil;
import com.orbekk.net.MyJsonRpcHttpClient;
import com.orbekk.paxos.PaxosService;
import com.orbekk.protobuf.RpcChannel;
public class ConnectionManagerImpl implements ConnectionManager {
private int connectionTimeout;
private int readTimeout;
private Map<String, MyJsonRpcHttpClient> connectionCache =
new HashMap<String, MyJsonRpcHttpClient>();
private ConcurrentMap<String, Future<RpcChannel>> channels =
new ConcurrentHashMap<String, Future<RpcChannel>>();
private Logger logger = LoggerFactory.getLogger(getClass());
/**
* @param connectionTimout Timeout for establishing connection in milliseconds.
* @param readTimeout Timeout for waiting for answer in milliseconds.
*/
public ConnectionManagerImpl(int connectionTimout, int readTimeout) {
this.connectionTimeout = connectionTimout;
this.readTimeout = readTimeout;
}
private MyJsonRpcHttpClient getConnection(String url)
throws MalformedURLException {
if (!connectionCache.containsKey(url)) {
connectionCache.put(url, new MyJsonRpcHttpClient(new URL(url),
connectionTimeout, readTimeout));
}
return connectionCache.get(url);
}
private <T>T getClassProxy(String url, Class<T> clazz) {
T service = null;
try {
MyJsonRpcHttpClient client = getConnection(url);
service = ProxyUtil.createProxy(
this.getClass().getClassLoader(),
clazz,
client);
} catch (MalformedURLException e) {
logger.warn("Unable to create client for {}, {}", url, e);
}
return service;
}
private RpcChannel getChannel(String location) {
Future<RpcChannel> channel = channels.get(location);
if (channel == null) {
final String hostname = location.split(":")[0];
final int port = Integer.valueOf(location.split(":")[1]);
Callable<RpcChannel> channelFactory =
new Callable<RpcChannel>() {
@Override public RpcChannel call() {
try {
return RpcChannel.create(hostname, port);
} catch (UnknownHostException e) {
logger.error("Could not connect: ", e);
return null;
} catch (IOException e) {
logger.error("Could not connect: ", e);
return null;
}
}
};
FutureTask<RpcChannel> task =
new FutureTask<RpcChannel>(channelFactory);
channel = channels.putIfAbsent(location, task);
if (channel == null) {
task.run();
channel = task;
}
}
try {
return channel.get();
} catch (ExecutionException e) {
logger.error("Could not connect: ", e);
return null;
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
return null;
}
}
@Override
public ClientService getClient(String url) {
return getClassProxy(url, ClientService.class);
}
@Override
public MasterService getMaster(String url) {
return getClassProxy(url, MasterService.class);
}
@Override
public PaxosService getPaxos(String url) {
return getClassProxy(url, PaxosService.class);
}
@Override
public Services.Directory getDirectory(String location) {
RpcChannel channel = getChannel(location);
if (channel != null) {
return Services.Directory.newStub(channel);
} else {
return null;
}
}
}
|
