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
|
/*
* Copyright (c) 2016 Cisco and/or its affiliates.
*
* Licensed 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 io.fd.vpp.jvpp;
import static io.fd.vpp.jvpp.NativeLibraryLoader.loadLibrary;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* JNI based representation of a management connection to VPP.
*/
public final class VppJNIConnection implements VppConnection {
private static final Logger LOG = Logger.getLogger(VppJNIConnection.class.getName());
static {
final String libName = "libjvpp_registry.so.0.0.0";
try {
loadLibrary(libName, VppJNIConnection.class);
} catch (IOException e) {
LOG.log(Level.SEVERE, String.format("Can't find vpp jni library: %s", libName), e);
throw new ExceptionInInitializerError(e);
}
}
private ConnectionInfo connectionInfo;
private final String clientName;
private volatile boolean disconnected = false;
/**
* Create VPPJNIConnection instance for client connecting to VPP.
*
* @param clientName client name instance to be used for communication. Single connection per clientName is
* allowed.
*/
public VppJNIConnection(final String clientName) {
this.clientName = Objects.requireNonNull(clientName, "Null clientName");
}
/**
* Guarded by VppJNIConnection.class
*/
private static final Map<String, VppJNIConnection> connections = new HashMap<>();
/**
* Initiate VPP connection for current instance
*
* Multiple instances are allowed since this class is not a singleton (VPP allows multiple management connections).
*
* However only a single connection per clientName is allowed.
*
* @throws IOException in case the connection could not be established
*/
@Override
public void connect() throws IOException {
_connect();
}
private void _connect() throws IOException {
synchronized (VppJNIConnection.class) {
if (connections.containsKey(clientName)) {
throw new IOException("Client " + clientName + " already connected");
}
connectionInfo = clientConnect(clientName);
if (connectionInfo.status != 0) {
throw new IOException("Connection returned error " + connectionInfo.status);
}
connections.put(clientName, this);
}
}
@Override
public final void checkActive() {
if (disconnected) {
throw new IllegalStateException("Disconnected client " + clientName);
}
}
@Override
public final synchronized void close() {
if (!disconnected) {
disconnected = true;
try {
clientDisconnect();
} finally {
synchronized (VppJNIConnection.class) {
connections.remove(clientName);
}
}
}
}
public ConnectionInfo getConnectionInfo() {
return connectionInfo;
}
/**
* VPP connection information used by plugins to reuse the connection.
*/
public static final class ConnectionInfo {
public final long queueAddress;
public final int clientIndex;
public final int status; // FIXME throw exception instead
public ConnectionInfo(long queueAddress, int clientIndex, int status) {
this.queueAddress = queueAddress;
this.clientIndex = clientIndex;
this.status = status;
}
}
private static native ConnectionInfo clientConnect(String clientName);
private static native void clientDisconnect();
}
|
