Tutoriel du client Java Memcached utilisant les bibliothèques whalin.Memcached-Java-Client et googlecode.xmemcached

Publié: 2019-09-01
Tutoriel du client Java Memcached utilisant les bibliothèques whalin et googlecode.xmemcached

Ceci est la suite du tutoriel sur Memcached which is distributed memory object caching server . Voici les deux tutoriels précédents avant de passer en revue celui-ci.

  • Comment installer et configurer Memcached
  • Tutoriel du client Java Memcached utilisant la bibliothèque net.spy.spymemcached

Dans ce didacticiel, nous allons passer en revue le client Java Memcached en utilisant les deux approches ci-dessous :

com.whalin.Memcached-Java-Client Library

1
2
3
4
5
< dependency >
< groupId > com . whalin < / groupId >
< artifactId > Memcached - Java - Client < / artifactId >
< version > 3.0.2 < / version >
< / dependency >

Bibliothèque com.googlecode.xmemcached

1
2
3
4
5
< dependency >
< groupId > com . googlecode . xmemcached < / groupId >
< artifactId > xmemcached < / artifactId >
< version > 2.4.5 < / version >
< / dependency >

Ajoutez simplement ces deux dépendances maven au fichier pom.xml de votre projet pour obtenir la bibliothèque dans votre espace de travail Eclipse.

Voici un programme CrunchifyComWhalinXMemcachedClient.java complet avec tous les détails.

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
package crunchify . java . tutorials ;
 
import java . io . IOException ;
import java . util . concurrent . TimeoutException ;
 
import com . whalin . MemCached . MemCachedClient ;
import com . whalin . MemCached . SockIOPool ;
 
import net . rubyeye . xmemcached . XMemcachedClient ;
import net . rubyeye . xmemcached . exception . MemcachedException ;
 
/**
* @author Crunchify.com
* Version: 1.2.4
* Details: Use dependency com.whalin.Memcached-Java-Client and com.googlecode.xmemcached to retrieve, store Key Value pair
*         from MemCached Server
*/
 
public class CrunchifyComWhalinXMemcachedClient {
public static void main ( String [ ] args ) {
 
log ( "===================================== Approach-1: Using SpyMemcahed: https://crunchify.com/memcached-java-client-net-spy-spymemcached/ ===================================== \n" ) ;
 
log ( "===================================== Approach-2: Using com.whalin.Memcached-Java-Client =====================================\n" ) ;
implementWhalinMemcachedJavaClient ( ) ;
 
log ( "===================================== Approach-3: Using com.googlecode.xmemcached Method =====================================\n" ) ;
implementXMemCachedClient ( ) ;
 
log ( "===================================== Program Completed ===================================== \n" ) ;
 
}
 
// Approach-1: Using SpyMemcahed: https://crunchify.com/memcached-java-client-net-spy-spymemcached/
 
// Approach-2: Using com.whalin.Memcached-Java-Client
private static void implementWhalinMemcachedJavaClient ( ) {
String [ ] servers = { "localhost:11211" } ;
 
// This class is a connection pool for maintaning a pool of persistent connections to memcached servers.
// The pool must be initialized prior to use. This should typically be early on in the lifecycle of the JVM instance.
SockIOPool crunchfiyPool = SockIOPool . getInstance ( "Crunchify" ) ;
 
// Sets the minimum number of spare connections to maintain in our available pool.
crunchfiyPool . setMinConn ( 2 ) ;
 
// Sets the maximum number of spare connections allowed in our available pool.
crunchfiyPool . setMaxConn ( 20 ) ;
 
// Sets the list of all cache servers.
crunchfiyPool . setServers ( servers ) ;
 
// Sets the failover flag for the pool. If this flag is set to true, and a socket fails to connect, the pool will attempt to return a socket from
// another server if one exists.
// If set to false, then getting a socket will return null if it fails to connect to the requested server.
crunchfiyPool . setFailover ( true ) ;
 
// Sets the initial number of connections per server in the available pool.
crunchfiyPool . setInitConn ( 30 ) ;
 
// Set the sleep time between runs of the pool maintenance thread. If set to 0, then the maint thread will not be started.
crunchfiyPool . setMaintSleep ( 90 ) ;
 
// Sets the socket timeout for reads.
crunchfiyPool . setSocketTO ( 2000 ) ;
 
// Sets the aliveCheck flag for the pool. When true, this will attempt to talk to the server on every connection checkout to make sure the connection is
// still valid.
crunchfiyPool . setAliveCheck ( true ) ;
 
crunchfiyPool . initialize ( ) ;
 
// Creates a new instance of MemCachedClient accepting a passed in pool name.
MemCachedClient crunchifyWhalinClient = new MemCachedClient ( "Crunchify" ) ;
 
// Adds data to the server; only the key and the value are specified.
crunchifyWhalinClient . add ( "Java" , "Crunchify.com" ) ;
crunchifyWhalinClient . add ( "WordPress" , "WordPress.com" ) ;
crunchifyWhalinClient . add ( "Social" , "Facebook.com" ) ;
 
log ( "==> Total 3 Records added to MemCached using com.whalin.Memcached-Java-Client Method\n" ) ;
 
// Retrieve a key from the server, using a specific hash.
// If the data was compressed or serialized when compressed, it will automatically be decompressed or serialized, as appropriate..
log ( "Key: Java, Value: " + crunchifyWhalinClient . get ( "Java" ) ) ;
log ( "Key: WordPress, Value: " + crunchifyWhalinClient . get ( "WordPress" ) ) ;
log ( "Key: Social, Value: " + crunchifyWhalinClient . get ( "Social" ) ) ;
 
log ( "==> Total 3 Records Retrieved from MemCached using com.whalin.Memcached-Java-Client Method\n" ) ;
 
// Deletes an object from cache given cache key.
crunchifyWhalinClient . delete ( "Social" ) ;
log ( "==> Record deleted using com.whalin.Memcached-Java-Client Method\n" ) ;
 
log ( "Key: Social, Value: " + crunchifyWhalinClient . get ( "Social" ) ) ;
log ( "==> Failure to get record Social as we deleted that before\n" ) ;
 
}
 
// Approach-3: Using com.googlecode.xmemcached
private static void implementXMemCachedClient ( ) {
String city = "New York" ;
String city2 = "San Francisco" ;
try {
 
// XMemcached constructor,default weight is 1
XMemcachedClient xMemCachedclient = new XMemcachedClient ( "localhost" , 11211 ) ;
 
// Set a value
xMemCachedclient . set ( "Crunchify" , 3600 , city ) ;
xMemCachedclient . set ( "Twitter" , 3600 , city2 ) ;
 
// Get a value for specify key
Object myCity = xMemCachedclient . get ( "Twitter" ) ;
log ( "=====> Key: Twitter, Value: " + xMemCachedclient . get ( "Twitter" ) + "\n" ) ;
 
// Get a value for specify key (set timeout of three seconds)
myCity = xMemCachedclient . get ( "Crunchify" , 3000 ) ;
log ( "=====> Key: Crunchify, Value: " + xMemCachedclient . get ( "Crunchify" , 3000 ) + "\n" ) ;
 
// Set a new expiration time for an existing item,using default opTimeout second.
xMemCachedclient . touch ( "key" , 30 ) ;
 
xMemCachedclient . delete ( "Crunchify" ) ;
log ( "=====> Key: Crunchify, Value: " + xMemCachedclient . get ( "Crunchify" ) + "\n" ) ;
 
// delete value
xMemCachedclient . delete ( "key" ) ;
 
// let's catch all exceptions
} catch ( IOException e ) {
e . printStackTrace ( ) ;
} catch ( MemcachedException e ) {
e . printStackTrace ( ) ;
} catch ( TimeoutException e ) {
e . printStackTrace ( ) ;
} catch ( InterruptedException e ) {
e . printStackTrace ( ) ;
}
}
 
// Simple log utility
private static void log ( Object object ) {
System . out . println ( object ) ;
 
}
 
}

Assurez-vous que le serveur Memcached est opérationnel.

1
bash - 3.2 $ memcached - d - p 11211

Exécutez simplement la commande ci-dessus dans Eclipse pour voir le résultat ci-dessous.

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
===================================== Approach - 1 : Using SpyMemcahed : https : //crunchify.com/memcached-java-client-net-spy-spymemcached/ =====================================
 
===================================== Approach - 2 : Using com . whalin . Memcached - Java - Client =====================================
 
SLF4J : The requested version 1.7.16 by your slf4j binding is not compatible with [ 1.6 ]
SLF4J : See http : //www.slf4j.org/codes.html#version_mismatch for further details.
== > Total 3 Records added to MemCached using com . whalin . Memcached - Java - Client Method
 
Key : Java , Value : Crunchify . com
Key : WordPress , Value : WordPress . com
Key : Social , Value : Facebook . com
== > Total 3 Records Retrieved from MemCached using com . whalin . Memcached - Java - Client Method
 
18 : 27 : 35.433 [ main ] DEBUG com . whalin . MemCached . MemCachedClient - ++++ deletion of key : Social from cache was a success
== > Record deleted using com . whalin . Memcached - Java - Client Method
 
Key : Social , Value : null
== > Failure to get record Social as we deleted that before
 
===================================== Approach - 3 : Using com . googlecode . xmemcached Method =====================================
 
18 : 27 : 35.456 [ main ] INFO net . rubyeye . xmemcached . XMemcachedClient - XMemcachedClient is using Text protocol
18 : 27 : 35.491 [ main ] INFO com . google . code . yanf4j . nio . impl . SelectorManager - Creating 8 reactors . . .
18 : 27 : 35.496 [ main ] INFO com . google . code . yanf4j . core . impl . AbstractController - The Controller started at localhost / 127.0.0.1 : 0 . . .
18 : 27 : 35.509 [ Xmemcached - Reactor - 0 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - session started
18 : 27 : 35.510 [ Xmemcached - Reactor - 0 ] INFO com . google . code . yanf4j . core . impl . AbstractController - Add a session : 127.0.0.1 : 11211
18 : 27 : 35.513 [ main ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - After encodingset Crunchify 0 3600 8
New York
 
18 : 27 : 35.514 [ Xmemcached - Reactor - 2 ] DEBUG net . rubyeye . xmemcached . impl . Optimizer - Optimieze merge buffer : set Crunchify 0 3600 8
New York
 
18 : 27 : 35.514 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - send buffers :
[
buffer : position = 0 , limit = 34 , capacity = 34
]
18 : 27 : 35.515 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - read 8 bytes from channel
18 : 27 : 35.515 [ main ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - After encodingset Twitter 0 3600 13
San Francisco
 
18 : 27 : 35.515 [ Xmemcached - Reactor - 2 ] DEBUG net . rubyeye . xmemcached . impl . Optimizer - Optimieze merge buffer : set Twitter 0 3600 13
San Francisco
 
18 : 27 : 35.515 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - send buffers :
[
buffer : position = 0 , limit = 38 , capacity = 38
]
18 : 27 : 35.515 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - read 8 bytes from channel
18 : 27 : 35.516 [ main ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - After encodingget Twitter
 
18 : 27 : 35.517 [ Xmemcached - Reactor - 2 ] DEBUG net . rubyeye . xmemcached . impl . Optimizer - Optimieze merge buffer : get Twitter
 
18 : 27 : 35.517 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - send buffers :
[
buffer : position = 0 , limit = 13 , capacity = 13
]
18 : 27 : 35.518 [ main ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - After encodingget Twitter
 
18 : 27 : 35.518 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - read 40 bytes from channel
18 : 27 : 35.518 [ Xmemcached - Reactor - 2 ] DEBUG net . rubyeye . xmemcached . impl . Optimizer - Optimieze merge buffer : get Twitter
 
18 : 27 : 35.518 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - send buffers :
[
buffer : position = 0 , limit = 13 , capacity = 13
]
===== > Key : Twitter , Value : San Francisco
 
18 : 27 : 35.518 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - read 40 bytes from channel
18 : 27 : 35.519 [ main ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - After encodingget Crunchify
 
18 : 27 : 35.519 [ Xmemcached - Reactor - 2 ] DEBUG net . rubyeye . xmemcached . impl . Optimizer - Optimieze merge buffer : get Crunchify
 
18 : 27 : 35.519 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - send buffers :
[
buffer : position = 0 , limit = 15 , capacity = 15
]
18 : 27 : 35.519 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - read 36 bytes from channel
18 : 27 : 35.519 [ main ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - After encodingget Crunchify
 
18 : 27 : 35.519 [ Xmemcached - Reactor - 2 ] DEBUG net . rubyeye . xmemcached . impl . Optimizer - Optimieze merge buffer : get Crunchify
 
18 : 27 : 35.519 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - send buffers :
[
buffer : position = 0 , limit = 15 , capacity = 15
]
===== > Key : Crunchify , Value : New York
 
18 : 27 : 35.520 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - read 36 bytes from channel
18 : 27 : 35.520 [ main ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - After encodingtouch key 30
 
18 : 27 : 35.520 [ Xmemcached - Reactor - 2 ] DEBUG net . rubyeye . xmemcached . impl . Optimizer - Optimieze merge buffer : touch key 30
 
18 : 27 : 35.520 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - send buffers :
[
buffer : position = 0 , limit = 14 , capacity = 14
]
18 : 27 : 35.520 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - read 11 bytes from channel
18 : 27 : 35.520 [ main ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - After encodingdelete Crunchify
 
18 : 27 : 35.520 [ Xmemcached - Reactor - 2 ] DEBUG net . rubyeye . xmemcached . impl . Optimizer - Optimieze merge buffer : delete Crunchify
 
18 : 27 : 35.521 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - send buffers :
[
buffer : position = 0 , limit = 18 , capacity = 18
]
18 : 27 : 35.521 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - read 9 bytes from channel
18 : 27 : 35.521 [ main ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - After encodingget Crunchify
 
18 : 27 : 35.521 [ Xmemcached - Reactor - 2 ] DEBUG net . rubyeye . xmemcached . impl . Optimizer - Optimieze merge buffer : get Crunchify
 
18 : 27 : 35.521 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - send buffers :
[
buffer : position = 0 , limit = 15 , capacity = 15
]
===== > Key : Crunchify , Value : null
 
18 : 27 : 35.521 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - read 5 bytes from channel
18 : 27 : 35.521 [ main ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - After encodingdelete key
 
18 : 27 : 35.521 [ Xmemcached - Reactor - 2 ] DEBUG net . rubyeye . xmemcached . impl . Optimizer - Optimieze merge buffer : delete key
 
18 : 27 : 35.521 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - send buffers :
[
buffer : position = 0 , limit = 12 , capacity = 12
]
===================================== Program Completed =====================================
 
18 : 27 : 35.522 [ Xmemcached - Reactor - 2 ] DEBUG com . google . code . yanf4j . core . impl . AbstractSession - read 11 bytes from channel

Comme vous le voyez dans le résultat ci-dessus, il est facile de récupérer et d'économiser de la valeur et c'est le moyen le plus rapide d'avoir une solution de mise en cache centrale pour votre application Java de production.