Hibernate-memcached-use memcached as a level-2 distributed cache in hibernate

Today, I saw a memcached on the Internet as the hibernate level-2 distributed cache. I felt very interested. I tried it and it felt pretty good. I recommend it to you.

Http://code.google.com/p/hibernate-memcached/

The latest version is 1.0, supporting hibernate3.3.

The following describes how to use it:
Hibernate-memcached must support the following class libraries:

• Hibernate-memcached-<version>. Jar
• Memcached-2.1.jar
• Spy-2.4.jar
• Commons-codec 1.3
• Slf4j-1.5.0.jar if your project uses log4j, you can use
  Slf4j-log4j12-1.5.0.jar

The configuration method is as follows:

Configure hibernate to use cache to provide classes

Hibernate. cache. provider_class

Com. googlecode. hibernate. memcached. memcachedcacheprovider

 

Enable query Cache

Hibernate. cache. use_query_cache

True

Other parameter settings:

Property	Default	Description
Hibernate. memcached. Servers	Localhost: 11211	Memcached service address, separated by Spaces Format: Host: Port
Hibernate. memcached. cachetimeseconds	300	Cache expiration time, in seconds
Hibernate. memcached. keystrategy	Hashcodekeystrategy	Cache key generation and storage hashcode Algorithm
Hibernate. memcached. readbuffersize	Defaultconnectionfactory. default_read_buffer_size	Size of the data cache zone read from the server
Hibernate. memcached. operationqueuelength	Defaultconnectionfactory. default_op_queue_len	Maximum length of the Operation queue returned by this connection Factory
Hibernate. memcached. operationtimeout	Defaultconnectionfactory. default_operation_timeout	Operation timeout settings
Hibernate. memcached. hashalgorithm	Hashalgorithm. ketama_hash	The Hash hash algorithm used to cache data to the server is added. When When setting hibernate-memcached to the ketama_hash algorithm, note: the Default Client API uses hashalgorithm. native_hash.
Hibernate. memcached. clearsupported	False	Supports the memcachedcache. Clear () method to clear the cache. Do not enable this function.

Configuration example (this document uses hibernate3.3-entitymanager as an example)
Configure the persistence. xml file

<?
XML version = "1.0" encoding = "UTF-8"
?>


<
Persistence
Xmlns
= "Http://java.sun.com/xml/ns/persistence"
"Target
= "_ New"
>
Http://java.sun.com/xml/ns/persistence "xmlns: xsi =" http://www.w3.org/2001/XMLSchema-instance "xsi: schemalocation =" http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd "version =" 1.0 ">

<
Persistence-Unit
Name
= "Entitymanager"
Transaction-type
= "Resource_local"
>


<
Provider
>
Org. hibernate. EJB. hibernatepersistence
</
Provider
>


<
JTA-data-Source
>
Java: COMP/ENV/jdbc/qualitydb
</
JTA-data-Source
>

<
Properties
>


<
Property
Name
= "Hibernate. dialect"
Value
= "Org. hibernate. dialect. postgresqldialect"
 
/>


<
Property
Name
= "Hibernate. max_fetch_depth"
Value
= "3"
 
/>


<
Property
Name
= "Hibernate. show_ SQL"
Value
= "True"
 
/>

<
Property
Name
= "Hibernate. cache. region_prefix"
Value
= "Quality. cache. ehcache"
/>


<
Property
Name
= "Hibernate. cache. use_second_level_cache"
Value
= "True"
/>


<
Property
Name
= "Hibernate. cache. use_structured_entries"
Value
= "True"
/>


<
Property
Name
= "Hibernate. cache. use_query_cache"
Value
= "True"
/>


<
Property
Name
= "Hibernate. cache. provider_class"
Value
= "Com. googlecode. hibernate. memcached. memcachedcacheprovider"
/>


<
Property
Name
= "Hibernate. memcached. servers"
Value
= "Localhost: 11211"
/>

</
Properties
>

</
Persistence-Unit
>

</
Persistence
>

The following prompt is displayed after startup:
17:10:08, 312 jclloggeradapter. java265 info -- Starting memcachedclient...
2008-08-28
17:10:08. 718 Info net. Spy. memcached. memcachedconnection: added {QA
Sa = localhost/127.0.0.1: 11211, # ROPS = 0, # wops = 0, # IQ = 0, toprop = NULL,
Topwop = NULL, towrite = 0, interested = 0} to connect queue
2008-08-28
17:10:08. 750 Info net. Spy. memcached. memcachedconnection: Connection
State changed for sun. NiO. Ch. selectionkeyimpl @ 16e59da

Indicates that the first step has been configured successfully. Next, configure the entity to be cached.

1
@ Entity

2
@ Cache (usage
=
Cacheconcurrencystrategy. read_write)
//
Set Request Cache


3
Public
 
Class
Student {

4
 

5
@ ID

6
@ Column (Length
=
32
)

7

Private
String ID;

8


9
@ Column (Length
=
20
)

10

Private
String name;

11


12
@ Onetoworkflow

13
@ Cache (usage
=
Cacheconcurrencystrategy. read_write)

14

Private
Set
<
Book
>
Books;

15
 

16
}

OK. Now the configuration is complete.

Good luck!
Yours Matthew!