Go to hazelcast.org/documentation

MultiMap Configuration

The following are the example MultiMap configurations.

Declarative:

<hazelcast>
  <multimap name="default">
    <backup-count>0</backup-count>
    <async-backup-count>1</async-backup-count>
    <value-collection-type>SET</value-collection-type>
    <entry-listeners>
        <entry-listener include-value="false" local="false">
           com.hazelcast.examples.EntryListener
        </entry-listener>
    </entry-listeners>   
  </map>
</hazelcast>

Programmatic:

MultiMapConfig mmConfig = new MultiMapConfig();
mmConfig.setName( "default" );

mmConfig.setBackupCount( "0" ).setAsyncBackupCount( "1" );

mmConfig.setValueCollectionType( "SET" );

Most of the MultiMap configuration elements and attributes have the same names and functionalities explained in the Map Configuration section. Below are the ones specific to MultiMap.

  • backup-count: Defines the number of asynchronous backups. For example, if it is set to 1, backup of a partition will be placed on 1 other member. If it is 2, it will be placed on 2 other members.
  • async-backup-count: The number of synchronous backups. Behavior is the same as that of the backup-count element.
  • statistics-enabled: You can retrieve some statistics like owned entry count, backup entry count, last update time, locked entry count by setting this parameter's value as "true". The method for retrieving the statistics is getLocalMultiMapStats().
  • value-collection-type: Type of the value collection. It can be Set or List.
  • entry-listeners: Lets you add listeners (listener classes) for the map entries. You can also set the attribute include-value to true if you want the item event to contain the entry values, and you can set local to true if you want to listen to the entries on the local node.