org.apache.ignite.util

Class AttributeNodeFilter

java.lang.Object

org.apache.ignite.util.AttributeNodeFilter

All Implemented Interfaces:

Serializable, IgnitePredicate<ClusterNode>

public class AttributeNodeFilter
extends Object
implements IgnitePredicate<ClusterNode>

Implementation of IgnitePredicate<ClusterNode> based on user attributes. This filter can be used in methods like ClusterGroup.forPredicate(IgnitePredicate), CacheConfiguration.setNodeFilter(IgnitePredicate), ServiceConfiguration.setNodeFilter(IgnitePredicate), etc.

The filter will evaluate to true if a node has all provided attributes set to corresponding values. Here is an example of how you can configure node filter for a cache or a service so that it's deployed only on nodes that have group attribute set to value data:

 <property name="nodeFilter">
     <bean class="org.apache.ignite.util.AttributeNodeFilter">
         <constructor-arg value="group"/>
         <constructor-arg value="data"/>
     </bean>
 </property>
 

You can also specify multiple attributes for the filter:

 <property name="nodeFilter">
     <bean class="org.apache.ignite.util.AttributeNodeFilter">
         <constructor-arg>
             <map>
                 <entry key="cpu-group" value="high"/>
                 <entry key="memory-group" value="high"/>
             </map>
         </constructor-arg>
     </bean>
 </property>
 

With this configuration a cache or a service will deploy only on nodes that have both cpu-group and memory-group attributes set to value high.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
AttributeNodeFilter(Map<String,Object> attrs) Creates new node filter with a set of attributes.
AttributeNodeFilter(String attrName, @Nullable Object attrVal) Creates new node filter with a single attribute value.

Method Summary

Modifier and Type	Method and Description
boolean	apply(ClusterNode node) Predicate body.
Map<String,Object>	getAttrs() Gets attributes.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AttributeNodeFilter

public AttributeNodeFilter(String attrName,
                           @Nullable
                           @Nullable Object attrVal)

Creates new node filter with a single attribute value.

Parameters:

attrName - Attribute name.

attrVal - Attribute value.

AttributeNodeFilter

public AttributeNodeFilter(Map<String,Object> attrs)

Creates new node filter with a set of attributes.

Parameters:

attrs - Attributes.

Method Detail

apply

public boolean apply(ClusterNode node)

Predicate body.

Specified by:

apply in interface IgnitePredicate<ClusterNode>

Parameters:

node - Predicate parameter.

Returns:

Return value.

getAttrs

public Map<String,Object> getAttrs()

Gets attributes.

Returns:

Attributes collection.