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.ClusterAttributeNodeFilter">
         <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.ClusterAttributeNodeFilter">
         <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.

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.