org.opennms.netmgt.newts.support

Class GuavaSearchableResourceMetadataCache

java.lang.Object

org.opennms.netmgt.newts.support.GuavaSearchableResourceMetadataCache

All Implemented Interfaces:

com.google.common.cache.RemovalListener<String,org.opennms.newts.cassandra.search.ResourceMetadata>, SearchableResourceMetadataCache, org.opennms.newts.cassandra.search.ResourceMetadataCache

public class GuavaSearchableResourceMetadataCache
extends Object
implements SearchableResourceMetadataCache, com.google.common.cache.RemovalListener<String,org.opennms.newts.cassandra.search.ResourceMetadata>

A copy of GuavaResourceMetadataCache with support for searching resources within the cache. Cached entries are maintained two structures, a Guava Cache and a Radix Tree. The main caching functionality is provided by the Guava Cache and the Radix Tree is used for searching by prefix. The additional memory usage should be minimal since we only need to duplicate the keys, the nodes references the same objects. Both structures are kept in synch via a RemovalListener.

Author:

jwhite

Constructor Summary

Constructors

Constructor and Description
GuavaSearchableResourceMetadataCache(long maxSize, com.codahale.metrics.MetricRegistry registry)

Method Summary

Modifier and Type	Method and Description
void	delete(org.opennms.newts.api.Context context, org.opennms.newts.api.Resource resource)
com.google.common.base.Optional<org.opennms.newts.cassandra.search.ResourceMetadata>	get(org.opennms.newts.api.Context context, org.opennms.newts.api.Resource resource)
List<String>	getResourceIdsWithPrefix(org.opennms.newts.api.Context context, String resourceIdPrefix)
void	merge(org.opennms.newts.api.Context context, org.opennms.newts.api.Resource resource, org.opennms.newts.cassandra.search.ResourceMetadata metadata)
void	onRemoval(com.google.common.cache.RemovalNotification<String,org.opennms.newts.cassandra.search.ResourceMetadata> notification)

Methods inherited from class java.lang.Object

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

Constructor Detail

GuavaSearchableResourceMetadataCache

@Inject
public GuavaSearchableResourceMetadataCache(@Named(value="search.resourceMetadata.maxCacheEntries")
                                                    long maxSize,
                                                    com.codahale.metrics.MetricRegistry registry)

Method Detail

get

public com.google.common.base.Optional<org.opennms.newts.cassandra.search.ResourceMetadata> get(org.opennms.newts.api.Context context,
                                                                                                org.opennms.newts.api.Resource resource)

Specified by:

get in interface org.opennms.newts.cassandra.search.ResourceMetadataCache

delete

public void delete(org.opennms.newts.api.Context context,
                   org.opennms.newts.api.Resource resource)

Specified by:

delete in interface org.opennms.newts.cassandra.search.ResourceMetadataCache

merge

public void merge(org.opennms.newts.api.Context context,
                  org.opennms.newts.api.Resource resource,
                  org.opennms.newts.cassandra.search.ResourceMetadata metadata)

Specified by:

merge in interface org.opennms.newts.cassandra.search.ResourceMetadataCache

getResourceIdsWithPrefix

public List<String> getResourceIdsWithPrefix(org.opennms.newts.api.Context context,
                                             String resourceIdPrefix)

Specified by:

getResourceIdsWithPrefix in interface SearchableResourceMetadataCache

onRemoval

public void onRemoval(com.google.common.cache.RemovalNotification<String,org.opennms.newts.cassandra.search.ResourceMetadata> notification)

Specified by:

onRemoval in interface com.google.common.cache.RemovalListener<String,org.opennms.newts.cassandra.search.ResourceMetadata>