[MRM-1802] Find a cache solution for browsing part (especially root browsing)

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1583867 13f79535-47bb-0310-9956-ffa450edef68

2 files changed, 62 insertions, 14 deletions

diff --git a/archiva-modules/metadata/metadata-repository-api/src/main/java/org/apache/archiva/metadata/repository/DefaultMetadataResolver.java b/archiva-modules/metadata/metadata-repository-api/src/main/java/org/apache/archiva/metadata/repository/DefaultMetadataResolver.java
index 469b4cf46..5c921d68b 100644
--- a/archiva-modules/metadata/metadata-repository-api/src/main/java/org/apache/archiva/metadata/repository/DefaultMetadataResolver.java
+++ b/archiva-modules/metadata/metadata-repository-api/src/main/java/org/apache/archiva/metadata/repository/DefaultMetadataResolver.java
@@ -29,6 +29,7 @@ import org.apache.archiva.metadata.repository.storage.RepositoryStorage;
 import org.apache.archiva.metadata.repository.storage.RepositoryStorageMetadataInvalidException;
 import org.apache.archiva.metadata.repository.storage.RepositoryStorageMetadataNotFoundException;
 import org.apache.archiva.metadata.repository.storage.RepositoryStorageRuntimeException;
+import org.apache.archiva.redback.components.cache.Cache;
 import org.apache.archiva.repository.events.RepositoryListener;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -43,21 +44,21 @@ import java.util.List;
 /**
  * Default implementation of the metadata resolver API. At present it will handle updating the content repository
  * from new or changed information in the model and artifacts from the repository storage.
- * <p>
+ * <p/>
  * This is a singleton component to allow an alternate implementation to be provided. It is intended to be the same
  * system-wide for the whole content repository instead of on a per-managed-repository basis. Therefore, the session is
  * passed in as an argument to obtain any necessary resources, rather than the class being instantiated within the
  * session in the context of a single managed repository's resolution needs.
- * <p>
+ * <p/>
  * Note that the caller is responsible for the session, such as closing and saving (which is implied by the resolver
  * being obtained from within the session). The {@link RepositorySession#markDirty()} method is used as a hint to ensure
  * that the session knows we've made changes at close. We cannot ensure the changes will be persisted if the caller
  * chooses to revert first. This is preferable to storing the metadata immediately - a separate session would require
  * having a bi-directional link with the session factory, and saving the existing session might save other changes
  * unknowingly by the caller.
- * <p>
+ * <p/>
  */
-@Service ("metadataResolver#default")
+@Service("metadataResolver#default")
 public class DefaultMetadataResolver
     implements MetadataResolver
 {
@@ -67,20 +68,24 @@ public class DefaultMetadataResolver
     /**
      * FIXME: this needs to be configurable based on storage type - and could also be instantiated per repo. Change to a
      * factory, and perhaps retrieve from the session. We should avoid creating one per request, however.
-     * <p>
+     * <p/>
      * TODO: Also need to accommodate availability of proxy module
      * ... could be a different type since we need methods to modify the storage metadata, which would also allow more
      * appropriate methods to pass in the already determined repository configuration, for example, instead of the ID
      */
     @Inject
-    @Named (value = "repositoryStorage#maven2")
+    @Named(value = "repositoryStorage#maven2")
     private RepositoryStorage repositoryStorage;
 
+    @Inject
+    private List<RepositoryListener> listeners;
+
     /**
-     *
+     * Cache used for namespaces
      */
     @Inject
-    private List<RepositoryListener> listeners;
+    @Named( value = "cache#namespaces" )
+    private Cache<String, Collection<String>> namespacesCache;
 
     public ProjectVersionMetadata resolveProjectVersion( RepositorySession session, String repoId, String namespace,
                                                          String projectId, String projectVersion )
@@ -176,8 +181,15 @@ public class DefaultMetadataResolver
     {
         try
         {
+
+            Collection<String> namespaces = namespacesCache.get( repoId );
+            if ( namespaces != null )
+            {
+                return namespaces;
+            }
+
             MetadataRepository metadataRepository = session.getRepository();
-            Collection<String> namespaces = metadataRepository.getRootNamespaces( repoId );
+            namespaces = metadataRepository.getRootNamespaces( repoId );
             Collection<String> storageNamespaces =
                 repositoryStorage.listRootNamespaces( repoId, new ExcludesFilter<String>( namespaces ) );
             if ( storageNamespaces != null && !storageNamespaces.isEmpty() )
@@ -190,6 +202,9 @@ public class DefaultMetadataResolver
                     try
                     {
                         metadataRepository.updateNamespace( repoId, n );
+                        // just invalidate cache entry
+                        String cacheKey = repoId + "-" + n;
+                        namespacesCache.remove( cacheKey );
                     }
                     catch ( MetadataRepositoryException e )
                     {
@@ -201,6 +216,9 @@ public class DefaultMetadataResolver
                 namespaces = new ArrayList<String>( namespaces );
                 namespaces.addAll( storageNamespaces );
             }
+
+            namespacesCache.put( repoId, namespaces );
+
             return namespaces;
         }
         catch ( RepositoryStorageRuntimeException e )
@@ -215,7 +233,13 @@ public class DefaultMetadataResolver
         try
         {
             MetadataRepository metadataRepository = session.getRepository();
-            Collection<String> namespaces = metadataRepository.getNamespaces( repoId, namespace );
+            String cacheKey = repoId + "-" + namespace;
+            Collection<String> namespaces = namespacesCache.get( cacheKey );
+            if ( namespaces == null )
+            {
+                namespaces = metadataRepository.getNamespaces( repoId, namespace );
+                namespacesCache.put( cacheKey, namespaces );
+            }
             Collection<String> exclusions = new ArrayList<String>( namespaces );
             exclusions.addAll( metadataRepository.getProjects( repoId, namespace ) );
             Collection<String> storageNamespaces =
@@ -230,6 +254,9 @@ public class DefaultMetadataResolver
                     try
                     {
                         metadataRepository.updateNamespace( repoId, namespace + "." + n );
+                        // just invalidate cache entry
+                        cacheKey = repoId + "-" + namespace + "." + n;
+                        namespacesCache.remove( cacheKey );
                     }
                     catch ( MetadataRepositoryException e )
                     {
@@ -257,7 +284,17 @@ public class DefaultMetadataResolver
             MetadataRepository metadataRepository = session.getRepository();
             Collection<String> projects = metadataRepository.getProjects( repoId, namespace );
             Collection<String> exclusions = new ArrayList<String>( projects );
-            exclusions.addAll( metadataRepository.getNamespaces( repoId, namespace ) );
+
+            String cacheKey = repoId + "-" + namespace;
+            Collection<String> namespaces = namespacesCache.get( cacheKey );
+            if ( namespaces == null )
+            {
+                namespaces = metadataRepository.getNamespaces( repoId, namespace );
+                namespacesCache.put( cacheKey, namespaces );
+            }
+
+            exclusions.addAll( namespaces );
+
             Collection<String> storageProjects =
                 repositoryStorage.listProjects( repoId, namespace, new ExcludesFilter<String>( exclusions ) );
             if ( storageProjects != null && !storageProjects.isEmpty() )
@@ -333,7 +370,7 @@ public class DefaultMetadataResolver
                     {
                         log.warn(
                             "Not update project in metadata repository due to an error resolving it from storage: {}",
-                                 e.getMessage() );
+                            e.getMessage() );
 
                         for ( RepositoryListener listener : listeners )
                         {
@@ -373,8 +410,8 @@ public class DefaultMetadataResolver
             ExcludesFilter<String> filter = new ExcludesFilter<String>( createArtifactIdList( artifacts ) );
 
             ReadMetadataRequest readMetadataRequest =
-                new ReadMetadataRequest().repositoryId( repoId ).namespace( namespace ).projectId( projectId ).projectVersion(
-                    projectVersion ).filter( filter );
+                new ReadMetadataRequest().repositoryId( repoId ).namespace( namespace ).projectId(
+                    projectId ).projectVersion( projectVersion ).filter( filter );
 
             Collection<ArtifactMetadata> storageArtifacts =
                 repositoryStorage.readArtifactsMetadata( readMetadataRequest );
diff --git a/archiva-modules/metadata/metadata-repository-api/src/main/resources/META-INF/spring-context.xml b/archiva-modules/metadata/metadata-repository-api/src/main/resources/META-INF/spring-context.xml
index e7c511811..34e5c3d5d 100644
--- a/archiva-modules/metadata/metadata-repository-api/src/main/resources/META-INF/spring-context.xml
+++ b/archiva-modules/metadata/metadata-repository-api/src/main/resources/META-INF/spring-context.xml
@@ -39,4 +39,15 @@
     </constructor-arg>
   </bean>
 
+  <bean name="cache#namespaces" class="org.apache.archiva.redback.components.cache.ehcache.EhcacheCache"
+        init-method="initialize">
+    <property name="diskPersistent" value="false"/>
+    <property name="eternal" value="false"/>
+    <property name="maxElementsInMemory" value="1000"/>
+    <property name="memoryEvictionPolicy" value="LRU"/>
+    <property name="name" value="usersCache"/>
+    <property name="timeToIdleSeconds" value="600"/>
+    <property name="timeToLiveSeconds" value="600"/>
+  </bean>
+
 </beans>
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