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https://issues.apache.org/jira/browse/JENA-626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14962358#comment-14962358
]
ASF GitHub Bot commented on JENA-626:
-------------------------------------
Github user ajs6f commented on a diff in the pull request:
https://github.com/apache/jena/pull/95#discussion_r42320655
--- Diff:
jena-fuseki2/jena-fuseki-core/src/main/java/org/apache/jena/fuseki/cache/CacheClient.java
---
@@ -0,0 +1,30 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.jena.fuseki.cache;
+
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeoutException;
+
+public abstract class CacheClient {
+
+ public abstract Object get(String key) throws InterruptedException,
ExecutionException, TimeoutException ;
--- End diff --
You end up constantly checking for `null` on return values of this method.
Maybe it might be better to just return `Optional` (or better, `Optional<V>` as
noted above)?
> SPARQL Query Caching
> --------------------
>
> Key: JENA-626
> URL: https://issues.apache.org/jira/browse/JENA-626
> Project: Apache Jena
> Issue Type: Improvement
> Reporter: Andy Seaborne
> Labels: java, linked_data, rdf, sparql
>
> Add a caching layer to Fuseki to cache the results of SPARQL Query requests.
> This cache should allow for in-memory and disk-based caching, configuration
> and cache management, and coordination with data modification.
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