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https://issues.apache.org/jira/browse/DRILL-4275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15147910#comment-15147910
]
ASF GitHub Bot commented on DRILL-4275:
---------------------------------------
Github user hnfgns commented on a diff in the pull request:
https://github.com/apache/drill/pull/374#discussion_r52954240
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/sys/PersistentStoreProvider.java
---
@@ -17,17 +17,26 @@
*/
package org.apache.drill.exec.store.sys;
-import java.util.Map;
-
+import org.apache.drill.exec.exception.StoreException;
/**
- * Interface for reading and writing values to a persistent storage
provider. Iterators are guaranteed to be returned in key order.
- * @param <V>
+ * A factory used to create {@link PersistentStore store} instances.
+ *
*/
-public interface PStore<V> extends Iterable<Map.Entry<String, V>> {
- public V get(String key);
- public void put(String key, V value);
- public boolean putIfAbsent(String key, V value);
- public void delete(String key);
- public void close();
+public interface PersistentStoreProvider extends AutoCloseable {
+ /**
+ * Gets or creates a {@link PersistentStore persistent store} for the
given configuration.
+ *
+ * Note that implementors have liberty to cache previous {@link
PersistentStore store} instances.
+ *
+ * @param config store configuration
+ * @param <V> store value type
+ */
+ <V> PersistentStore<V> getStore(PersistentStoreConfig<V> config) throws
StoreException;
--- End diff --
done.
> Refactor e/pstore interfaces and their factories to provide a unified
> mechanism to access stores
> ------------------------------------------------------------------------------------------------
>
> Key: DRILL-4275
> URL: https://issues.apache.org/jira/browse/DRILL-4275
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Flow
> Reporter: Hanifi Gunes
> Assignee: Deneche A. Hakim
>
> We rely on E/PStore interfaces to persist data. Even though E/PStore stands
> for Ephemeral and Persistent stores respectively, the current design for
> EStore does not extend the interface/functionality of PStore at all, which
> hints abstraction for EStore is redundant. This issue proposes a new unified
> Store interface replacing the old E/PStore that exposes an additional method
> that report persistence level as follows:
> {code:title=Store interface}
> interface Store<V> {
> StoreMode getMode();
> V get(String key);
> ...
> }
> enum StoreMode {
> EPHEMERAL,
> PERSISTENT,
> ...
> }
> {code}
> The new design brings in less redundancy, more centralized code, ease to
> reason and maintain.
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