romseygeek commented on a change in pull request #679:
URL: https://github.com/apache/lucene/pull/679#discussion_r806633322
##########
File path:
lucene/monitor/src/java/org/apache/lucene/monitor/MonitorConfiguration.java
##########
@@ -35,8 +34,9 @@
private long purgeFrequency = 5;
private TimeUnit purgeFrequencyUnits = TimeUnit.MINUTES;
private QueryDecomposer queryDecomposer = new QueryDecomposer();
- private Path indexPath = null;
private MonitorQuerySerializer serializer;
+ private Boolean readOnly = false;
+ private DirectoryProviderFunctionalInterface directoryProvider;
Review comment:
We can set this to a default value of `() -> new ByteBuffersDirectory()`
which would then simplify the `buildIndexWriter()` implementation.
##########
File path:
lucene/monitor/src/java/org/apache/lucene/monitor/DirectoryProviderFunctionalInterface.java
##########
@@ -0,0 +1,32 @@
+/*
+ * 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.lucene.monitor;
+
+import java.io.IOException;
+import org.apache.lucene.store.Directory;
+
+/** A functional interface to provide a Directory instance */
+public interface DirectoryProviderFunctionalInterface {
Review comment:
Can we use `org.apache.lucene.util.IOSupplier` here instead please?
##########
File path: lucene/monitor/src/java/org/apache/lucene/monitor/QueryIndex.java
##########
@@ -87,8 +81,20 @@
final Map<IndexReader.CacheKey, QueryTermFilter> termFilters = new
HashMap<>();
QueryIndex(MonitorConfiguration config, Presearcher presearcher) throws
IOException {
Review comment:
Given that QueryIndex is package-private I think we have some leeway to
split things up here a bit and make things clearer. Could you try making
QueryIndex itself an interface, and then having read-only and writeable
implementations? We could also move the purge executor from the Monitor into
the writeable QueryIndex implementation as it's not necessary to clear the
cache at all on a read-only query index.
##########
File path: lucene/monitor/src/java/org/apache/lucene/monitor/QueryIndex.java
##########
@@ -36,15 +36,7 @@
import org.apache.lucene.document.Field;
import org.apache.lucene.document.SortedDocValuesField;
import org.apache.lucene.document.StringField;
-import org.apache.lucene.index.BinaryDocValues;
Review comment:
The code formatter will complain about these imports I think
##########
File path: lucene/monitor/src/java/org/apache/lucene/monitor/QueryIndex.java
##########
@@ -87,8 +81,20 @@
final Map<IndexReader.CacheKey, QueryTermFilter> termFilters = new
HashMap<>();
QueryIndex(MonitorConfiguration config, Presearcher presearcher) throws
IOException {
Review comment:
> Keeping the readonly flag in MonitorConfiguration and instantiating
the correct on in Monitor, should be enough?
I think so. Maybe add it as a second parameter to `setDirectoryProvider` as
it only really makes sense in combination with a custom Directory?
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