Github user vkorukanti commented on a diff in the pull request:
https://github.com/apache/drill/pull/476#discussion_r60631846
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/dfs/FileSystemPluginImplementationProvider.java
---
@@ -0,0 +1,141 @@
+/**
+ * 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
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * 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.drill.exec.store.dfs;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Lists;
+import org.apache.drill.common.exceptions.ExecutionSetupException;
+import org.apache.drill.exec.server.DrillbitContext;
+import org.apache.drill.exec.store.ClassPathFileSystem;
+import org.apache.drill.exec.store.LocalSyncableFileSystem;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+
+import static
org.apache.drill.exec.store.dfs.FileSystemSchemaFactory.DEFAULT_WS_NAME;
+
+/**
+ * Provides needed component by the {@link FileSystemPlugin}. This can be
overridden to supply customized components
+ * (such as custom schema factory) to {@link FileSystemPlugin}.
+ */
+public class FileSystemPluginImplementationProvider {
+
+ protected final FileSystemConfig fsConfig;
+ protected final String fsPluginName;
+ protected final DrillbitContext dContext;
+
+ private FormatCreator formatCreator; /** Don't use this directly, use
{@link #getFormatCreator(Configuration)} */
+
+ /**
+ * Instantiate an object
+ * @param dContext {@link DrillbitContext} instance.
+ * @param fsPluginName Name of the FileSystemPlugin storage
+ * @param fsConfig FileSystemPlugin configuration
+ */
+ public FileSystemPluginImplementationProvider(
+ final DrillbitContext dContext,
+ final String fsPluginName,
+ final FileSystemConfig fsConfig) {
+ this.dContext = dContext;
+ this.fsConfig = fsConfig;
+ this.fsPluginName = fsPluginName;
+ }
+
+ /**
+ * @return Return any properties needed for {@link Configuration} object
that are not set in
+ * {@link FileSystemPlugin}'s configuration.
+ */
+ public Map<String, String> getFsProps() {
+ return ImmutableMap.of(
+ "fs.classpath.impl", ClassPathFileSystem.class.getName(),
+ "fs.drill-local.impl", LocalSyncableFileSystem.class.getName()
+ );
+ }
+
+ /**
+ * @return Create and return {@link FormatCreator} based on the storage
plugin configuration.
+ */
+ public FormatCreator getFormatCreator(final Configuration fsConf) {
+ if (formatCreator == null) {
--- End diff --
It was an optimization made based on the assumption, Configuration is not
going to change within FileSystemPlugin. Changed few APIs so that we pass the
FormatCreator directly instead of calling getFormatCreator() multiple times.
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