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Subject [GitHub] [flink] zjffdu commented on a change in pull request #8038: [FLINK-11953] Introduce Plugin/Loading system and integrate it with FileSystem
Date Mon, 15 Apr 2019 08:18:53 GMT
zjffdu commented on a change in pull request #8038: [FLINK-11953] Introduce Plugin/Loading
system and integrate it with FileSystem
URL: https://github.com/apache/flink/pull/8038#discussion_r275249795
 
 

 ##########
 File path: flink-core/src/main/java/org/apache/flink/core/plugin/DirectoryBasedPluginFinder.java
 ##########
 @@ -0,0 +1,103 @@
+/*
+ * 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.flink.core.plugin;
+
+import org.apache.flink.util.function.FunctionUtils;
+
+import java.io.IOException;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.PathMatcher;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.stream.Collectors;
+
+/**
+ * This class is used to create a collection of {@link PluginDescriptor} based on directory
structure for a given plugin
+ * root folder.
+ *
+ * <p>The expected structure is as follows: the given plugins root folder, containing
the plugins folder. One plugin folder
+ * contains all resources (jar files) belonging to a plugin. The name of the plugin folder
becomes the plugin id.
+ * <pre>
+ * plugins-root-folder/
+ *            |------------plugin-a/ (folder of plugin a)
+ *            |                |-plugin-a-1.jar (the jars containing the classes of plugin
a)
+ *            |                |-plugin-a-2.jar
+ *            |                |-...
+ *            |
+ *            |------------plugin-b/
+ *            |                |-plugin-b-1.jar
+ *           ...               |-...
+ * </pre>
 
 Review comment:
   Thanks @pnowojski 

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