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From GitBox <...@apache.org>
Subject [GitHub] srkukarni commented on a change in pull request #3324: Add Windowfunction interface to functions api
Date Tue, 08 Jan 2019 00:50:25 GMT
srkukarni commented on a change in pull request #3324: Add Windowfunction interface to functions
api
URL: https://github.com/apache/pulsar/pull/3324#discussion_r245847509
 
 

 ##########
 File path: pulsar-functions/api-java/src/main/java/org/apache/pulsar/functions/api/WindowFunction.java
 ##########
 @@ -0,0 +1,34 @@
+/**
+ * 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.pulsar.functions.api;
+
+import java.util.Collection;
+
+/**
+ * This is the interface of the windowed function api. The process method is called
+ * for every triggered window.
+ */
+@FunctionalInterface
+public interface WindowFunction<I, O> {
+    /**
+     * Process the input.
+     * @return the output
+     */
+    O process(Collection<I> input, WindowContext context) throws Exception;
 
 Review comment:
   In a follow up pr, I was thinking of adding something to WindowContext to get something
like getCurrentWindow(or something like that) that returns information in terms of Collection<Record>

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