{"action":"created","comment":{"url":"https://api.github.com/repos/confluentinc/kafka/pulls/comments/37917385","id":37917385,"diff_hunk":"@@ -0,0 +1,104 @@\n+/**\n+ * Licensed to the Apache Software Foundation (ASF) under one or more\n+ * contributor license agreements.  See the NOTICE file distributed with\n+ * this work for additional information regarding copyright ownership.\n+ * The ASF licenses this file to You under the Apache License, Version 2.0\n+ * (the \"License\"); you may not use this file except in compliance with\n+ * the License.  You may obtain a copy of the License at\n+ *\n+ *    http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing, software\n+ * distributed under the License is distributed on an \"AS IS\" BASIS,\n+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n+ * See the License for the specific language governing permissions and\n+ * limitations under the License.\n+ */\n+\n+package org.apache.kafka.streaming.processor.internals;\n+\n+import org.apache.kafka.streaming.processor.ProcessorContext;\n+\n+import java.util.HashMap;\n+import java.util.List;\n+import java.util.Map;\n+import java.util.Set;\n+\n+public class ProcessorTopology {\n+\n+    private Map<String, ProcessorNode> processors = new HashMap<>();\n+    private Map<String, SourceNode> sourceTopics = new HashMap<>();\n+    private Map<String, SinkNode> sinkTopics = new HashMap<>();\n+\n+    public ProcessorTopology(Map<String, ProcessorNode> processors,\n+                             Map<String, SourceNode> sourceTopics,\n+                             Map<String, SinkNode> sinkTopics) {\n+        this.processors = processors;\n+        this.sourceTopics = sourceTopics;\n+        this.sinkTopics = sinkTopics;\n+    }\n+\n+    public Set<String> sourceTopics() {\n+        return sourceTopics.keySet();\n+    }\n+\n+    public Set<String> sinkTopics() {\n+        return sinkTopics.keySet();\n+    }\n+\n+    public SourceNode source(String topic) {\n+        return sourceTopics.get(topic);\n+    }\n+\n+    public SinkNode sink(String topic) {\n+        return sinkTopics.get(topic);\n+    }\n+\n+    /**\n+     * Initialize the processors following the DAG reverse ordering\n+     * such that parents are always initialized before children\n+     */\n+    @SuppressWarnings(\"unchecked\")\n+    public void init(ProcessorContext context) {\n+        // initialize sources\n+        for (String topic : sourceTopics.keySet()) {\n+            SourceNode source = sourceTopics.get(topic);\n+\n+            init(source, context);\n+        }\n+    }\n+\n+    /**\n+     * Initialize the current processor node by first initializing\n+     * its parent nodes first, then the processor itself","path":"stream/src/main/java/org/apache/kafka/streaming/processor/internals/ProcessorTopology.java","position":73,"original_position":73,"commit_id":"13335022ae05f7e128728804d92a18ba1adfcce9","original_commit_id":"13335022ae05f7e128728804d92a18ba1adfcce9","user":{"login":"guozhangwang","id":10729597,"avatar_url":"https://avatars.githubusercontent.com/u/10729597?v=3","gravatar_id":"","url":"https://api.github.com/users/guozhangwang","html_url":"https://github.com/guozhangwang","followers_url":"https://api.github.com/users/guozhangwang/followers","following_url":"https://api.github.com/users/guozhangwang/following{/other_user}","gists_url":"https://api.github.com/users/guozhangwang/gists{/gist_id}","starred_url":"https://api.github.com/users/guozhangwang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/guozhangwang/subscriptions","organizations_url":"https://api.github.com/users/guozhangwang/orgs","repos_url":"https://api.github.com/users/guozhangwang/repos","events_url":"https://api.github.com/users/guozhangwang/events{/privacy}","received_events_url":"https://api.github.com/users/guozhangwang/received_events","type":"User","site_admin":false},"body":"I was thinking for some cases like joins, we want to check the joinability / etc upon initialization.","created_at":"2015-08-25T20:47:51Z","updated_at":"2015-08-25T20:47:51Z","html_url":"https://github.com/confluentinc/kafka/pull/6#discussion_r37917385","pull_request_url":"https://api.github.com/repos/confluentinc/kafka/pulls/6","_links":{"self":{"href":"https://api.github.com/repos/confluentinc/kafka/pulls/comments/37917385"},"html":{"href":"https://github.com/confluentinc/kafka/pull/6#discussion_r37917385"},"pull_request":{"href":"https://api.github.com/repos/confluentinc/kafka/pulls/6"}}},"pull_request":{"url":"https://api.github.com/repos/confluentinc/kafka/pulls/6","id":42412697,"html_url":"https://github.com/confluentinc/kafka/pull/6","diff_url":"https://github.com/confluentinc/kafka/pull/6.diff","patch_url":"https://github.com/confluentinc/kafka/pull/6.patch","issue_url":"https://api.github.com/repos/confluentinc/kafka/issues/6","number":6,"state":"closed","locked":false,"title":"[WIP] New API","user":{"login":"guozhangwang","id":10729597,"avatar_url":"https://avatars.githubusercontent.com/u/10729597?v=3","gravatar_id":"","url":"https://api.github.com/users/guozhangwang","html_url":"https://github.com/guozhangwang","followers_url":"https://api.github.com/users/guozhangwang/followers","following_url":"https://api.github.com/users/guozhangwang/following{/other_user}","gists_url":"https://api.github.com/users/guozhangwang/gists{/gist_id}","starred_url":"https://api.github.com/users/guozhangwang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/guozhangwang/subscriptions","organizations_url":"https://api.github.com/users/guozhangwang/orgs","repos_url":"https://api.github.com/users/guozhangwang/repos","events_url":"https://api.github.com/users/guozhangwang/events{/privacy}","received_events_url":"https://api.github.com/users/guozhangwang/received_events","type":"User","site_admin":false},"body":"@ymatsuda @nehanarkhede @jkreps ","created_at":"2015-08-13T23:58:08Z","updated_at":"2015-08-25T20:47:51Z","closed_at":"2015-08-21T04:50:44Z","merged_at":"2015-08-21T04:50:44Z","merge_commit_sha":"3d81de43caa698686521eb120e31364795cc1f27","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/confluentinc/kafka/pulls/6/commits","review_comments_url":"https://api.github.com/repos/confluentinc/kafka/pulls/6/comments","review_comment_url":"https://api.github.com/repos/confluentinc/kafka/pulls/comments{/number}","comments_url":"https://api.github.com/repos/confluentinc/kafka/issues/6/comments","statuses_url":"https://api.github.com/repos/confluentinc/kafka/statuses/13335022ae05f7e128728804d92a18ba1adfcce9","head":{"label":"guozhangwang:NewAPI","ref":"NewAPI","sha":"13335022ae05f7e128728804d92a18ba1adfcce9","user":{"login":"guozhangwang","id":10729597,"avatar_url":"https://avatars.githubusercontent.com/u/10729597?v=3","gravatar_id":"","url":"https://api.github.com/users/guozhangwang","html_url":"https://github.com/guozhangwang","followers_url":"https://api.github.com/users/guozhangwang/followers","following_url":"https://api.github.com/users/guozhangwang/following{/other_user}","gists_url":"https://api.github.com/users/guozhangwang/gists{/gist_id}","starred_url":"https://api.github.com/users/guozhangwang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/guozhangwang/subscriptions","organizations_url":"https://api.github.com/users/guozhangwang/orgs","repos_url":"https://api.github.com/users/guozhangwang/repos","events_url":"https://api.github.com/users/guozhangwang/events{/privacy}","received_events_url":"https://api.github.com/users/guozhangwang/received_events","type":"User","site_admin":false},"repo":{"id":39164613,"name":"kafka","full_name":"guozhangwang/kafka","owner":{"login":"guozhangwang","id":10729597,"avatar_url":"https://avatars.githubusercontent.com/u/10729597?v=3","gravatar_id":"","url":"https://api.github.com/users/guozhangwang","html_url":"https://github.com/guozhangwang","followers_url":"https://api.github.com/users/guozhangwang/followers","following_url":"https://api.github.com/users/guozhangwang/following{/other_user}","gists_url":"https://api.github.com/users/guozhangwang/gists{/gist_id}","starred_url":"https://api.github.com/users/guozhangwang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/guozhangwang/subscriptions","organizations_url":"https://api.github.com/users/guozhangwang/orgs","repos_url":"https://api.github.com/users/guozhangwang/repos","events_url":"https://api.github.com/users/guozhangwang/events{/privacy}","received_events_url":"https://api.github.com/users/guozhangwang/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/guozhangwang/kafka","description":"Mirror 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