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https://issues.apache.org/jira/browse/APEXMALHAR-2106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15319270#comment-15319270
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ASF GitHub Bot commented on APEXMALHAR-2106:
--------------------------------------------
Github user bhupeshchawda commented on a diff in the pull request:
https://github.com/apache/apex-malhar/pull/309#discussion_r66143201
--- Diff:
library/src/main/java/com/datatorrent/lib/stream/MultipleStreamMerger.java ---
@@ -0,0 +1,277 @@
+/**
+ * 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 com.datatorrent.lib.stream;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+
+import org.apache.hadoop.conf.Configuration;
+
+import com.datatorrent.api.DAG;
+import com.datatorrent.api.DefaultInputPort;
+import com.datatorrent.api.DefaultOutputPort;
+import com.datatorrent.api.Module;
+
+/**
+ * Module that adds functionality to bypass the platform limitations of
combining more than two streams at a time with
+ * Stream Merger.
+ *
+ * Usage:
+ *
+ * dag.addOperator("Stream_1", op1);
+ * dag.addOperator("Stream_2", op2);
+ * dag.addOperator("Stream_3", op3);
+ *
+ * MultipleStreamMerger merger = new MultipleStreamMerger();
+ * merger.merge(op1.out)
+ * .merge(op2.out)
+ * .merge(op3.out)
+ * .insertInto(dag, conf);
+ *
+ * dag.addModule("Merger", merger);
+ *
+ * @param <K>
+ */
+public class MultipleStreamMerger<K> implements Module
+{
+ public class Stream
+ {
+ DefaultInputPort destPort;
+ DefaultOutputPort sourcePort;
--- End diff --
Parametrize these ports or have it as a generic <?>
> Support merging multiple streams with StreamMerger
> ---------------------------------------------------
>
> Key: APEXMALHAR-2106
> URL: https://issues.apache.org/jira/browse/APEXMALHAR-2106
> Project: Apache Apex Malhar
> Issue Type: New Feature
> Reporter: Ilya Ganelin
> Assignee: Ilya Ganelin
>
> To properly implement the Flatten transformation (and other Stream
> combination operations), Apex must support merging data from multiple
> sources. The StreamMerger operator can be improved to merge multiple streams,
> rather than just the two streams it can handle in the present implementation.
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