{"action":"created","comment":{"url":"https://api.github.com/repos/apache/incubator-apex-malhar/pulls/comments/45945558","id":45945558,"diff_hunk":"@@ -0,0 +1,343 @@\n+/**\n+ * Licensed to the Apache Software Foundation (ASF) under one\n+ * or more contributor license agreements.  See the NOTICE file\n+ * distributed with this work for additional information\n+ * regarding copyright ownership.  The ASF licenses this file\n+ * to you under the Apache License, Version 2.0 (the\n+ * \"License\"); you may not use this file except in compliance\n+ * with 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,\n+ * software distributed under the License is distributed on an\n+ * \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\n+ * KIND, either express or implied.  See the License for the\n+ * specific language governing permissions and limitations\n+ * under the License.\n+ */\n+package com.datatorrent.lib.join;\n+\n+import java.lang.reflect.Array;\n+import java.util.ArrayList;\n+import java.util.Calendar;\n+import java.util.List;\n+\n+import org.apache.hadoop.classification.InterfaceStability.Evolving;\n+\n+import com.datatorrent.api.Context;\n+import com.datatorrent.api.DefaultInputPort;\n+import com.datatorrent.api.DefaultOutputPort;\n+import com.datatorrent.api.Operator;\n+import com.datatorrent.api.annotation.InputPortFieldAnnotation;\n+import com.datatorrent.common.util.BaseOperator;\n+\n+/**\n+ * <p>\n+ * This is the base implementation of join operator. Operator receives tuples from multiple streams,\n+ * applies the join operation based on constraint and emit the joined value.\n+ * Subclasses should provide implementation to createOutputTuple,copyValue, getKeyValue, getTime methods.\n+ *\n+ * <b>Properties:</b><br>\n+ * <b>expiryTime</b>: Expiry time for stored tuples<br>\n+ * <b>includeFieldStr</b>: List of comma separated fields to be added to the output tuple.\n+ *                         Ex: Field1,Field2;Field3,Field4<br>\n+ * <b>keyFields</b>: List of comma separated key field for both the streams. Ex: Field1,Field2<br>\n+ * <b>timeFields</b>: List of comma separated time field for both the streams. Ex: Field1,Field2<br>\n+ * <b>bucketSpanInMillis</b>: Span of each bucket in milliseconds.<br>\n+ * <b>strategy</b>: Type of join operation. Default type is inner join<br>\n+ * <br>\n+ * </p>\n+ *\n+ * @displayName Abstract Join Operator\n+ * @tags join\n+ */\n+@Evolving\n+public abstract class AbstractJoinOperator<T> extends BaseOperator implements Operator.CheckpointListener\n+{\n+  public final transient DefaultOutputPort<List<T>> outputPort = new DefaultOutputPort<>();\n+  protected String[] timeFields;\n+\n+  protected String[][] includeFields;\n+  // Fields to compare from both the streams\n+  protected String[] keys;\n+  // Strategy of Join operation, by default the option is inner join\n+  protected JoinStrategy strategy = JoinStrategy.INNER_JOIN;\n+  // This represents whether the processing tuple is from left port or not\n+  protected Boolean isLeft;\n+  @InputPortFieldAnnotation(optional = true)\n+  public transient DefaultInputPort<T> input1 = new DefaultInputPort<T>()\n+  {\n+    @Override\n+    public void process(T tuple)\n+    {\n+      isLeft = true;\n+      processTuple(tuple);\n+    }\n+  };\n+  @InputPortFieldAnnotation(optional = true)\n+  public transient DefaultInputPort<T> input2 = new DefaultInputPort<T>()\n+  {\n+    @Override\n+    public void process(T tuple)\n+    {\n+      isLeft = false;\n+      processTuple(tuple);\n+    }\n+  };\n+  // Stores for each of the input port\n+  private BackupStore[] store = (BackupStore[])Array.newInstance(BackupStore.class, 2);\n+  private String includeFieldStr;\n+  private String keyFieldStr;\n+  private String timeFieldStr;\n+\n+  @Override\n+  public void setup(Context.OperatorContext context)\n+  {\n+    if (store[0] == null) {\n+      throw new RuntimeException(\"Left Store is Empty\");\n+    }\n+    if (store[1] == null) {\n+      throw new RuntimeException(\"Right Store is Empty\");\n+    }\n+    // Checks whether the strategy is outer join and set it to store\n+    boolean isOuter = strategy.equals(JoinStrategy.LEFT_OUTER_JOIN) || strategy.equals(JoinStrategy.OUTER_JOIN);\n+    store[0].isOuterJoin(isOuter);\n+    isOuter = strategy.equals(JoinStrategy.RIGHT_OUTER_JOIN) || strategy.equals(JoinStrategy.OUTER_JOIN);\n+    store[1].isOuterJoin(isOuter);\n+    // Setup the stores\n+    store[0].setup();\n+    store[1].setup();\n+\n+    populateFields();\n+  }\n+\n+  /**\n+   * Create the event with the given tuple. If it successfully inserted it into the store\n+   * then it does the join operation\n+   *\n+   * @param tuple Tuple to process\n+   */\n+  protected void processTuple(T tuple)\n+  {\n+    int idx = 0;\n+    if (!isLeft) {\n+      idx = 1;\n+    }\n+    TimeEvent t = createEvent(tuple);\n+    if (store[idx].put(t)) {\n+      join(t, isLeft);\n+    }\n+  }\n+\n+  private void populateFields()\n+  {\n+    populateIncludeFields();\n+    populateKeyFields();\n+    if (timeFieldStr != null) {\n+      populateTimeFields();\n+    }\n+  }\n+\n+  /**\n+   * Populate the fields from the includeFiledStr\n+   */\n+  private void populateIncludeFields()\n+  {\n+    includeFields = new String[2][];\n+    String[] portFields = includeFieldStr.split(\";\");\n+    for (int i = 0; i < portFields.length; i++) {\n+      includeFields[i] = portFields[i].split(\",\");\n+    }\n+  }\n+\n+  /**\n+   * Get the tuples from another store based on join constraint and key\n+   *\n+   * @param tuple  input\n+   * @param isLeft whether the given tuple is from first port or not\n+   */\n+  private void join(TimeEvent tuple, Boolean isLeft)\n+  {\n+    // Get the valid tuples from the store based on key\n+    // If the tuple is null means the join type is outer and return unmatched tuples from store.\n+    Object value;\n+    if (isLeft) {\n+      if (tuple != null) {\n+        value = store[1].getValidTuples(tuple);\n+      } else {\n+        value = store[1].getUnMatchedTuples();\n+      }\n+    } else {\n+      if (tuple != null) {\n+        value = store[0].getValidTuples(tuple);\n+      } else {\n+        value = store[0].getUnMatchedTuples();\n+      }\n+    }\n+    // Join the input tuple with the joined tuples\n+    if (value != null) {\n+      ArrayList<TimeEvent> joinedValues = (ArrayList<TimeEvent>)value;\n+      List<T> result = new ArrayList<>();\n+      for (TimeEvent joinedValue : joinedValues) {\n+        T output = createOutputTuple();\n+        Object tupleValue = null;\n+        if (tuple != null) {\n+          tupleValue = tuple.getValue();\n+        }\n+        copyValue(output, tupleValue, isLeft);\n+        copyValue(output, joinedValue.getValue(), !isLeft);\n+        result.add(output);\n+        joinedValue.setMatch(true);\n+      }\n+      if (tuple != null) {\n+        tuple.setMatch(true);\n+      }\n+      if (result.size() != 0) {\n+        outputPort.emit(result);\n+      }\n+    }\n+  }\n+\n+  // Emit the unmatched tuples, if the strategy is outer join\n+  @Override","path":"library/src/main/java/com/datatorrent/lib/join/AbstractJoinOperator.java","position":203,"original_position":203,"commit_id":"5427dad8465a99360c2037edf3ac1602a9264d4b","original_commit_id":"5427dad8465a99360c2037edf3ac1602a9264d4b","user":{"login":"chaithu14","id":8510691,"avatar_url":"https://avatars.githubusercontent.com/u/8510691?v=3","gravatar_id":"","url":"https://api.github.com/users/chaithu14","html_url":"https://github.com/chaithu14","followers_url":"https://api.github.com/users/chaithu14/followers","following_url":"https://api.github.com/users/chaithu14/following{/other_user}","gists_url":"https://api.github.com/users/chaithu14/gists{/gist_id}","starred_url":"https://api.github.com/users/chaithu14/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/chaithu14/subscriptions","organizations_url":"https://api.github.com/users/chaithu14/orgs","repos_url":"https://api.github.com/users/chaithu14/repos","events_url":"https://api.github.com/users/chaithu14/events{/privacy}","received_events_url":"https://api.github.com/users/chaithu14/received_events","type":"User","site_admin":false},"body":"Here the case is, if the strategy is not INNER_JOIN. In this case, the tuples which are not applied the join operation in expiry time period, will apply the join operation after expiry .","created_at":"2015-11-26T05:35:47Z","updated_at":"2015-11-26T05:35:47Z","html_url":"https://github.com/apache/incubator-apex-malhar/pull/113#discussion_r45945558","pull_request_url":"https://api.github.com/repos/apache/incubator-apex-malhar/pulls/113","_links":{"self":{"href":"https://api.github.com/repos/apache/incubator-apex-malhar/pulls/comments/45945558"},"html":{"href":"https://github.com/apache/incubator-apex-malhar/pull/113#discussion_r45945558"},"pull_request":{"href":"https://api.github.com/repos/apache/incubator-apex-malhar/pulls/113"}}},"pull_request":{"url":"https://api.github.com/repos/apache/incubator-apex-malhar/pulls/113","id":51786601,"html_url":"https://github.com/apache/incubator-apex-malhar/pull/113","diff_url":"https://github.com/apache/incubator-apex-malhar/pull/113.diff","patch_url":"https://github.com/apache/incubator-apex-malhar/pull/113.patch","issue_url":"https://api.github.com/repos/apache/incubator-apex-malhar/issues/113","number":113,"state":"open","locked":false,"title":"SPOI-4520 Implemented Inmemory Join Operator. Supported Inner, LeftOuter, RightOuter and FullOuter join 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