{"action":"created","comment":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/comments/68481823","id":68481823,"diff_hunk":"@@ -0,0 +1,79 @@\n+/*\n+ * Copyright © 2016 Cask Data, Inc.\n+ *\n+ * Licensed under the Apache License, Version 2.0 (the \"License\"); you may not\n+ * use this file except in compliance with the License. You may obtain a copy of\n+ * 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, WITHOUT\n+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the\n+ * License for the specific language governing permissions and limitations under\n+ * the License.\n+ */\n+\n+package co.cask.cdap.logging.gateway.handlers;\n+\n+import co.cask.cdap.logging.read.LogEvent;\n+import co.cask.http.HttpResponder;\n+import com.google.common.base.Throwables;\n+import com.google.common.collect.ImmutableMultimap;\n+import com.google.common.collect.Multimap;\n+import com.google.gson.Gson;\n+import org.jboss.netty.handler.codec.http.HttpHeaders;\n+\n+import java.io.IOException;\n+import java.nio.CharBuffer;\n+import java.util.concurrent.atomic.AtomicBoolean;\n+\n+/**\n+ * LogReader callback that sends JSON objects.\n+ */\n+public abstract class AbstractJSONCallback extends AbstractChunkedCallback {\n+  private static final Gson GSON = new Gson();\n+  private final AtomicBoolean started = new AtomicBoolean();\n+\n+  AbstractJSONCallback(HttpResponder responder) {\n+    super(responder);\n+  }\n+\n+  @Override\n+  protected Multimap<String, String> getResponseHeaders() {\n+    return ImmutableMultimap.of(HttpHeaders.Names.CONTENT_TYPE, \"application/json\");\n+  }\n+\n+  @Override\n+  public void writeFinal() throws IOException {\n+    // If an object has been sent already, then simply send closing bracket.\n+    // If nothing has been sent so far, then send '[]' indicating an empty list\n+    if (started.get()) {\n+      encodeSend(CharBuffer.wrap(\"]\"), true);\n+    } else {\n+      encodeSend(CharBuffer.wrap(\"[]\"), true);\n+    }\n+  }\n+\n+  @Override\n+  public void handleEvent(LogEvent logEvent) {\n+    try {\n+      // If it is the first logEvent, send an opening bracket.\n+      // If it is not the first logEvent, send a , to indicate that it is the next element in the list of JSON objects\n+      if (started.compareAndSet(false, true)) {","path":"cdap-watchdog/src/main/java/co/cask/cdap/logging/gateway/handlers/AbstractJSONCallback.java","position":63,"original_position":63,"commit_id":"298ebabb4ba47889f5b7d41bb05c65734cbd33e3","original_commit_id":"298ebabb4ba47889f5b7d41bb05c65734cbd33e3","user":{"login":"poornachandra","id":3181212,"avatar_url":"https://avatars.githubusercontent.com/u/3181212?v=3","gravatar_id":"","url":"https://api.github.com/users/poornachandra","html_url":"https://github.com/poornachandra","followers_url":"https://api.github.com/users/poornachandra/followers","following_url":"https://api.github.com/users/poornachandra/following{/other_user}","gists_url":"https://api.github.com/users/poornachandra/gists{/gist_id}","starred_url":"https://api.github.com/users/poornachandra/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/poornachandra/subscriptions","organizations_url":"https://api.github.com/users/poornachandra/orgs","repos_url":"https://api.github.com/users/poornachandra/repos","events_url":"https://api.github.com/users/poornachandra/events{/privacy}","received_events_url":"https://api.github.com/users/poornachandra/received_events","type":"User","site_admin":false},"body":"If the `init()` method is overridden, and `[` character is written from there then we don't need `started` boolean and the logic around it, right?","created_at":"2016-06-25T01:43:20Z","updated_at":"2016-06-25T01:43:20Z","html_url":"https://github.com/caskdata/cdap/pull/5913#discussion_r68481823","pull_request_url":"https://api.github.com/repos/caskdata/cdap/pulls/5913","_links":{"self":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/comments/68481823"},"html":{"href":"https://github.com/caskdata/cdap/pull/5913#discussion_r68481823"},"pull_request":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/5913"}}},"pull_request":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/5913","id":74685897,"html_url":"https://github.com/caskdata/cdap/pull/5913","diff_url":"https://github.com/caskdata/cdap/pull/5913.diff","patch_url":"https://github.com/caskdata/cdap/pull/5913.patch","issue_url":"https://api.github.com/repos/caskdata/cdap/issues/5913","number":5913,"state":"open","locked":false,"title":"CDAP-5893: JSON format for Log API","user":{"login":"gokulavasan","id":558459,"avatar_url":"https://avatars.githubusercontent.com/u/558459?v=3","gravatar_id":"","url":"https://api.github.com/users/gokulavasan","html_url":"https://github.com/gokulavasan","followers_url":"https://api.github.com/users/gokulavasan/followers","following_url":"https://api.github.com/users/gokulavasan/following{/other_user}","gists_url":"https://api.github.com/users/gokulavasan/gists{/gist_id}","starred_url":"https://api.github.com/users/gokulavasan/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gokulavasan/subscriptions","organizations_url":"https://api.github.com/users/gokulavasan/orgs","repos_url":"https://api.github.com/users/gokulavasan/repos","events_url":"https://api.github.com/users/gokulavasan/events{/privacy}","received_events_url":"https://api.github.com/users/gokulavasan/received_events","type":"User","site_admin":false},"body":"JIRA : https://issues.cask.co/browse/CDAP-5893\r\n\r\nBuild : http://builds.cask.co/browse/CDAP-DUT4236\r\n\r\nSummary: Added a new 'format' query parameter to the Log Handler endpoints (only for the ones that take in a run-id). It returns a JSON object (as described in the JIRA) instead of a string. Modified LogHandlerTestRun to test the new endpoints. Most of the changes are related to restructuring the ChunkedLogReader to abstract out the common pieces. 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