{"action":"created","comment":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/comments/68646050","id":68646050,"diff_hunk":"@@ -0,0 +1,191 @@\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.app.preview;\n+\n+import co.cask.cdap.api.metrics.MetricsCollectionService;\n+import co.cask.cdap.app.runtime.ProgramRuntimeService;\n+import co.cask.cdap.common.conf.CConfiguration;\n+import co.cask.cdap.common.conf.Constants;\n+import co.cask.cdap.common.discovery.ResolvingDiscoverable;\n+import co.cask.cdap.common.http.CommonNettyHttpServiceBuilder;\n+import co.cask.cdap.common.logging.LoggingContextAccessor;\n+import co.cask.cdap.common.logging.ServiceLoggingContext;\n+import co.cask.cdap.common.metrics.MetricsReporterHook;\n+import co.cask.cdap.internal.app.runtime.artifact.SystemArtifactLoader;\n+import co.cask.cdap.internal.app.services.ApplicationLifecycleService;\n+import co.cask.cdap.internal.app.services.ProgramLifecycleService;\n+import co.cask.cdap.proto.Id;\n+import co.cask.http.HandlerHook;\n+import co.cask.http.HttpHandler;\n+import co.cask.http.NettyHttpService;\n+import com.google.common.collect.ImmutableList;\n+import com.google.common.collect.Lists;\n+import com.google.common.util.concurrent.AbstractIdleService;\n+import com.google.common.util.concurrent.Futures;\n+import com.google.inject.Inject;\n+import com.google.inject.name.Named;\n+import org.apache.twill.common.Cancellable;\n+import org.apache.twill.common.Threads;\n+import org.apache.twill.discovery.Discoverable;\n+import org.apache.twill.discovery.DiscoveryService;\n+import org.apache.twill.internal.ServiceListenerAdapter;\n+import org.slf4j.Logger;\n+import org.slf4j.LoggerFactory;\n+\n+import java.net.InetAddress;\n+import java.net.InetSocketAddress;\n+import java.util.List;\n+import java.util.Set;\n+import javax.annotation.Nullable;\n+\n+/**\n+ * Preview Server.\n+ */\n+public class PreviewServer extends AbstractIdleService {\n+\n+  private static final Logger LOG = LoggerFactory.getLogger(PreviewServer.class);\n+\n+  private final DiscoveryService discoveryService;\n+  private final InetAddress hostname;\n+  private final ProgramRuntimeService programRuntimeService;\n+  private final ApplicationLifecycleService applicationLifecycleService;\n+  private final ProgramLifecycleService programLifecycleService;\n+  private final SystemArtifactLoader systemArtifactLoader;\n+\n+  private NettyHttpService httpService;","path":"cdap-app-fabric/src/main/java/co/cask/cdap/app/preview/PreviewServer.java","position":69,"original_position":69,"commit_id":"665a33975cef6717644174a6150cfe47c15580e7","original_commit_id":"665a33975cef6717644174a6150cfe47c15580e7","user":{"login":"chtyim","id":885032,"avatar_url":"https://avatars.githubusercontent.com/u/885032?v=3","gravatar_id":"","url":"https://api.github.com/users/chtyim","html_url":"https://github.com/chtyim","followers_url":"https://api.github.com/users/chtyim/followers","following_url":"https://api.github.com/users/chtyim/following{/other_user}","gists_url":"https://api.github.com/users/chtyim/gists{/gist_id}","starred_url":"https://api.github.com/users/chtyim/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/chtyim/subscriptions","organizations_url":"https://api.github.com/users/chtyim/orgs","repos_url":"https://api.github.com/users/chtyim/repos","events_url":"https://api.github.com/users/chtyim/events{/privacy}","received_events_url":"https://api.github.com/users/chtyim/received_events","type":"User","site_admin":false},"body":"final. You can construct it in constructor without starting it.","created_at":"2016-06-27T20:06:47Z","updated_at":"2016-06-27T20:06:47Z","html_url":"https://github.com/caskdata/cdap/pull/5929#discussion_r68646050","pull_request_url":"https://api.github.com/repos/caskdata/cdap/pulls/5929","_links":{"self":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/comments/68646050"},"html":{"href":"https://github.com/caskdata/cdap/pull/5929#discussion_r68646050"},"pull_request":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/5929"}}},"pull_request":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/5929","id":75051881,"html_url":"https://github.com/caskdata/cdap/pull/5929","diff_url":"https://github.com/caskdata/cdap/pull/5929.diff","patch_url":"https://github.com/caskdata/cdap/pull/5929.patch","issue_url":"https://api.github.com/repos/caskdata/cdap/issues/5929","number":5929,"state":"open","locked":false,"title":"Feature/preview service implementation","user":{"login":"gsps1","id":1328150,"avatar_url":"https://avatars.githubusercontent.com/u/1328150?v=3","gravatar_id":"","url":"https://api.github.com/users/gsps1","html_url":"https://github.com/gsps1","followers_url":"https://api.github.com/users/gsps1/followers","following_url":"https://api.github.com/users/gsps1/following{/other_user}","gists_url":"https://api.github.com/users/gsps1/gists{/gist_id}","starred_url":"https://api.github.com/users/gsps1/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gsps1/subscriptions","organizations_url":"https://api.github.com/users/gsps1/orgs","repos_url":"https://api.github.com/users/gsps1/repos","events_url":"https://api.github.com/users/gsps1/events{/privacy}","received_events_url":"https://api.github.com/users/gsps1/received_events","type":"User","site_admin":false},"body":"This is initial check-in for Preview Implementation \r\nJIRA: https://issues.cask.co/browse/CDAP-5781\r\n\r\nThis PR covers the following \r\n\r\n- PreviewMain with local modules and few instances shared with Standalone. \r\n- PreviewMain starts the required services for Preview\r\n- PreviewService starts PreviewHttpHandler which handles requests to start preview, get status of preview, etc\r\n- PreviewManager interface, currently only implementing deploy and running a data pipeline app.\r\n- PreviewDatasetFramework delegating the SYSTEM dataset calls to local (preview space) dsFramework and User namespace calls to actual dsFramework (standalone data space)\r\n- Along with data directory we will have a preview directory in cdap-home when preview is executed. \r\n\r\nUpcoming PR:\r\n\r\n- PreviewStore to store intermediate data between stages\r\n- PreviewEmitter and Application changes to emit intermediate data\r\n- PreviewManager completion \r\n- Test 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