{"action":"created","comment":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/comments/79293833","id":79293833,"diff_hunk":"@@ -0,0 +1,213 @@\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.route.store;\n+\n+import co.cask.cdap.api.common.Bytes;\n+import co.cask.cdap.common.NotFoundException;\n+import co.cask.cdap.common.io.Codec;\n+import co.cask.cdap.common.service.ServiceDiscoverable;\n+import co.cask.cdap.common.zookeeper.ZKExtOperations;\n+import co.cask.cdap.internal.guava.reflect.TypeToken;\n+import co.cask.cdap.proto.id.ProgramId;\n+import com.google.common.base.Supplier;\n+import com.google.common.base.Suppliers;\n+import com.google.common.base.Throwables;\n+import com.google.common.collect.Maps;\n+import com.google.common.util.concurrent.FutureCallback;\n+import com.google.common.util.concurrent.Futures;\n+import com.google.common.util.concurrent.SettableFuture;\n+import com.google.gson.Gson;\n+import com.google.inject.Inject;\n+import org.apache.twill.common.Threads;\n+import org.apache.twill.zookeeper.NodeData;\n+import org.apache.twill.zookeeper.OperationFuture;\n+import org.apache.twill.zookeeper.ZKClient;\n+import org.apache.zookeeper.KeeperException;\n+import org.apache.zookeeper.WatchedEvent;\n+import org.apache.zookeeper.Watcher;\n+import org.slf4j.Logger;\n+import org.slf4j.LoggerFactory;\n+\n+import java.io.IOException;\n+import java.lang.reflect.Type;\n+import java.util.Map;\n+import java.util.concurrent.ConcurrentMap;\n+import java.util.concurrent.ExecutionException;\n+import java.util.concurrent.Future;\n+import java.util.concurrent.TimeUnit;\n+import java.util.concurrent.TimeoutException;\n+\n+/**\n+ * RouteStore where the routes are stored in a ZK persistent node. This is intended for use in distributed mode.\n+ */\n+public class ZKRouteStore implements RouteStore {\n+  private static final Logger LOG = LoggerFactory.getLogger(ZKRouteStore.class);\n+  private static final Gson GSON = new Gson();\n+  private static final Type MAP_STRING_INTEGER_TYPE = new TypeToken<Map<String, Integer>>() { }.getType();\n+  private static final int ZK_TIMEOUT_SECS = 5;\n+\n+  private final ZKClient zkClient;\n+  private final ConcurrentMap<ProgramId, SettableFuture<RouteConfig>> routeConfigMap;\n+\n+  @Inject\n+  public ZKRouteStore(ZKClient zkClient) {\n+    this.zkClient = zkClient;\n+    this.routeConfigMap = Maps.newConcurrentMap();\n+  }\n+\n+  @Override\n+  public void store(final ProgramId serviceId, final RouteConfig routeConfig) {\n+    Supplier<RouteConfig> supplier = Suppliers.ofInstance(routeConfig);\n+    final SettableFuture<RouteConfig> settableFuture = SettableFuture.create();\n+    Futures.addCallback(ZKExtOperations.createOrSet(zkClient, getZKPath(serviceId), supplier, ROUTE_CONFIG_CODEC, 10),\n+                        new FutureCallback<RouteConfig>() {\n+                          @Override\n+                          public void onSuccess(RouteConfig result) {\n+                            settableFuture.set(result);\n+                            routeConfigMap.put(serviceId, settableFuture);\n+                          }\n+\n+                          @Override\n+                          public void onFailure(Throwable t) {\n+                            settableFuture.setException(t);\n+                          }\n+                        });\n+    try {\n+      settableFuture.get(ZK_TIMEOUT_SECS, TimeUnit.SECONDS);\n+    } catch (ExecutionException | InterruptedException | TimeoutException ex) {\n+      throw Throwables.propagate(ex);\n+    }\n+  }\n+\n+  @Override\n+  public void delete(final ProgramId serviceId) throws NotFoundException {\n+    OperationFuture<String> future = zkClient.delete(getZKPath(serviceId));\n+    final SettableFuture<String> settableFuture = SettableFuture.create();\n+    Futures.addCallback(future, new FutureCallback<String>() {\n+      @Override\n+      public void onSuccess(String result) {\n+        routeConfigMap.remove(serviceId);\n+        settableFuture.set(result);\n+      }\n+\n+      @Override\n+      public void onFailure(Throwable t) {\n+        settableFuture.setException(t);\n+      }\n+    }, Threads.SAME_THREAD_EXECUTOR);\n+\n+    try {\n+      settableFuture.get(ZK_TIMEOUT_SECS, TimeUnit.SECONDS);\n+    } catch (ExecutionException | InterruptedException | TimeoutException ex) {\n+      if (ex.getCause() instanceof KeeperException.NoNodeException) {\n+        throw new NotFoundException(String.format(\"Route Config for Service %s was not found.\", serviceId));\n+      }\n+      throw Throwables.propagate(ex);\n+    }\n+  }\n+\n+  @Override\n+  public RouteConfig fetch(final ProgramId serviceId) throws NotFoundException {\n+    if (routeConfigMap.putIfAbsent(serviceId, SettableFuture.<RouteConfig>create()) != null) {\n+      return getConfig(serviceId, routeConfigMap.get(serviceId));\n+    }\n+    Future<RouteConfig> future = getAndWatchData(serviceId, new ZKRouteWatcher(serviceId));\n+    return getConfig(serviceId, future);\n+  }\n+\n+  private RouteConfig getConfig(ProgramId serviceId, Future<RouteConfig> future) throws NotFoundException {\n+    try {\n+      return future.get(ZK_TIMEOUT_SECS, TimeUnit.SECONDS);\n+    } catch (InterruptedException | ExecutionException | TimeoutException e) {\n+      if (e.getCause() instanceof KeeperException.NoNodeException) {\n+        throw new NotFoundException(String.format(\"Route Config for Service %s was not found.\", serviceId));\n+      }\n+      throw Throwables.propagate(e);\n+    }\n+  }\n+\n+  private static String getZKPath(ProgramId serviceId) {\n+    return String.format(\"/routestore/%s\", ServiceDiscoverable.getName(serviceId));\n+  }\n+\n+  static final Codec<RouteConfig> ROUTE_CONFIG_CODEC = new Codec<RouteConfig>() {\n+\n+    @Override\n+    public byte[] encode(RouteConfig object) throws IOException {\n+      return Bytes.toBytes(GSON.toJson(object.getRoutes()));\n+    }\n+\n+    @Override\n+    public RouteConfig decode(byte[] data) throws IOException {\n+      Map<String, Integer> routes = GSON.fromJson(Bytes.toString(data), MAP_STRING_INTEGER_TYPE);\n+      return new RouteConfig(routes);\n+    }\n+  };\n+\n+  private Future<RouteConfig> getAndWatchData(final ProgramId serviceId, Watcher watcher) {\n+    OperationFuture<NodeData> future = zkClient.getData(getZKPath(serviceId), watcher);\n+    final SettableFuture<RouteConfig> settableFuture = SettableFuture.create();","path":"cdap-app-fabric/src/main/java/co/cask/cdap/route/store/ZKRouteStore.java","position":163,"original_position":163,"commit_id":"cca2d1cbbc77306df6b71b31c23a66232a8c13c3","original_commit_id":"cca2d1cbbc77306df6b71b31c23a66232a8c13c3","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":"Instead of creating a new future here, we should use the future from `routeConfigMap`, right? Since other threads may be waiting on that future.","created_at":"2016-09-17T23:21:04Z","updated_at":"2016-09-17T23:43:50Z","html_url":"https://github.com/caskdata/cdap/pull/6744#discussion_r79293833","pull_request_url":"https://api.github.com/repos/caskdata/cdap/pulls/6744","_links":{"self":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/comments/79293833"},"html":{"href":"https://github.com/caskdata/cdap/pull/6744#discussion_r79293833"},"pull_request":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/6744"}}},"pull_request":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/6744","id":85502088,"html_url":"https://github.com/caskdata/cdap/pull/6744","diff_url":"https://github.com/caskdata/cdap/pull/6744.diff","patch_url":"https://github.com/caskdata/cdap/pull/6744.patch","issue_url":"https://api.github.com/repos/caskdata/cdap/issues/6744","number":6744,"state":"open","locked":false,"title":"CDAP-7268 CDAP-7269 REST Endpoint to store/retrieve config in RouteStore","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":"JIRAs:\r\nhttps://issues.cask.co/browse/CDAP-7268\r\nhttps://issues.cask.co/browse/CDAP-7269\r\nhttps://issues.cask.co/browse/CDAP-7272\r\n\r\nBuild:\r\nhttp://builds.cask.co/browse/CDAP-RUT171-1\r\n\r\nSummary:\r\ni) Introduce RouteStore interface which provides methods to store, retrieve, delete route configurations for user services\r\nii) LocalRouteStore -> stores the routes in a KVTable. \r\niii) ZKRouteStore -> stores the routes in ZK\r\niv) Changes to ProgramLifecycleHttpHandler to add three endpoints to get/put/delete routes.\r\nv) Routes have to be a map of string to integers and the values should add up to 100.\r\n\r\n\r\n","created_at":"2016-09-16T00:13:16Z","updated_at":"2016-09-17T23:43:50Z","closed_at":null,"merged_at":null,"merge_commit_sha":"223e021f057287329e1ef5f715a9625c3f134f4c","assignee":null,"assignees":[],"milestone":null,"commits_url":"https://api.github.com/repos/caskdata/cdap/pulls/6744/commits","review_comments_url":"https://api.github.com/repos/caskdata/cdap/pulls/6744/comments","review_comment_url":"https://api.github.com/repos/caskdata/cdap/pulls/comments{/number}","comments_url":"https://api.github.com/repos/caskdata/cdap/issues/6744/comments","statuses_url":"https://api.github.com/repos/caskdata/cdap/statuses/cca2d1cbbc77306df6b71b31c23a66232a8c13c3","head":{"label":"caskdata:fix/cdap-7268","ref":"fix/cdap-7268","sha":"cca2d1cbbc77306df6b71b31c23a66232a8c13c3","user":{"login":"caskdata","id":8123023,"avatar_url":"https://avatars.githubusercontent.com/u/8123023?v=3","gravatar_id":"","url":"https://api.github.com/users/caskdata","html_url":"https://github.com/caskdata","followers_url":"https://api.github.com/users/caskdata/followers","following_url":"https://api.github.com/users/caskdata/following{/other_user}","gists_url":"https://api.github.com/users/caskdata/gists{/gist_id}","starred_url":"https://api.github.com/users/caskdata/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/caskdata/subscriptions","organizations_url":"https://api.github.com/users/caskdata/orgs","repos_url":"https://api.github.com/users/caskdata/repos","events_url":"https://api.github.com/users/caskdata/events{/privacy}","received_events_url":"https://api.github.com/users/caskdata/received_events","type":"Organization","site_admin":false},"repo":{"id":22542759,"name":"cdap","full_name":"caskdata/cdap","owner":{"login":"caskdata","id":8123023,"avatar_url":"https://avatars.githubusercontent.com/u/8123023?v=3","gravatar_id":"","url":"https://api.github.com/users/caskdata","html_url":"https://github.com/caskdata","followers_url":"https://api.github.com/users/caskdata/followers","following_url":"https://api.github.com/users/caskdata/following{/other_user}","gists_url":"https://api.github.com/users/caskdata/gists{/gist_id}","starred_url":"https://api.github.com/users/caskdata/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/caskdata/subscriptions","organizations_url":"https://api.github.com/users/caskdata/orgs","repos_url":"https://api.github.com/users/caskdata/repos","events_url":"https://api.github.com/users/caskdata/events{/privacy}","received_events_url":"https://api.github.com/users/caskdata/received_events","type":"Organization","site_admin":false},"private":false,"html_url":"https://github.com/caskdata/cdap","description":"Cask 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