Code refactor

java/server/src/org/openqa/selenium/grid/config/Config.java

@@ -17,6 +17,8 @@
 
 package org.openqa.selenium.grid.config;
 
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
 import java.util.List;
 import java.util.Optional;
 import java.util.Set;
@@ -40,4 +42,30 @@ default Optional<Integer> getInt(String section, String option) {
   default Optional<Boolean> getBool(String section, String option) {
     return get(section, option).map(Boolean::parseBoolean);
   }
+
+  default <X> Object getClass(String section, String option, Class<X> typeOfClass, String defaultClazz) {
+    String clazz = get(section, option).orElse(defaultClazz);
+
+    try {
+      Class<?> ClassClazz = Class.forName(clazz);
+      Method create = ClassClazz.getMethod("create", Config.class);
+
+      if (!Modifier.isStatic(create.getModifiers())) {
+        throw new IllegalArgumentException(String.format(
+            "Class %s's `create(Config)` method must be static", clazz));
+      }
+
+      if (!typeOfClass.isAssignableFrom(create.getReturnType())) {
+        throw new IllegalArgumentException(String.format(
+            "Class %s's `create(Config)` method must be static", clazz));
+      }
+
+      return create.invoke(null, this);
+    } catch (NoSuchMethodException e) {
+      throw new IllegalArgumentException(String.format(
+          "Class %s must have a static `create(Config)` method", clazz));
+    } catch (ReflectiveOperationException e) {
+      throw new IllegalArgumentException("Unable to find class: " + clazz, e);
+    }
+  }
 }

java/server/src/org/openqa/selenium/grid/distributor/config/BUILD.bazel

@@ -11,7 +11,6 @@ java_library(
         "//java/client/src/org/openqa/selenium/remote",
         "//java/server/src/org/openqa/selenium/grid/config",
         "//java/server/src/org/openqa/selenium/grid/distributor",
-        "//java/server/src/org/openqa/selenium/grid/distributor/remote",
         artifact("com.beust:jcommander"),
     ],
 )

java/server/src/org/openqa/selenium/grid/distributor/config/DistributorOptions.java

@@ -20,20 +20,16 @@
 import org.openqa.selenium.grid.config.Config;
 import org.openqa.selenium.grid.config.ConfigException;
 import org.openqa.selenium.grid.distributor.Distributor;
-import org.openqa.selenium.grid.distributor.remote.RemoteDistributor;
-import org.openqa.selenium.remote.http.HttpClient;
-import org.openqa.selenium.remote.tracing.Tracer;
 
 import java.net.URI;
 import java.net.URISyntaxException;
-import java.net.URL;
 import java.util.Optional;
-
-import static org.openqa.selenium.net.Urls.fromUri;
+import java.util.logging.Logger;
 
 public class DistributorOptions {
 
   private static final String DISTRIBUTOR_SECTION = "distributor";
+  private static final Logger LOG = Logger.getLogger(DistributorOptions.class.getName());
 
   private final Config config;
 
@@ -78,11 +74,7 @@ public URI getDistributorUri() {
     }
   }
 
-  public Distributor getDistributor(Tracer tracer, HttpClient.Factory clientFactory) {
-    URL distributorUrl = fromUri(getDistributorUri());
-    return new RemoteDistributor(
-        tracer,
-        clientFactory,
-        distributorUrl);
+  public Distributor getDistributor(String defaultClass) {
+    return (Distributor) config.getClass(DISTRIBUTOR_SECTION, "implementation", Distributor.class, defaultClass);
   }
 }

java/server/src/org/openqa/selenium/grid/distributor/httpd/BUILD.bazel

@@ -23,6 +23,7 @@ java_library(
         "//java/server/src/org/openqa/selenium/grid/sessionmap/config",
         "//java/server/src/org/openqa/selenium/grid/web",
         "//java/server/src/org/openqa/selenium/netty/server",
+        "//java/server/src/org/openqa/selenium/grid/distributor/config",
         artifact("com.beust:jcommander"),
         artifact("com.google.guava:guava"),
     ],

java/server/src/org/openqa/selenium/grid/distributor/httpd/DistributorServer.java

@@ -23,27 +23,19 @@
 import com.google.common.net.MediaType;
 import org.openqa.selenium.BuildInfo;
 import org.openqa.selenium.cli.CliCommand;
-import org.openqa.selenium.events.EventBus;
 import org.openqa.selenium.grid.TemplateGridCommand;
 import org.openqa.selenium.grid.config.Config;
 import org.openqa.selenium.grid.config.Role;
 import org.openqa.selenium.grid.data.DistributorStatus;
 import org.openqa.selenium.grid.distributor.Distributor;
-import org.openqa.selenium.grid.distributor.local.LocalDistributor;
-import org.openqa.selenium.grid.log.LoggingOptions;
+import org.openqa.selenium.grid.distributor.config.DistributorOptions;
 import org.openqa.selenium.grid.server.BaseServerOptions;
-import org.openqa.selenium.grid.server.EventBusOptions;
-import org.openqa.selenium.grid.server.NetworkOptions;
 import org.openqa.selenium.grid.server.Server;
-import org.openqa.selenium.grid.sessionmap.SessionMap;
-import org.openqa.selenium.grid.sessionmap.config.SessionMapOptions;
 import org.openqa.selenium.netty.server.NettyServer;
 import org.openqa.selenium.remote.http.Contents;
-import org.openqa.selenium.remote.http.HttpClient;
 import org.openqa.selenium.remote.http.HttpHandler;
 import org.openqa.selenium.remote.http.HttpResponse;
 import org.openqa.selenium.remote.http.Route;
-import org.openqa.selenium.remote.tracing.Tracer;
 
 import java.util.Collections;
 import java.util.Set;
@@ -61,6 +53,7 @@
 public class DistributorServer extends TemplateGridCommand {
 
   private static final Logger LOG = Logger.getLogger(DistributorServer.class.getName());
+  private static final String LOCAL_DISTRIBUTOR_SERVER = "org.openqa.selenium.grid.distributor.local.LocalDistributor";
 
   @Override
   public String getName() {
@@ -94,25 +87,11 @@ protected Config getDefaultConfig() {
 
   @Override
   protected void execute(Config config) {
-    LoggingOptions loggingOptions = new LoggingOptions(config);
-    Tracer tracer = loggingOptions.getTracer();
-
-    EventBusOptions events = new EventBusOptions(config);
-    EventBus bus = events.getEventBus();
-
-    NetworkOptions networkOptions = new NetworkOptions(config);
-    HttpClient.Factory clientFactory = networkOptions.getHttpClientFactory(tracer);
-
-    SessionMap sessions = new SessionMapOptions(config).getSessionMap();
-
     BaseServerOptions serverOptions = new BaseServerOptions(config);
+    DistributorOptions distributorOptions = new DistributorOptions(config);
+
+    Distributor distributor = distributorOptions.getDistributor(LOCAL_DISTRIBUTOR_SERVER);
 
-    Distributor distributor = new LocalDistributor(
-      tracer,
-      bus,
-      clientFactory,
-      sessions,
-      serverOptions.getRegistrationSecret());
     HttpHandler readinessCheck = req -> {
       DistributorStatus status = distributor.getStatus();
       if (status.hasCapacity()) {

java/server/src/org/openqa/selenium/grid/distributor/local/BUILD.bazel

@@ -19,6 +19,11 @@ java_library(
         "//java/server/src/org/openqa/selenium/grid/node",
         "//java/server/src/org/openqa/selenium/grid/node/remote",
         "//java/server/src/org/openqa/selenium/grid/sessionmap",
+        "//java/server/src/org/openqa/selenium/grid/config",
+        "//java/server/src/org/openqa/selenium/grid/log",
+        "//java/server/src/org/openqa/selenium/grid/server",
+        "//java/server/src/org/openqa/selenium/grid/sessionmap/config",
+
         artifact("com.google.guava:guava"),
     ],
 )

java/server/src/org/openqa/selenium/grid/distributor/local/LocalDistributor.java

@@ -25,6 +25,7 @@
 import org.openqa.selenium.SessionNotCreatedException;
 import org.openqa.selenium.concurrent.Regularly;
 import org.openqa.selenium.events.EventBus;
+import org.openqa.selenium.grid.config.Config;
 import org.openqa.selenium.grid.data.CreateSessionRequest;
 import org.openqa.selenium.grid.data.CreateSessionResponse;
 import org.openqa.selenium.grid.data.DistributorStatus;
@@ -33,9 +34,14 @@
 import org.openqa.selenium.grid.data.NodeRemovedEvent;
 import org.openqa.selenium.grid.data.NodeStatus;
 import org.openqa.selenium.grid.distributor.Distributor;
+import org.openqa.selenium.grid.log.LoggingOptions;
 import org.openqa.selenium.grid.node.Node;
 import org.openqa.selenium.grid.node.remote.RemoteNode;
+import org.openqa.selenium.grid.server.BaseServerOptions;
+import org.openqa.selenium.grid.server.EventBusOptions;
+import org.openqa.selenium.grid.server.NetworkOptions;
 import org.openqa.selenium.grid.sessionmap.SessionMap;
+import org.openqa.selenium.grid.sessionmap.config.SessionMapOptions;
 import org.openqa.selenium.internal.Require;
 import org.openqa.selenium.json.Json;
 import org.openqa.selenium.json.JsonOutput;
@@ -109,6 +115,16 @@ public LocalDistributor(
     bus.addListener(NODE_STATUS, event -> refresh(event.getData(NodeStatus.class)));
   }
 
+  public static Distributor create(Config config) {
+    Tracer tracer = new LoggingOptions(config).getTracer();
+    EventBus bus = new EventBusOptions(config).getEventBus();
+    HttpClient.Factory clientFactory = new NetworkOptions(config).getHttpClientFactory(tracer);
+    SessionMap sessions = new SessionMapOptions(config).getSessionMap();
+    BaseServerOptions serverOptions = new BaseServerOptions(config);
+
+    return new LocalDistributor(tracer, bus, clientFactory, sessions, serverOptions.getRegistrationSecret());
+  }
+
   @Override
   public CreateSessionResponse newSession(HttpRequest request)
       throws SessionNotCreatedException {

java/server/src/org/openqa/selenium/grid/distributor/remote/BUILD.bazel

@@ -14,5 +14,8 @@ java_library(
         "//java/server/src/org/openqa/selenium/grid/distributor",
         "//java/server/src/org/openqa/selenium/grid/node",
         "//java/server/src/org/openqa/selenium/grid/web",
+        "//java/server/src/org/openqa/selenium/grid/config",
+        "//java/server/src/org/openqa/selenium/grid/log",
+        "//java/server/src/org/openqa/selenium/grid/server"
     ],
 )

java/server/src/org/openqa/selenium/grid/distributor/remote/RemoteDistributor.java

@@ -35,6 +35,7 @@
 import java.util.UUID;
 import java.util.logging.Logger;
 
+import static org.openqa.selenium.net.Urls.fromUri;
 import static org.openqa.selenium.remote.http.Contents.asJson;
 import static org.openqa.selenium.remote.http.HttpMethod.DELETE;
 import static org.openqa.selenium.remote.http.HttpMethod.GET;

java/server/src/org/openqa/selenium/grid/router/httpd/BUILD.bazel

@@ -16,6 +16,7 @@ java_library(
         "//java/server/src/org/openqa/selenium/grid/data",
         "//java/server/src/org/openqa/selenium/grid/distributor",
         "//java/server/src/org/openqa/selenium/grid/distributor/config",
+        "//java/server/src/org/openqa/selenium/grid/distributor/remote",
         "//java/server/src/org/openqa/selenium/grid/graphql",
         "//java/server/src/org/openqa/selenium/grid/log",
         "//java/server/src/org/openqa/selenium/grid/node",

java/server/src/org/openqa/selenium/grid/router/httpd/RouterServer.java

@@ -28,6 +28,7 @@
 import org.openqa.selenium.grid.config.Role;
 import org.openqa.selenium.grid.distributor.Distributor;
 import org.openqa.selenium.grid.distributor.config.DistributorOptions;
+import org.openqa.selenium.grid.distributor.remote.RemoteDistributor;
 import org.openqa.selenium.grid.graphql.GraphqlHandler;
 import org.openqa.selenium.grid.log.LoggingOptions;
 import org.openqa.selenium.grid.router.ProxyCdpIntoGrid;
@@ -43,6 +44,8 @@
 import org.openqa.selenium.remote.http.Route;
 import org.openqa.selenium.remote.tracing.Tracer;
 
+import java.net.URI;
+import java.net.URL;
 import java.util.Collections;
 import java.util.Set;
 import java.util.logging.Logger;
@@ -51,6 +54,7 @@
 import static org.openqa.selenium.grid.config.StandardGridRoles.DISTRIBUTOR_ROLE;
 import static org.openqa.selenium.grid.config.StandardGridRoles.HTTPD_ROLE;
 import static org.openqa.selenium.grid.config.StandardGridRoles.SESSION_MAP_ROLE;
+import static org.openqa.selenium.net.Urls.fromUri;
 import static org.openqa.selenium.remote.http.Route.get;
 
 @AutoService(CliCommand.class)
@@ -102,7 +106,12 @@ protected void execute(Config config) {
     BaseServerOptions serverOptions = new BaseServerOptions(config);
 
     DistributorOptions distributorOptions = new DistributorOptions(config);
-    Distributor distributor = distributorOptions.getDistributor(tracer, clientFactory);
+    URL distributorUrl = fromUri(distributorOptions.getDistributorUri());
+    Distributor distributor = new RemoteDistributor(
+        tracer,
+        clientFactory,
+        distributorUrl
+    );
 
     GraphqlHandler graphqlHandler = new GraphqlHandler(distributor, serverOptions.getExternalUri().toString());
 

java/server/src/org/openqa/selenium/grid/server/EventBusOptions.java

@@ -50,28 +50,6 @@ public EventBus getEventBus() {
   }
 
   private EventBus createBus() {
-    String clazzName = config.get("events", "implementation").orElse(DEFAULT_CLASS);
-    LOG.info("Creating event bus: " + clazzName);
-    try {
-      Class<?> busClazz = Class.forName(clazzName);
-      Method create = busClazz.getMethod("create", Config.class);
-
-      if (!Modifier.isStatic(create.getModifiers())) {
-        throw new IllegalArgumentException(String.format(
-            "Event bus class %s's `create(Config)` method must be static", clazzName));
-      }
-
-      if (!EventBus.class.isAssignableFrom(create.getReturnType())) {
-        throw new IllegalArgumentException(String.format(
-            "Event bus class %s's `create(Config)` method must return an EventBus", clazzName));
-      }
-
-      return (EventBus) create.invoke(null, config);
-    } catch (NoSuchMethodException e) {
-      throw new IllegalArgumentException(String.format(
-          "Event bus class %s must have a static `create(Config)` method", clazzName));
-    } catch (ReflectiveOperationException e) {
-      throw new IllegalArgumentException("Unable to find event bus class: " + clazzName, e);
-    }
+    return (EventBus) config.getClass("events", "implementation", EventBus.class, DEFAULT_CLASS);
   }
 }

java/server/src/org/openqa/selenium/grid/sessionmap/config/SessionMapOptions.java

@@ -21,8 +21,6 @@
 import org.openqa.selenium.grid.config.ConfigException;
 import org.openqa.selenium.grid.sessionmap.SessionMap;
 
-import java.lang.reflect.Method;
-import java.lang.reflect.Modifier;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.Optional;
@@ -78,28 +76,6 @@ public URI getSessionMapUri() {
   }
 
   public SessionMap getSessionMap() {
-    String clazz = config.get(SESSIONS_SECTION, "implementation").orElse(DEFAULT_SESSION_MAP);
-    LOG.info("Creating session map: " + clazz);
-    try {
-      Class<?> busClazz = Class.forName(clazz);
-      Method create = busClazz.getMethod("create", Config.class);
-
-      if (!Modifier.isStatic(create.getModifiers())) {
-        throw new IllegalArgumentException(String.format(
-          "Session map class %s's `create(Config)` method must be static", clazz));
-      }
-
-      if (!SessionMap.class.isAssignableFrom(create.getReturnType())) {
-        throw new IllegalArgumentException(String.format(
-          "Session map class %s's `create(Config)` method must return a SessionMap", clazz));
-      }
-
-      return (SessionMap) create.invoke(null, config);
-    } catch (NoSuchMethodException e) {
-      throw new IllegalArgumentException(String.format(
-        "Session map class %s must have a static `create(Config)` method", clazz));
-    } catch (ReflectiveOperationException e) {
-      throw new IllegalArgumentException("Unable to find event bus class: " + clazz, e);
-    }
+    return  (SessionMap) config.getClass(SESSIONS_SECTION, "implementation", SessionMap.class, DEFAULT_SESSION_MAP);
   }
 }