Refactor options and worker dependencies (#551)

This is the first part of a general options and worker dependencies cleanup. After this refactoring, user should follow the sequence below to setup worker and its dependencies:
- IWorkflowService is a client stub for communicating to Cadence Server
- WorkflowClient wraps IWorkflowService and provides higher level API to start, signal, query and wait for completion of workflows.
- WorkerFactory wraps WorkflowClient and can be used to create instances of Workers.
- Worker listens on a single task list and is created by a WorkerFactory.

Author: meiliang86

src/main/java/com/uber/cadence/client/WorkflowClient.java

@@ -107,77 +107,29 @@ public interface WorkflowClient {
   /** Replays workflow to the current state and returns empty result or error if replay failed. */
   String QUERY_TYPE_REPLAY_ONLY = "__replay_only";
 
-  /**
-   * Creates worker that connects to the local instance of the Cadence Service that listens on a
-   * default port (7933).
-   *
-   * @param domain domain that worker uses to poll.
-   */
-  static WorkflowClient newInstance(String domain) {
-    return WorkflowClientInternal.newInstance(domain);
-  }
-
-  /**
-   * Creates worker that connects to the local instance of the Cadence Service that listens on a
-   * default port (7933).
-   *
-   * @param domain domain that worker uses to poll.
-   * @param options Options (like {@link com.uber.cadence.converter.DataConverter}er override) for
-   *     configuring client.
-   */
-  static WorkflowClient newInstance(String domain, WorkflowClientOptions options) {
-    return WorkflowClientInternal.newInstance(domain, options);
-  }
-
-  /**
-   * Creates client that connects to an instance of the Cadence Service.
-   *
-   * @param host of the Cadence Service endpoint
-   * @param port of the Cadence Service endpoint
-   * @param domain domain that worker uses to poll.
-   */
-  static WorkflowClient newInstance(String host, int port, String domain) {
-    return WorkflowClientInternal.newInstance(host, port, domain);
-  }
-
-  /**
-   * Creates client that connects to an instance of the Cadence Service.
-   *
-   * @param host of the Cadence Service endpoint
-   * @param port of the Cadence Service endpoint
-   * @param domain domain that worker uses to poll.
-   * @param options Options (like {@link com.uber.cadence.converter.DataConverter}er override) for
-   *     configuring client.
-   */
-  static WorkflowClient newInstance(
-      String host, int port, String domain, WorkflowClientOptions options) {
-    return WorkflowClientInternal.newInstance(host, port, domain, options);
-  }
-
   /**
    * Creates client that connects to an instance of the Cadence Service.
    *
    * @param service client to the Cadence Service endpoint.
-   * @param domain domain that worker uses to poll.
    */
-  static WorkflowClient newInstance(IWorkflowService service, String domain) {
-    return WorkflowClientInternal.newInstance(service, domain);
+  static WorkflowClient newInstance(IWorkflowService service) {
+    return WorkflowClientInternal.newInstance(service, WorkflowClientOptions.defaultInstance());
   }
 
   /**
    * Creates client that connects to an instance of the Cadence Service.
    *
    * @param service client to the Cadence Service endpoint.
-   * @param domain domain that worker uses to poll.
    * @param options Options (like {@link com.uber.cadence.converter.DataConverter}er override) for
    *     configuring client.
    */
-  static WorkflowClient newInstance(
-      IWorkflowService service, String domain, WorkflowClientOptions options) {
-    return WorkflowClientInternal.newInstance(service, domain, options);
+  static WorkflowClient newInstance(IWorkflowService service, WorkflowClientOptions options) {
+    return WorkflowClientInternal.newInstance(service, options);
   }
 
-  String getDomain();
+  WorkflowClientOptions getOptions();
+
+  IWorkflowService getService();
 
   /**
    * Creates workflow client stub that can be used to start a single workflow execution. The first
@@ -728,7 +680,4 @@ static <A1, A2, A3, A4, A5, A6, R> CompletableFuture<R> execute(
       A6 arg6) {
     return WorkflowClientInternal.execute(workflow, arg1, arg2, arg3, arg4, arg5, arg6);
   }
-
-  /** Closes the workflow client and the underlying IWorkflowService when this method is called. */
-  void close();
 }

src/main/java/com/uber/cadence/client/WorkflowClientOptions.java

@@ -25,21 +25,47 @@
 
 /** Options for WorkflowClient configuration. */
 public final class WorkflowClientOptions {
+  private static final String DEFAULT_DOMAIN = "default";
+  private static final WorkflowClientOptions DEFAULT_INSTANCE;
+  private static final WorkflowClientInterceptor[] EMPTY_INTERCEPTOR_ARRAY =
+      new WorkflowClientInterceptor[0];
 
-  public static final class Builder {
+  static {
+    DEFAULT_INSTANCE = new Builder().build();
+  }
+
+  public static WorkflowClientOptions defaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  public static Builder newBuilder() {
+    return new Builder();
+  }
+
+  public static Builder newBuilder(WorkflowClientOptions options) {
+    return new Builder(options);
+  }
 
+  public static final class Builder {
+    private String domain = DEFAULT_DOMAIN;
     private DataConverter dataConverter = JsonDataConverter.getInstance();
     private WorkflowClientInterceptor[] interceptors = EMPTY_INTERCEPTOR_ARRAY;
-    private Scope metricsScope;
+    private Scope metricsScope = NoopScope.getInstance();
 
-    public Builder() {}
+    private Builder() {}
 
-    public Builder(WorkflowClientOptions options) {
+    private Builder(WorkflowClientOptions options) {
+      domain = options.getDomain();
       dataConverter = options.getDataConverter();
       interceptors = options.getInterceptors();
       metricsScope = options.getMetricsScope();
     }
 
+    public Builder setDomain(String domain) {
+      this.domain = domain;
+      return this;
+    }
+
     /**
      * Used to override default (JSON) data converter implementation.
      *
@@ -72,28 +98,30 @@ public Builder setMetricsScope(Scope metricsScope) {
     }
 
     public WorkflowClientOptions build() {
-      if (metricsScope == null) {
-        metricsScope = NoopScope.getInstance();
-      }
-      return new WorkflowClientOptions(dataConverter, interceptors, metricsScope);
+      return new WorkflowClientOptions(domain, dataConverter, interceptors, metricsScope);
     }
   }
 
-  private static final WorkflowClientInterceptor[] EMPTY_INTERCEPTOR_ARRAY =
-      new WorkflowClientInterceptor[0];
+  private final String domain;
   private final DataConverter dataConverter;
-
   private final WorkflowClientInterceptor[] interceptors;
-
   private final Scope metricsScope;
 
   private WorkflowClientOptions(
-      DataConverter dataConverter, WorkflowClientInterceptor[] interceptors, Scope metricsScope) {
+      String domain,
+      DataConverter dataConverter,
+      WorkflowClientInterceptor[] interceptors,
+      Scope metricsScope) {
+    this.domain = domain;
     this.dataConverter = dataConverter;
     this.interceptors = interceptors;
     this.metricsScope = metricsScope;
   }
 
+  public String getDomain() {
+    return domain;
+  }
+
   public DataConverter getDataConverter() {
     return dataConverter;
   }

src/main/java/com/uber/cadence/internal/external/ManualActivityCompletionClientFactoryImpl.java

@@ -24,6 +24,7 @@
 import com.uber.m3.tally.Scope;
 import com.uber.m3.util.ImmutableMap;
 import java.util.Map;
+import java.util.Objects;
 
 public class ManualActivityCompletionClientFactoryImpl
     extends ManualActivityCompletionClientFactory {
@@ -35,9 +36,9 @@ public class ManualActivityCompletionClientFactoryImpl
 
   public ManualActivityCompletionClientFactoryImpl(
       IWorkflowService service, String domain, DataConverter dataConverter, Scope metricsScope) {
-    this.service = service;
-    this.domain = domain;
-    this.dataConverter = dataConverter;
+    this.service = Objects.requireNonNull(service);
+    this.domain = Objects.requireNonNull(domain);
+    this.dataConverter = Objects.requireNonNull(dataConverter);
 
     Map<String, String> tags =
         new ImmutableMap.Builder<String, String>(1).put(MetricsTag.DOMAIN, domain).build();
@@ -54,16 +55,11 @@ public DataConverter getDataConverter() {
 
   @Override
   public ManualActivityCompletionClient getClient(byte[] taskToken) {
-    if (service == null) {
-      throw new IllegalStateException("required property service is null");
-    }
-    if (dataConverter == null) {
-      throw new IllegalStateException("required property dataConverter is null");
-    }
     if (taskToken == null || taskToken.length == 0) {
       throw new IllegalArgumentException("null or empty task token");
     }
-    return new ManualActivityCompletionClientImpl(service, taskToken, dataConverter, metricsScope);
+    return new ManualActivityCompletionClientImpl(
+        service, domain, taskToken, dataConverter, metricsScope);
   }
 
   @Override

src/main/java/com/uber/cadence/internal/external/ManualActivityCompletionClientImpl.java

@@ -57,11 +57,15 @@ class ManualActivityCompletionClientImpl extends ManualActivityCompletionClient
   private final Scope metricsScope;
 
   ManualActivityCompletionClientImpl(
-      IWorkflowService service, byte[] taskToken, DataConverter dataConverter, Scope metricsScope) {
+      IWorkflowService service,
+      String domain,
+      byte[] taskToken,
+      DataConverter dataConverter,
+      Scope metricsScope) {
     this.service = service;
     this.taskToken = taskToken;
     this.dataConverter = dataConverter;
-    this.domain = null;
+    this.domain = domain;
     this.execution = null;
     this.activityId = null;
     this.metricsScope = metricsScope;

src/main/java/com/uber/cadence/internal/sync/DeterministicRunnerImpl.java

@@ -273,6 +273,7 @@ public void runUntilAllBlocked() throws Throwable {
       if (nextWakeUpTime < currentTimeMillis() || nextWakeUpTime == Long.MAX_VALUE) {
         nextWakeUpTime = 0;
       }
+
     } finally {
       inRunUntilAllBlocked = false;
       // Close was requested while running

src/main/java/com/uber/cadence/internal/sync/TestActivityEnvironmentInternal.java

@@ -74,7 +74,7 @@ public TestActivityEnvironmentInternal(TestEnvironmentOptions options) {
     activityTaskHandler =
         new POJOActivityTaskHandler(
             new WorkflowServiceWrapper(workflowService),
-            testEnvironmentOptions.getDomain(),
+            testEnvironmentOptions.getWorkflowClientOptions().getDomain(),
             testEnvironmentOptions.getDataConverter(),
             heartbeatExecutor);
   }