Add activity tasklist rate limiter option to worker options

src/main/java/com/uber/cadence/internal/worker/ActivityPollTask.java

@@ -22,6 +22,7 @@
 import com.uber.cadence.PollForActivityTaskResponse;
 import com.uber.cadence.ServiceBusyError;
 import com.uber.cadence.TaskList;
+import com.uber.cadence.TaskListMetadata;
 import com.uber.cadence.internal.metrics.MetricsType;
 import com.uber.cadence.serviceclient.IWorkflowService;
 import com.uber.m3.tally.Stopwatch;
@@ -56,6 +57,13 @@ public ActivityWorker.MeasurableActivityTask poll() throws TException {
     pollRequest.setDomain(domain);
     pollRequest.setIdentity(options.getIdentity());
     pollRequest.setTaskList(new TaskList().setName(taskList));
+
+    if (options.getTaskListActivitiesPerSecond() > 0) {
+      TaskListMetadata metadata = new TaskListMetadata();
+      metadata.setMaxTasksPerSecond(options.getTaskListActivitiesPerSecond());
+      pollRequest.setTaskListMetadata(metadata);
+    }
+
     if (log.isDebugEnabled()) {
       log.debug("poll request begin: " + pollRequest);
     }

src/main/java/com/uber/cadence/internal/worker/SingleWorkerOptions.java

@@ -30,20 +30,15 @@ public final class SingleWorkerOptions {
   public static final class Builder {
 
     private String identity;
-
     private DataConverter dataConverter;
-
     private int taskExecutorThreadPoolSize = 100;
-
+    private double taskListActivitiesPerSecond;
     private PollerOptions pollerOptions;
-
     /** TODO: Dynamic expiration based on activity timeout */
     private RetryOptions reportCompletionRetryOptions;
 
     private RetryOptions reportFailureRetryOptions;
-
     private Scope metricsScope;
-
     private boolean enableLoggingInReplay;
 
     public Builder() {}
@@ -52,6 +47,7 @@ public Builder(SingleWorkerOptions options) {
       this.identity = options.getIdentity();
       this.dataConverter = options.getDataConverter();
       this.pollerOptions = options.getPollerOptions();
+      this.taskListActivitiesPerSecond = options.getTaskListActivitiesPerSecond();
       this.taskExecutorThreadPoolSize = options.getTaskExecutorThreadPoolSize();
       this.reportCompletionRetryOptions = options.getReportCompletionRetryOptions();
       this.reportFailureRetryOptions = options.getReportFailureRetryOptions();
@@ -89,6 +85,21 @@ public Builder setEnableLoggingInReplay(boolean enableLoggingInReplay) {
       return this;
     }
 
+    public Builder setTaskListActivitiesPerSecond(double taskListActivitiesPerSecond) {
+      this.taskListActivitiesPerSecond = taskListActivitiesPerSecond;
+      return this;
+    }
+
+    public Builder setReportCompletionRetryOptions(RetryOptions reportCompletionRetryOptions) {
+      this.reportCompletionRetryOptions = reportCompletionRetryOptions;
+      return this;
+    }
+
+    public Builder setReportFailureRetryOptions(RetryOptions reportFailureRetryOptions) {
+      this.reportFailureRetryOptions = reportFailureRetryOptions;
+      return this;
+    }
+
     public SingleWorkerOptions build() {
       if (reportCompletionRetryOptions == null) {
         reportCompletionRetryOptions = Retryer.DEFAULT_SERVICE_OPERATION_RETRY_OPTIONS;
@@ -119,44 +130,30 @@ public SingleWorkerOptions build() {
           identity,
           dataConverter,
           taskExecutorThreadPoolSize,
+          taskListActivitiesPerSecond,
           pollerOptions,
           reportCompletionRetryOptions,
           reportFailureRetryOptions,
           metricsScope,
           enableLoggingInReplay);
     }
-
-    public Builder setReportCompletionRetryOptions(RetryOptions reportCompletionRetryOptions) {
-      this.reportCompletionRetryOptions = reportCompletionRetryOptions;
-      return this;
-    }
-
-    public Builder setReportFailureRetryOptions(RetryOptions reportFailureRetryOptions) {
-      this.reportFailureRetryOptions = reportFailureRetryOptions;
-      return this;
-    }
   }
 
   private final String identity;
-
   private final DataConverter dataConverter;
-
   private final int taskExecutorThreadPoolSize;
-
+  private final double taskListActivitiesPerSecond;
   private final PollerOptions pollerOptions;
-
   private final RetryOptions reportCompletionRetryOptions;
-
   private final RetryOptions reportFailureRetryOptions;
-
   private final Scope metricsScope;
-
   private final boolean enableLoggingInReplay;
 
   private SingleWorkerOptions(
       String identity,
       DataConverter dataConverter,
       int taskExecutorThreadPoolSize,
+      double taskListActivitiesPerSecond,
       PollerOptions pollerOptions,
       RetryOptions reportCompletionRetryOptions,
       RetryOptions reportFailureRetryOptions,
@@ -165,6 +162,7 @@ private SingleWorkerOptions(
     this.identity = identity;
     this.dataConverter = dataConverter;
     this.taskExecutorThreadPoolSize = taskExecutorThreadPoolSize;
+    this.taskListActivitiesPerSecond = taskListActivitiesPerSecond;
     this.pollerOptions = pollerOptions;
     this.reportCompletionRetryOptions = reportCompletionRetryOptions;
     this.reportFailureRetryOptions = reportFailureRetryOptions;
@@ -180,22 +178,26 @@ public DataConverter getDataConverter() {
     return dataConverter;
   }
 
-  public int getTaskExecutorThreadPoolSize() {
+  int getTaskExecutorThreadPoolSize() {
     return taskExecutorThreadPoolSize;
   }
 
-  public PollerOptions getPollerOptions() {
+  PollerOptions getPollerOptions() {
     return pollerOptions;
   }
 
-  public RetryOptions getReportCompletionRetryOptions() {
+  RetryOptions getReportCompletionRetryOptions() {
     return reportCompletionRetryOptions;
   }
 
-  public RetryOptions getReportFailureRetryOptions() {
+  RetryOptions getReportFailureRetryOptions() {
     return reportFailureRetryOptions;
   }
 
+  double getTaskListActivitiesPerSecond() {
+    return taskListActivitiesPerSecond;
+  }
+
   public Scope getMetricsScope() {
     return metricsScope;
   }

src/main/java/com/uber/cadence/worker/WorkerOptions.java

@@ -40,6 +40,7 @@ public static final class Builder {
     private int maxConcurrentActivityExecutionSize = 100;
     private int maxConcurrentWorkflowExecutionSize = 50;
     private int maxConcurrentLocalActivityExecutionSize = 100;
+    private double taskListActivitiesPerSecond = 100000;
     private PollerOptions activityPollerOptions;
     private PollerOptions workflowPollerOptions;
     private RetryOptions reportActivityCompletionRetryOptions;
@@ -186,6 +187,19 @@ public Builder setEnableLoggingInReplay(boolean enableLoggingInReplay) {
       return this;
     }
 
+    /**
+     * Optional: Sets the rate limiting on number of activities that can be executed per second.
+     * This is managed by the server and controls activities per second for your entire tasklist.
+     * Notice that the number is represented in double, so that you can set it to less than 1 if
+     * needed. For example, set the number to 0.1 means you want your activity to be executed once
+     * every 10 seconds. This can be used to protect down stream services from flooding. The zero
+     * value of this uses the default value. Default: 100k
+     */
+    public Builder setTaskListActivitiesPerSecond(double taskListActivitiesPerSecond) {
+      this.taskListActivitiesPerSecond = taskListActivitiesPerSecond;
+      return this;
+    }
+
     public WorkerOptions build() {
       if (identity == null) {
         identity = ManagementFactory.getRuntimeMXBean().getName();
@@ -204,6 +218,7 @@ public WorkerOptions build() {
           maxConcurrentActivityExecutionSize,
           maxConcurrentWorkflowExecutionSize,
           maxConcurrentLocalActivityExecutionSize,
+          taskListActivitiesPerSecond,
           activityPollerOptions,
           workflowPollerOptions,
           reportActivityCompletionRetryOptions,
@@ -224,6 +239,7 @@ public WorkerOptions build() {
   private final int maxConcurrentActivityExecutionSize;
   private final int maxConcurrentWorkflowExecutionSize;
   private final int maxConcurrentLocalActivityExecutionSize;
+  private final double taskListActivitiesPerSecond;
   private final PollerOptions activityPollerOptions;
   private final PollerOptions workflowPollerOptions;
   private final RetryOptions reportActivityCompletionRetryOptions;
@@ -243,6 +259,7 @@ private WorkerOptions(
       int maxConcurrentActivityExecutionSize,
       int maxConcurrentWorkflowExecutionSize,
       int maxConcurrentLocalActivityExecutionSize,
+      double taskListActivitiesPerSecond,
       PollerOptions activityPollerOptions,
       PollerOptions workflowPollerOptions,
       RetryOptions reportActivityCompletionRetryOptions,
@@ -260,6 +277,7 @@ private WorkerOptions(
     this.maxConcurrentActivityExecutionSize = maxConcurrentActivityExecutionSize;
     this.maxConcurrentWorkflowExecutionSize = maxConcurrentWorkflowExecutionSize;
     this.maxConcurrentLocalActivityExecutionSize = maxConcurrentLocalActivityExecutionSize;
+    this.taskListActivitiesPerSecond = taskListActivitiesPerSecond;
     this.activityPollerOptions = activityPollerOptions;
     this.workflowPollerOptions = workflowPollerOptions;
     this.reportActivityCompletionRetryOptions = reportActivityCompletionRetryOptions;
@@ -359,6 +377,8 @@ public String toString() {
         + maxConcurrentWorkflowExecutionSize
         + ", maxConcurrentLocalActivityExecutionSize="
         + maxConcurrentLocalActivityExecutionSize
+        + ", taskListActivitiesPerSecond="
+        + taskListActivitiesPerSecond
         + ", activityPollerOptions="
         + activityPollerOptions
         + ", workflowPollerOptions="