Merge pull request Netflix#775 from mattrjacobs/add-counters-for-hyst…

…rix-quantities

Add HystrixCounters methods to return number of commands/threadpools/groups

hystrix-core/src/main/java/com/netflix/hystrix/HystrixCommandGroupKey.java

@@ -69,5 +69,9 @@ public String name() {
             }
 
         }
+
+        /* package-private */ static int getGroupCount() {
+            return intern.size();
+        }
     }
 }

hystrix-core/src/main/java/com/netflix/hystrix/HystrixCommandKey.java

@@ -67,6 +67,10 @@ public String name() {
             }
 
         }
+
+        /* package-private */ static int getCommandCount() {
+            return intern.size();
+        }
     }
 
 }

hystrix-core/src/main/java/com/netflix/hystrix/HystrixCounters.java

@@ -2,6 +2,10 @@
 
 import java.util.concurrent.atomic.AtomicInteger;
 
+/**
+ * Class with global statistics on Hystrix runtime behavior.
+ * All of the data available via this class is static and scoped at the JVM level
+ */
 public class HystrixCounters {
     private static final AtomicInteger concurrentThreadsExecuting = new AtomicInteger(0);
 
@@ -13,7 +17,35 @@ public class HystrixCounters {
         concurrentThreadsExecuting.decrementAndGet();
     }
 
+    /**
+     * Return the number of currently-executing Hystrix threads
+     * @return number of currently-executing Hystrix threads
+     */
     public static int getGlobalConcurrentThreadsExecuting() {
         return concurrentThreadsExecuting.get();
     }
+
+    /**
+     * Return the number of unique {@link HystrixCommand}s that have been registered
+     * @return number of unique {@link HystrixCommand}s that have been registered
+     */
+    public static int getCommandCount() {
+        return HystrixCommandKey.Factory.getCommandCount();
+    }
+
+    /**
+     * Return the number of unique {@link HystrixThreadPool}s that have been registered
+     * @return number of unique {@link HystrixThreadPool}s that have been registered
+     */
+    public static int getThreadPoolCount() {
+        return HystrixThreadPoolKey.Factory.getThreadPoolCount();
+    }
+
+    /**
+     * Return the number of unique {@link HystrixCommandGroupKey}s that have been registered
+     * @return number of unique {@link HystrixCommandGroupKey}s that have been registered
+     */
+    public static int getGroupCount() {
+        return HystrixCommandGroupKey.Factory.getGroupCount();
+    }
 }

hystrix-core/src/main/java/com/netflix/hystrix/HystrixThreadPoolKey.java

@@ -69,5 +69,9 @@ public String name() {
             }
 
         }
+
+        /* package-private */ static int getThreadPoolCount() {
+            return intern.size();
+        }
     }
 }