Move AbstractHookQueue into Java

src/main/groovy/com/github/lookout/whoas/AbstractHookQueue.groovy

@@ -1,42 +0,0 @@
-package com.github.lookout.whoas
-
-
-/**
- * Interface defining how 'HookQueue' providers should behave
- *
- * This allows for different queueing implementations behind whoas
- */
-abstract class AbstractHookQueue {
-    protected Boolean started = false
-
-    void start() {
-        if (started) {
-            throw new IllegalStateException()
-        }
-        started = true
-    }
-
-    void stop() {
-        if (!started) {
-            throw new IllegalStateException()
-            return
-        }
-        started = false
-    }
-
-    /**
-     * Return the size of the queue, may not be implemented by some providers
-     * in which case it will return -1
-     */
-    abstract int getSize()
-
-    /**
-     *
-     */
-    abstract void pop(QueueAction action) throws Exception
-
-    /**
-     *
-     */
-    abstract Boolean push(HookRequest request)
-}

src/main/groovy/com/github/lookout/whoas/AbstractHookQueue.java

@@ -0,0 +1,40 @@
+package com.github.lookout.whoas;
+
+/**
+ * Interface defining how 'HookQueue' providers should behave
+ *
+ * This allows for different queueing implementations behind whoas
+ */
+public abstract class AbstractHookQueue {
+    protected Boolean started = false;
+
+    public void start() {
+        if (started) {
+            throw new IllegalStateException();
+        }
+        started = true;
+    }
+
+    public void stop() {
+        if (!started) {
+            throw new IllegalStateException();
+        }
+        started = false;
+    }
+
+    /**
+     * Return the size of the queue, may not be implemented by some providers
+     * in which case it will return -1
+     */
+    public abstract int getSize();
+
+    /**
+     *
+     */
+    public abstract void pop(QueueAction action) throws Exception;
+
+    /**
+     *
+     */
+    public abstract Boolean push(HookRequest request);
+}