Add MetaInfoManager API, remove MetaQueryStatistic entity bean, refactor query execution stats collection

src/main/java/com/avaje/ebean/bean/ObjectGraphOrigin.java

@@ -14,17 +14,20 @@ import java.io.Serializable;
  */
 public final class ObjectGraphOrigin implements Serializable {
 
-  private static final long serialVersionUID = 410937765287968707L;
+  private static final long serialVersionUID = 410937765287968708L;
 
   private final CallStack callStack;
 
-  private final String key;
-
   private final String beanType;
 
+  private final int queryHash;
+
+  private final String key;
+
   public ObjectGraphOrigin(int queryHash, CallStack callStack, String beanType) {
     this.callStack = callStack;
     this.beanType = beanType;
+    this.queryHash = queryHash;
     this.key = callStack.getOriginKey(queryHash);
   }
 
@@ -58,4 +61,24 @@ public final class ObjectGraphOrigin implements Serializable {
     return key + " " + beanType + " " + callStack.getFirstStackTraceElement();
   }
 
+  public int hashCode() {
+    int hc = 31 * callStack.hashCode();
+    hc = 31 * hc + beanType.hashCode();
+    hc = 31 * hc + queryHash;
+    return hc;
+  }
+  
+  public boolean equals(Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (!(obj instanceof ObjectGraphOrigin)) {
+      return false;
+    }
+    
+    ObjectGraphOrigin e = (ObjectGraphOrigin) obj;
+    return e.queryHash == queryHash 
+        && e.beanType.equals(beanType) 
+        && e.callStack.equals(callStack);
+  }
 }