Index: drools-compiler/src/main/resources/META-INF/drools.default.packagebuilder.conf
===================================================================
--- drools-compiler/src/main/resources/META-INF/drools.default.packagebuilder.conf	(revision 14156)
+++ drools-compiler/src/main/resources/META-INF/drools.default.packagebuilder.conf	(working copy)
@@ -10,3 +10,5 @@
 drools.accumulate.function.min = org.drools.base.accumulators.MinAccumulateFunction
 drools.accumulate.function.count = org.drools.base.accumulators.CountAccumulateFunction
 drools.accumulate.function.sum = org.drools.base.accumulators.SumAccumulateFunction
+drools.accumulate.function.countInteger = org.drools.base.accumulators.CountIntegerAccumulateFunction
+drools.accumulate.function.sumInteger = org.drools.base.accumulators.SumIntegerAccumulateFunction
Index: drools-core/src/main/java/org/drools/base/accumulators/CountIntegerAccumulateFunction.java
===================================================================
--- drools-core/src/main/java/org/drools/base/accumulators/CountIntegerAccumulateFunction.java	(revision 0)
+++ drools-core/src/main/java/org/drools/base/accumulators/CountIntegerAccumulateFunction.java	(revision 0)
@@ -0,0 +1,63 @@
+package org.drools.base.accumulators;
+
+/**
+ * An implementation of an accumulator capable of counting occurences
+ *
+ * @author etirelli
+ *
+ */
+public class CountIntegerAccumulateFunction implements AccumulateFunction {
+
+    protected static class CountData {
+        public int count = 0;
+    }
+
+    /* (non-Javadoc)
+     * @see org.drools.base.accumulators.AccumulateFunction#createContext()
+     */
+    public Object createContext() {
+        return new CountIntegerAccumulateFunction.CountData();
+    }
+
+    /* (non-Javadoc)
+     * @see org.drools.base.accumulators.AccumulateFunction#init(java.lang.Object)
+     */
+    public void init(Object context) throws Exception {
+        CountIntegerAccumulateFunction.CountData data = (CountIntegerAccumulateFunction.CountData) context;
+        data.count = 0;
+    }
+
+    /* (non-Javadoc)
+     * @see org.drools.base.accumulators.AccumulateFunction#accumulate(java.lang.Object, java.lang.Object)
+     */
+    public void accumulate(Object context,
+                           Object value) {
+        CountIntegerAccumulateFunction.CountData data = (CountIntegerAccumulateFunction.CountData) context;
+        data.count++;
+    }
+
+    /* (non-Javadoc)
+     * @see org.drools.base.accumulators.AccumulateFunction#reverse(java.lang.Object, java.lang.Object)
+     */
+    public void reverse(Object context,
+                        Object value) throws Exception {
+        CountIntegerAccumulateFunction.CountData data = (CountIntegerAccumulateFunction.CountData) context;
+        data.count--;
+    }
+
+    /* (non-Javadoc)
+     * @see org.drools.base.accumulators.AccumulateFunction#getResult(java.lang.Object)
+     */
+    public Object getResult(Object context) throws Exception {
+        CountIntegerAccumulateFunction.CountData data = (CountIntegerAccumulateFunction.CountData) context;
+        return Integer.valueOf( data.count );
+    }
+
+    /* (non-Javadoc)
+     * @see org.drools.base.accumulators.AccumulateFunction#supportsReverse()
+     */
+    public boolean supportsReverse() {
+        return true;
+    }
+
+}
Index: drools-core/src/main/java/org/drools/base/accumulators/SumIntegerAccumulateFunction.java
===================================================================
--- drools-core/src/main/java/org/drools/base/accumulators/SumIntegerAccumulateFunction.java	(revision 0)
+++ drools-core/src/main/java/org/drools/base/accumulators/SumIntegerAccumulateFunction.java	(revision 0)
@@ -0,0 +1,63 @@
+package org.drools.base.accumulators;
+
+/**
+ * An implementation of an accumulator capable of calculating sum of values
+ *
+ * @author etirelli
+ *
+ */
+public class SumIntegerAccumulateFunction implements AccumulateFunction {
+
+    protected static class SumData {
+        public int total = 0;
+    }
+
+    /* (non-Javadoc)
+     * @see org.drools.base.accumulators.AccumulateFunction#createContext()
+     */
+    public Object createContext() {
+        return new SumIntegerAccumulateFunction.SumData();
+    }
+
+    /* (non-Javadoc)
+     * @see org.drools.base.accumulators.AccumulateFunction#init(java.lang.Object)
+     */
+    public void init(Object context) throws Exception {
+        SumIntegerAccumulateFunction.SumData data = (SumIntegerAccumulateFunction.SumData) context;
+        data.total = 0;
+    }
+
+    /* (non-Javadoc)
+     * @see org.drools.base.accumulators.AccumulateFunction#accumulate(java.lang.Object, java.lang.Object)
+     */
+    public void accumulate(Object context,
+                           Object value) {
+        SumIntegerAccumulateFunction.SumData data = (SumIntegerAccumulateFunction.SumData) context;
+        data.total += ((Number) value).intValue();
+    }
+
+    /* (non-Javadoc)
+     * @see org.drools.base.accumulators.AccumulateFunction#reverse(java.lang.Object, java.lang.Object)
+     */
+    public void reverse(Object context,
+                        Object value) throws Exception {
+        SumIntegerAccumulateFunction.SumData data = (SumIntegerAccumulateFunction.SumData) context;
+        data.total -= ((Number) value).intValue();
+    }
+
+    /* (non-Javadoc)
+     * @see org.drools.base.accumulators.AccumulateFunction#getResult(java.lang.Object)
+     */
+    public Object getResult(Object context) throws Exception {
+        SumIntegerAccumulateFunction.SumData data = (SumIntegerAccumulateFunction.SumData) context;
+        return Integer.valueOf( data.total );
+    }
+
+    /* (non-Javadoc)
+     * @see org.drools.base.accumulators.AccumulateFunction#supportsReverse()
+     */
+    public boolean supportsReverse() {
+        return true;
+    }
+
+}