diff --git a/playground/java/src/org/broadinstitute/sting/indels/DiscardingPileReceiver.java b/playground/java/src/org/broadinstitute/sting/indels/DiscardingPileReceiver.java
new file mode 100644
index 000000000..1a7a1047f
--- /dev/null
+++ b/playground/java/src/org/broadinstitute/sting/indels/DiscardingPileReceiver.java
@@ -0,0 +1,19 @@
+package org.broadinstitute.sting.indels;
+
+import net.sf.samtools.SAMRecord;
+
+import java.util.Collection;
+
+/**
+ * Created by IntelliJ IDEA.
+ * User: asivache
+ * Date: Mar 20, 2009
+ * Time: 12:55:01 AM
+ * To change this template use File | Settings | File Templates.
+ */
+public class DiscardingPileReceiver implements RecordPileReceiver {
+    @Override
+    public void receive(Collection<SAMRecord> c) {
+        return ; // do nothing, discard the pile.
+    }
+}
diff --git a/playground/java/src/org/broadinstitute/sting/indels/DiscardingReceiver.java b/playground/java/src/org/broadinstitute/sting/indels/DiscardingReceiver.java
new file mode 100644
index 000000000..981585ac6
--- /dev/null
+++ b/playground/java/src/org/broadinstitute/sting/indels/DiscardingReceiver.java
@@ -0,0 +1,17 @@
+package org.broadinstitute.sting.indels;
+
+import net.sf.samtools.SAMRecord;
+
+/**
+ * Created by IntelliJ IDEA.
+ * User: asivache
+ * Date: Mar 20, 2009
+ * Time: 12:53:53 AM
+ * To change this template use File | Settings | File Templates.
+ */
+public class DiscardingReceiver implements RecordReceiver {
+    @Override
+    public void receive(SAMRecord r) {
+        return ;// do nothing, discard the record
+    }
+}
diff --git a/playground/java/src/org/broadinstitute/sting/indels/RecordPileReceiver.java b/playground/java/src/org/broadinstitute/sting/indels/RecordPileReceiver.java
new file mode 100644
index 000000000..0853b0438
--- /dev/null
+++ b/playground/java/src/org/broadinstitute/sting/indels/RecordPileReceiver.java
@@ -0,0 +1,22 @@
+package org.broadinstitute.sting.indels;
+
+import net.sf.samtools.SAMRecord;
+
+import java.util.Collection;
+
+/**
+ * Created by IntelliJ IDEA.
+ * User: asivache
+ * Date: Mar 19, 2009
+ * Time: 7:51:47 PM
+ * To change this template use File | Settings | File Templates.
+ */
+
+/** This interface abstracts processing of piles (collections) of SAM records.
+ * Its only receive() method should be called to send a collection of records
+ * to the implementation.
+ */
+
+public interface RecordPileReceiver {
+    public void receive(Collection<SAMRecord> c) ;
+}
diff --git a/playground/java/src/org/broadinstitute/sting/indels/RecordReceiver.java b/playground/java/src/org/broadinstitute/sting/indels/RecordReceiver.java
new file mode 100644
index 000000000..378fe1fe9
--- /dev/null
+++ b/playground/java/src/org/broadinstitute/sting/indels/RecordReceiver.java
@@ -0,0 +1,18 @@
+package org.broadinstitute.sting.indels;
+
+import net.sf.samtools.SAMRecord;
+
+/**
+ * Created by IntelliJ IDEA.
+ * User: asivache
+ * Date: Mar 19, 2009
+ * Time: 7:28:40 PM
+ * To change this template use File | Settings | File Templates.
+ */
+
+/** This interface abstracts processing of SAM records. Its only receive() method should be called to send a record
+ * to the implementation.
+ */
+public interface RecordReceiver {
+    public void receive(SAMRecord r);
+}