--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/net/borgac/clusterrpc/client/OutgoingFilter.java	Sat Sep 24 16:47:46 2016 +0200
@@ -0,0 +1,26 @@
+package net.borgac.clusterrpc.client;
+
+/**
+ * OutgoingFilters are used to influence the behavior of outgoing RPCs.
+ *
+ * An outgoing RPC is given to the first filter, which can modify the request;
+ * after doing its work, it gives the request to the next filter down the stack
+ * until the final SendFilter is encountered, which sends the request.
+ *
+ * After a response has been received, it goes up through the stack of filters,
+ * which then can modify or act on the response (for example, retry a failed
+ * request or log something).
+ *
+ * @author lbo
+ */
+public interface OutgoingFilter {
+
+    /**
+     * Set the filter that this filter will call.
+     *
+     * @param inner
+     */
+    void setInner(OutgoingFilter inner);
+
+    public Response go(Request request);
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/net/borgac/clusterrpc/client/Request.java	Sat Sep 24 16:47:46 2016 +0200
@@ -0,0 +1,16 @@
+package net.borgac.clusterrpc.client;
+
+import proto.Rpc;
+
+/**
+ * An RPC request issued by a client application.
+ *
+ * It goes through the stack of filters before being sent off to the server.
+ *
+ * @author lbo
+ */
+public class Request {
+
+    private Rpc.RPCRequest.Builder rpcRequest;
+
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/net/borgac/clusterrpc/client/Response.java	Sat Sep 24 16:47:46 2016 +0200
@@ -0,0 +1,13 @@
+package net.borgac.clusterrpc.client;
+
+import proto.Rpc;
+
+/**
+ * A response from the remote server, bubbling back up the filter stack.
+ *
+ * @author lbo
+ */
+public class Response {
+
+    Rpc.RPCResponse.Builder rpcResponse;
+}