diff --git a/src/conf.rs b/src/conf.rs
index c3195de..c74cfa8 100644
--- a/src/conf.rs
+++ b/src/conf.rs
@@ -1,20 +1,79 @@
 // Config module
 
-pub struct DAGconfig {
+use libconsensus::errors::{Error, Error::AtMaxVecCapacity, Result};
+use libconsensus::ConsensusConfiguration;
+use os_pipe::PipeWriter;
+use std::sync::mpsc::{Receiver, Sender, TryRecvError};
+
+pub struct DAGconfig<D> {
     pub(crate) inner_port: u16,
     pub(crate) service_port: u16,
     pub(crate) callback_timeout: u64,
     // heartbeat duration in milliseconds
     pub(crate) heartbeat: u64,
+    callback_pool: Vec<fn(data: D) -> bool>,
+    channel_pool: Vec<Sender<D>>,
+    pipe_pool: Vec<PipeWriter>,
+    quit_rx: Option<Receiver<()>>,
 }
 
-impl Default for DAGconfig {
-    fn default() -> Self {
+impl<Data> DAGconfig<Data> {
+    pub fn set_quit_rx(&mut self, rx: Receiver<()>) {
+        self.quit_rx = Some(rx);
+    }
+    pub fn check_quit(&mut self) -> bool {
+        match &self.quit_rx {
+            None => return false,
+            Some(ch) => match ch.try_recv() {
+                Ok(_) | Err(TryRecvError::Disconnected) => return true,
+                Err(TryRecvError::Empty) => return false,
+            },
+        }
+    }
+}
+
+impl<Data> ConsensusConfiguration<Data> for DAGconfig<Data> {
+    fn new() -> Self {
         return DAGconfig {
             inner_port: 9000,
             service_port: 12000,
             callback_timeout: 100,
             heartbeat: 1000,
+            callback_pool: Vec::with_capacity(1),
+            channel_pool: Vec::with_capacity(1),
+            pipe_pool: Vec::with_capacity(1),
+            quit_rx: None,
         };
     }
+
+    fn register_channel(&mut self, sender: Sender<Data>) -> Result<()> {
+        // Vec::push() panics when number of elements overflows `usize`
+        if self.channel_pool.len() == std::usize::MAX {
+            return Err(AtMaxVecCapacity);
+        }
+        self.channel_pool.push(sender);
+        Ok(())
+    }
+
+    fn register_os_pipe(&mut self, sender: PipeWriter) -> Result<()> {
+        // Vec::push() panics when number of elements overflows `usize`
+        if self.pipe_pool.len() == std::usize::MAX {
+            return Err(AtMaxVecCapacity);
+        }
+        self.pipe_pool.push(sender);
+        Ok(())
+    }
+
+    fn register_callback(&mut self, callback: fn(data: Data) -> bool) -> Result<()> {
+        // Vec::push() panics when number of elements overflows `usize`
+        if self.callback_pool.len() == std::usize::MAX {
+            return Err(AtMaxVecCapacity);
+        }
+        self.callback_pool.push(callback);
+        Ok(())
+    }
+
+    fn set_callback_timeout(&mut self, timeout: u64) {
+        self.callback_timeout = timeout;
+    }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 42a354c..e162f74 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -19,55 +19,29 @@ use std::time::Duration;
 
 // DAG node structure
 pub struct DAG<T> {
-    conf: DAGconfig,
+    conf: DAGconfig<T>,
     tx_pool: Vec<T>,
     internal_tx_pool: Vec<InternalTransaction>,
-    callback_pool: Vec<fn(data: T) -> bool>,
-    channel_pool: Vec<Sender<T>>,
-    pipe_pool: Vec<PipeWriter>,
-    quit_rx: Receiver<()>,
     quit_tx: Sender<()>,
     lamport_time: LamportTime,
     current_frame: Frame,
     last_finalised_frame: Option<Frame>,
 }
 
-impl<D> Default for DAG<D> {
-    fn default() -> DAG<D> {
-        let (tx, rx) = mpsc::channel();
-        DAG {
-            conf: DAGconfig::default(),
-            tx_pool: Vec::with_capacity(1),
-            internal_tx_pool: Vec::with_capacity(1),
-            callback_pool: Vec::with_capacity(1),
-            channel_pool: Vec::with_capacity(1),
-            pipe_pool: Vec::with_capacity(1),
-            quit_rx: rx,
-            quit_tx: tx,
-            lamport_time: 0,
-            current_frame: 0,
-            last_finalised_frame: None,
-        }
-    }
-}
-
 impl<D> Consensus for DAG<D>
 where
     D: std::convert::AsRef<u8>,
 {
-    type Configuration = DAGconfig;
+    type Configuration = DAGconfig<D>;
     type Data = D;
 
-    fn new(cfg: DAGconfig) -> DAG<D> {
+    fn new(mut cfg: DAGconfig<D>) -> DAG<D> {
         let (tx, rx) = mpsc::channel();
+        cfg.set_quit_rx(rx);
         return DAG {
             conf: cfg,
             tx_pool: Vec::with_capacity(1),
             internal_tx_pool: Vec::with_capacity(1),
-            callback_pool: Vec::with_capacity(1),
-            channel_pool: Vec::with_capacity(1),
-            pipe_pool: Vec::with_capacity(1),
-            quit_rx: rx,
             quit_tx: tx,
             lamport_time: 0,
             current_frame: 0,
@@ -83,13 +57,10 @@ where
         // DAG0 procedure A loop
         loop {
             // check if shutdown() has been called
-            match self.quit_rx.try_recv() {
-                Ok(_) | Err(TryRecvError::Disconnected) => {
-                    // terminating
-                    // FIXME: need to be implemented
-                    break;
-                }
-                Err(TryRecvError::Empty) => {}
+            if self.conf.check_quit() {
+                // terminating
+                // FIXME: need to be implemented
+                break;
             }
 
             // wait until hearbeat interval expires
@@ -112,37 +83,6 @@ where
         self.tx_pool.push(data);
         true
     }
-
-    fn register_callback(&mut self, callback: fn(data: Self::Data) -> bool) -> bool {
-        // Vec::push() panics when number of elements overflows `usize`
-        if self.callback_pool.len() == std::usize::MAX {
-            return false;
-        }
-        self.callback_pool.push(callback);
-        true
-    }
-
-    fn set_callback_timeout(&mut self, timeout: u64) {
-        self.conf.callback_timeout = timeout;
-    }
-
-    fn register_channel(&mut self, sender: Sender<Self::Data>) -> bool {
-        // Vec::push() panics when number of elements overflows `usize`
-        if self.channel_pool.len() == std::usize::MAX {
-            return false;
-        }
-        self.channel_pool.push(sender);
-        true
-    }
-
-    fn register_os_pipe(&mut self, sender: PipeWriter) -> bool {
-        // Vec::push() panics when number of elements overflows `usize`
-        if self.pipe_pool.len() == std::usize::MAX {
-            return false;
-        }
-        self.pipe_pool.push(sender);
-        true
-    }
 }
 
 impl<D> DAG<D>