diff --git a/limit.go b/limit.go
index 0034bdd..8d3bedc 100644
--- a/limit.go
+++ b/limit.go
@@ -2,6 +2,8 @@ package rcmgr
 
 import (
 	"github.com/libp2p/go-libp2p-core/network"
+	"github.com/libp2p/go-libp2p-core/peer"
+	"github.com/libp2p/go-libp2p-core/protocol"
 )
 
 type Limit interface {
@@ -10,3 +12,13 @@ type Limit interface {
 	GetConnLimit(network.Direction) int
 	GetFDLimit() int
 }
+
+type Limiter interface {
+	GetSystemLimits() Limit
+	GetTransientLimits() Limit
+	GetServiceLimits(svc string) Limit
+	GetProtocolLimits(proto protocol.ID) Limit
+	GetPeerLimits(p peer.ID) Limit
+	GetStreamLimits(p peer.ID) Limit
+	GetConnLimits() Limit
+}
diff --git a/rcmgr.go b/rcmgr.go
index 96c3a5b..faf1a3c 100644
--- a/rcmgr.go
+++ b/rcmgr.go
@@ -2,6 +2,7 @@ package rcmgr
 
 import (
 	"fmt"
+	"sync"
 
 	"github.com/libp2p/go-libp2p-core/network"
 	"github.com/libp2p/go-libp2p-core/peer"
@@ -9,10 +10,19 @@ import (
 )
 
 type ResourceManager struct {
+	limits Limiter
+
 	system    *SystemScope
 	transient *TransientScope
+
+	mx    sync.Mutex
+	svc   map[string]*ServiceScope
+	proto map[protocol.ID]*ProtocolScope
+	peer  map[peer.ID]*PeerScope
 }
 
+var _ network.ResourceManager = (*ResourceManager)(nil)
+
 type SystemScope struct {
 	*ResourceScope
 }
@@ -83,33 +93,67 @@ type StreamScope struct {
 
 var _ network.StreamScope = (*StreamScope)(nil)
 
+func (r *ResourceManager) GetSystem() network.ResourceScope {
+	return r.system
+}
+
+func (r *ResourceManager) GetTransient() network.ResourceScope {
+	return r.transient
+}
+
+func (r *ResourceManager) GetService(srv string) network.ServiceScope {
+	return r.getServiceScope(srv)
+}
+
+func (r *ResourceManager) GetProtocol(proto protocol.ID) network.ProtocolScope {
+	return r.getProtocolScope(proto)
+}
+
+func (r *ResourceManager) GetPeer(p peer.ID) network.PeerScope {
+	return r.getPeerScope(p)
+}
+
 func (r *ResourceManager) getProtocolScope(proto protocol.ID) *ProtocolScope {
-	// TODO
-	return nil
+	r.mx.Lock()
+	defer r.mx.Unlock()
+
+	s, ok := r.proto[proto]
+	if !ok {
+		s = NewProtocolScope(proto, r.limits.GetProtocolLimits(proto), r.system)
+		r.proto[proto] = s
+	}
+
+	return s
 }
 
 func (r *ResourceManager) getServiceScope(svc string) *ServiceScope {
-	// TODO
-	return nil
+	r.mx.Lock()
+	defer r.mx.Unlock()
+
+	s, ok := r.svc[svc]
+	if !ok {
+		s = NewServiceScope(svc, r.limits.GetServiceLimits(svc), r.system)
+		r.svc[svc] = s
+	}
+
+	return s
 }
 
 func (r *ResourceManager) getPeerScope(p peer.ID) *PeerScope {
-	// TODO
-	return nil
-}
+	r.mx.Lock()
+	defer r.mx.Unlock()
 
-func (r *ResourceManager) getConnLimit() Limit {
-	// TODO
-	return nil
-}
+	s, ok := r.peer[p]
+	if !ok {
+		s = NewPeerScope(p, r.limits.GetPeerLimits(p), r)
+		r.peer[p] = s
+	}
 
-func (r *ResourceManager) getStreamLimit(p peer.ID) Limit {
-	// TODO
-	return nil
+	return s
 }
 
 func (r *ResourceManager) OpenConnection(dir network.Direction, usefd bool) (network.ConnectionScope, error) {
-	conn := NewConnectionScope(dir, usefd, r.getConnLimit(), r)
+	conn := NewConnectionScope(dir, usefd, r.limits.GetConnLimits(), r)
 
 	if err := conn.AddConn(dir); err != nil {
 		return nil, err
@@ -125,6 +169,11 @@ func (r *ResourceManager) OpenConnection(dir network.Direction, usefd bool) (net
 	return conn, nil
 }
 
+func (r *ResourceManager) Close() error {
+	// TODO
+	return nil
+}
+
 func NewSystemScope(limit Limit) *SystemScope {
 	return &SystemScope{
 		ResourceScope: NewResourceScope(limit, nil),
@@ -199,7 +248,7 @@ func (s *PeerScope) Peer() peer.ID {
 }
 
 func (s *PeerScope) OpenStream(dir network.Direction) (network.StreamScope, error) {
-	stream := NewStreamScope(dir, s.rcmgr.getStreamLimit(s.peer), s)
+	stream := NewStreamScope(dir, s.rcmgr.limits.GetStreamLimits(s.peer), s)
 	err := stream.AddStream(dir)
 	if err != nil {
 		return nil, err