diff --git a/providers/of/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/OpenFlowRuleProvider.java b/providers/of/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/OpenFlowRuleProvider.java
index 38ba59b..9eed3c9 100644
--- a/providers/of/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/OpenFlowRuleProvider.java
+++ b/providers/of/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/OpenFlowRuleProvider.java
@@ -2,58 +2,29 @@
 
 import static org.slf4j.LoggerFactory.getLogger;
 
-import java.util.Collections;
-import java.util.LinkedList;
-import java.util.List;
-
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Deactivate;
 import org.apache.felix.scr.annotations.Reference;
 import org.apache.felix.scr.annotations.ReferenceCardinality;
 import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.net.flow.DefaultFlowRule;
 import org.onlab.onos.net.flow.FlowEntry;
 import org.onlab.onos.net.flow.FlowRule;
 import org.onlab.onos.net.flow.FlowRuleProvider;
 import org.onlab.onos.net.flow.FlowRuleProviderRegistry;
 import org.onlab.onos.net.flow.FlowRuleProviderService;
-import org.onlab.onos.net.flow.criteria.Criteria.EthCriterion;
-import org.onlab.onos.net.flow.criteria.Criteria.EthTypeCriterion;
-import org.onlab.onos.net.flow.criteria.Criteria.IPCriterion;
-import org.onlab.onos.net.flow.criteria.Criteria.IPProtocolCriterion;
-import org.onlab.onos.net.flow.criteria.Criteria.PortCriterion;
-import org.onlab.onos.net.flow.criteria.Criteria.VlanIdCriterion;
-import org.onlab.onos.net.flow.criteria.Criteria.VlanPcpCriterion;
-import org.onlab.onos.net.flow.criteria.Criterion;
-import org.onlab.onos.net.flow.instructions.Instruction;
-import org.onlab.onos.net.flow.instructions.Instructions.OutputInstruction;
-import org.onlab.onos.net.flow.instructions.L2ModificationInstruction;
-import org.onlab.onos.net.flow.instructions.L2ModificationInstruction.ModEtherInstruction;
-import org.onlab.onos.net.flow.instructions.L2ModificationInstruction.ModVlanIdInstruction;
-import org.onlab.onos.net.flow.instructions.L2ModificationInstruction.ModVlanPcpInstruction;
-import org.onlab.onos.net.flow.instructions.L3ModificationInstruction;
-import org.onlab.onos.net.flow.instructions.L3ModificationInstruction.ModIPInstruction;
 import org.onlab.onos.net.provider.AbstractProvider;
 import org.onlab.onos.net.provider.ProviderId;
 import org.onlab.onos.net.topology.TopologyService;
 import org.onlab.onos.of.controller.Dpid;
 import org.onlab.onos.of.controller.OpenFlowController;
+import org.onlab.onos.of.controller.OpenFlowEventListener;
 import org.onlab.onos.of.controller.OpenFlowSwitch;
-import org.projectfloodlight.openflow.protocol.OFFactory;
-import org.projectfloodlight.openflow.protocol.OFFlowMod;
-import org.projectfloodlight.openflow.protocol.OFFlowModFlags;
-import org.projectfloodlight.openflow.protocol.action.OFAction;
-import org.projectfloodlight.openflow.protocol.match.Match;
-import org.projectfloodlight.openflow.protocol.match.MatchField;
-import org.projectfloodlight.openflow.types.EthType;
-import org.projectfloodlight.openflow.types.IPv4Address;
-import org.projectfloodlight.openflow.types.IpProtocol;
-import org.projectfloodlight.openflow.types.MacAddress;
-import org.projectfloodlight.openflow.types.OFBufferId;
-import org.projectfloodlight.openflow.types.OFPort;
-import org.projectfloodlight.openflow.types.OFVlanVidMatch;
-import org.projectfloodlight.openflow.types.VlanPcp;
-import org.projectfloodlight.openflow.types.VlanVid;
+import org.onlab.onos.of.controller.OpenFlowSwitchListener;
+import org.projectfloodlight.openflow.protocol.OFFlowRemoved;
+import org.projectfloodlight.openflow.protocol.OFMessage;
+import org.projectfloodlight.openflow.protocol.OFPortStatus;
 import org.slf4j.Logger;
 
 /**
@@ -105,168 +76,10 @@
 
     private void applyRule(FlowRule flowRule) {
         OpenFlowSwitch sw = controller.getSwitch(Dpid.dpid(flowRule.deviceId().uri()));
-        Match match = buildMatch(flowRule.selector().criteria(), sw.factory());
-        List<OFAction> actions =
-                buildActions(flowRule.treatment().instructions(), sw.factory());
-
-        //TODO: what to do without bufferid? do we assume that there will be a pktout as well?
-        OFFlowMod fm = sw.factory().buildFlowModify()
-                .setBufferId(OFBufferId.NO_BUFFER)
-                .setActions(actions)
-                .setMatch(match)
-                .setFlags(Collections.singleton(OFFlowModFlags.SEND_FLOW_REM))
-                .setIdleTimeout(10)
-                .setHardTimeout(10)
-                .setPriority(flowRule.priority())
-                .build();
-        sw.sendMsg(fm);
+        sw.sendMsg(new FlowModBuilder(flowRule, sw.factory()).buildFlowMod());
     }
 
-    private List<OFAction> buildActions(List<Instruction> instructions, OFFactory factory) {
-        List<OFAction> acts = new LinkedList<>();
-        for (Instruction i : instructions) {
-            switch (i.type()) {
-            case DROP:
-                log.warn("Saw drop action; assigning drop action");
-                return new LinkedList<>();
-            case L2MODIFICATION:
-                acts.add(buildL2Modification(i, factory));
-            case L3MODIFICATION:
-                acts.add(buildL3Modification(i, factory));
-            case OUTPUT:
-                OutputInstruction out = (OutputInstruction) i;
-                acts.add(factory.actions().buildOutput().setPort(
-                        OFPort.of((int) out.port().toLong())).build());
-                break;
-            case GROUP:
-            default:
-                log.warn("Instruction type {} not yet implemented.", i.type());
-            }
-        }
 
-        return acts;
-    }
-
-    private OFAction buildL3Modification(Instruction i, OFFactory factory) {
-        L3ModificationInstruction l3m = (L3ModificationInstruction) i;
-        ModIPInstruction ip;
-        switch (l3m.subtype()) {
-        case L3_DST:
-            ip = (ModIPInstruction) i;
-            return factory.actions().setNwDst(IPv4Address.of(ip.ip().toInt()));
-        case L3_SRC:
-            ip = (ModIPInstruction) i;
-            return factory.actions().setNwSrc(IPv4Address.of(ip.ip().toInt()));
-        default:
-            log.warn("Unimplemented action type {}.", l3m.subtype());
-            break;
-        }
-        return null;
-    }
-
-    private OFAction buildL2Modification(Instruction i, OFFactory factory) {
-        L2ModificationInstruction l2m = (L2ModificationInstruction) i;
-        ModEtherInstruction eth;
-        switch (l2m.subtype()) {
-        case L2_DST:
-            eth = (ModEtherInstruction) l2m;
-            return factory.actions().setDlDst(MacAddress.of(eth.mac().toLong()));
-        case L2_SRC:
-            eth = (ModEtherInstruction) l2m;
-            return factory.actions().setDlSrc(MacAddress.of(eth.mac().toLong()));
-        case VLAN_ID:
-            ModVlanIdInstruction vlanId = (ModVlanIdInstruction) l2m;
-            return factory.actions().setVlanVid(VlanVid.ofVlan(vlanId.vlanId.toShort()));
-        case VLAN_PCP:
-            ModVlanPcpInstruction vlanPcp = (ModVlanPcpInstruction) l2m;
-            return factory.actions().setVlanPcp(VlanPcp.of(vlanPcp.vlanPcp()));
-        default:
-            log.warn("Unimplemented action type {}.", l2m.subtype());
-            break;
-        }
-        return null;
-    }
-
-    private Match buildMatch(List<Criterion> criteria, OFFactory factory) {
-        Match.Builder mBuilder = factory.buildMatch();
-        EthCriterion eth;
-        IPCriterion ip;
-        for (Criterion c : criteria) {
-            switch (c.type()) {
-            case IN_PORT:
-                PortCriterion inport = (PortCriterion) c;
-                mBuilder.setExact(MatchField.IN_PORT, OFPort.of((int) inport.port().toLong()));
-                break;
-            case ETH_SRC:
-                eth = (EthCriterion) c;
-                mBuilder.setExact(MatchField.ETH_SRC, MacAddress.of(eth.mac().toLong()));
-                break;
-            case ETH_DST:
-                eth = (EthCriterion) c;
-                mBuilder.setExact(MatchField.ETH_DST, MacAddress.of(eth.mac().toLong()));
-                break;
-            case ETH_TYPE:
-                EthTypeCriterion ethType = (EthTypeCriterion) c;
-                mBuilder.setExact(MatchField.ETH_TYPE, EthType.of(ethType.ethType()));
-                break;
-            case IPV4_DST:
-                ip = (IPCriterion) c;
-                mBuilder.setExact(MatchField.IPV4_DST, IPv4Address.of(ip.ip().toInt()));
-                break;
-            case IPV4_SRC:
-                ip = (IPCriterion) c;
-                mBuilder.setExact(MatchField.IPV4_SRC, IPv4Address.of(ip.ip().toInt()));
-                break;
-            case IP_PROTO:
-                IPProtocolCriterion p = (IPProtocolCriterion) c;
-                mBuilder.setExact(MatchField.IP_PROTO, IpProtocol.of(p.protocol()));
-                break;
-            case VLAN_PCP:
-                VlanPcpCriterion vpcp = (VlanPcpCriterion) c;
-                mBuilder.setExact(MatchField.VLAN_PCP, VlanPcp.of(vpcp.priority()));
-                break;
-            case VLAN_VID:
-                VlanIdCriterion vid = (VlanIdCriterion) c;
-                mBuilder.setExact(MatchField.VLAN_VID,
-                        OFVlanVidMatch.ofVlanVid(VlanVid.ofVlan(vid.vlanId().toShort())));
-                break;
-            case ARP_OP:
-            case ARP_SHA:
-            case ARP_SPA:
-            case ARP_THA:
-            case ARP_TPA:
-            case ICMPV4_CODE:
-            case ICMPV4_TYPE:
-            case ICMPV6_CODE:
-            case ICMPV6_TYPE:
-            case IN_PHY_PORT:
-            case IPV6_DST:
-            case IPV6_EXTHDR:
-            case IPV6_FLABEL:
-            case IPV6_ND_SLL:
-            case IPV6_ND_TARGET:
-            case IPV6_ND_TLL:
-            case IPV6_SRC:
-            case IP_DSCP:
-            case IP_ECN:
-            case METADATA:
-            case MPLS_BOS:
-            case MPLS_LABEL:
-            case MPLS_TC:
-            case PBB_ISID:
-            case SCTP_DST:
-            case SCTP_SRC:
-            case TCP_DST:
-            case TCP_SRC:
-            case TUNNEL_ID:
-            case UDP_DST:
-            case UDP_SRC:
-            default:
-                log.warn("Action type {} not yet implemented.", c.type());
-            }
-        }
-        return mBuilder.build();
-    }
 
     @Override
     public void removeFlowRule(FlowRule... flowRules) {
@@ -283,6 +96,45 @@
 
     //TODO: InternalFlowRuleProvider listening to stats and error and flowremoved.
     // possibly barriers as well. May not be internal at all...
+    private class InternalFlowProvider
+    implements OpenFlowSwitchListener, OpenFlowEventListener {
+
+
+        @Override
+        public void switchAdded(Dpid dpid) {
+
+
+        }
+
+        @Override
+        public void switchRemoved(Dpid dpid) {
+
+
+        }
+
+        @Override
+        public void portChanged(Dpid dpid, OFPortStatus status) {
+            //TODO: Decide whether to evict flows internal store.
+        }
+
+        @Override
+        public void handleMessage(Dpid dpid, OFMessage msg) {
+            switch (msg.getType()) {
+            case FLOW_REMOVED:
+                OFFlowRemoved removed = (OFFlowRemoved) msg;
+                FlowRule fr = new DefaultFlowRule(DeviceId.deviceId(Dpid.uri(dpid)), null, null);
+                providerService.flowRemoved(fr);
+                break;
+            case STATS_REPLY:
+            case BARRIER_REPLY:
+            case ERROR:
+            default:
+                log.warn("Unhandled message type: {}", msg.getType());
+            }
+
+        }
+
+    }
 
 
 }