diff --git a/protocols/p4runtime/ctl/src/main/java/org/onosproject/p4runtime/ctl/P4RuntimeControllerImpl.java b/protocols/p4runtime/ctl/src/main/java/org/onosproject/p4runtime/ctl/P4RuntimeControllerImpl.java
new file mode 100644
index 0000000..cd4151c
--- /dev/null
+++ b/protocols/p4runtime/ctl/src/main/java/org/onosproject/p4runtime/ctl/P4RuntimeControllerImpl.java
@@ -0,0 +1,173 @@
+/*
+ * Copyright 2017-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.p4runtime.ctl;
+
+import com.google.common.collect.Maps;
+import io.grpc.ManagedChannel;
+import io.grpc.ManagedChannelBuilder;
+import io.grpc.NameResolverProvider;
+import io.grpc.internal.DnsNameResolverProvider;
+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.apache.felix.scr.annotations.Service;
+import org.onosproject.event.AbstractListenerManager;
+import org.onosproject.grpc.api.GrpcChannelId;
+import org.onosproject.grpc.api.GrpcController;
+import org.onosproject.net.DeviceId;
+import org.onosproject.p4runtime.api.P4RuntimeClient;
+import org.onosproject.p4runtime.api.P4RuntimeController;
+import org.onosproject.p4runtime.api.P4RuntimeEvent;
+import org.onosproject.p4runtime.api.P4RuntimeEventListener;
+import org.slf4j.Logger;
+
+import java.io.IOException;
+import java.util.Map;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static java.lang.String.format;
+import static java.util.concurrent.Executors.newSingleThreadExecutor;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * P4Runtime controller implementation.
+ */
+@Component(immediate = true)
+@Service
+public class P4RuntimeControllerImpl
+        extends AbstractListenerManager<P4RuntimeEvent, P4RuntimeEventListener>
+        implements P4RuntimeController {
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected GrpcController grpcController;
+
+    private final Logger log = getLogger(getClass());
+
+    private final NameResolverProvider nameResolverProvider = new DnsNameResolverProvider();
+    private final Map<DeviceId, P4RuntimeClient> clients = Maps.newConcurrentMap();
+    private final Map<DeviceId, GrpcChannelId> channelIds = Maps.newConcurrentMap();
+    // TODO: should use a cache to delete unused locks.
+    private final Map<DeviceId, Lock> deviceLocks = Maps.newConcurrentMap();
+
+    @Activate
+    public void activate() {
+        log.info("Started");
+    }
+
+
+    @Deactivate
+    public void deactivate() {
+        grpcController = null;
+        log.info("Stopped");
+    }
+
+
+    @Override
+    public boolean createClient(DeviceId deviceId, int p4DeviceId, ManagedChannelBuilder channelBuilder) {
+        checkNotNull(deviceId);
+        checkNotNull(channelBuilder);
+
+        deviceLocks.putIfAbsent(deviceId, new ReentrantLock());
+        deviceLocks.get(deviceId).lock();
+
+        log.info("Creating client for {} (with internal device id {})...", deviceId, p4DeviceId);
+
+        try {
+            if (clients.containsKey(deviceId)) {
+                throw new IllegalStateException(format("A client already exists for %s", deviceId));
+            } else {
+                return doCreateClient(deviceId, p4DeviceId, channelBuilder);
+            }
+        } finally {
+            deviceLocks.get(deviceId).unlock();
+        }
+    }
+
+    private boolean doCreateClient(DeviceId deviceId, int p4DeviceId, ManagedChannelBuilder channelBuilder) {
+        GrpcChannelId channelId = GrpcChannelId.of(deviceId, "p4runtime");
+
+        // Channel defaults.
+        channelBuilder.nameResolverFactory(nameResolverProvider);
+
+        ManagedChannel channel;
+        try {
+            channel = grpcController.connectChannel(channelId, channelBuilder);
+        } catch (IOException e) {
+            log.warn("Unable to connect to gRPC server of {}: {}", deviceId, e.getMessage());
+            return false;
+        }
+
+        P4RuntimeClient client = new P4RuntimeClientImpl(deviceId, p4DeviceId, channel, this,
+                                                         newSingleThreadExecutor());
+
+        channelIds.put(deviceId, channelId);
+        clients.put(deviceId, client);
+
+        return true;
+    }
+
+    @Override
+    public P4RuntimeClient getClient(DeviceId deviceId) {
+
+        deviceLocks.putIfAbsent(deviceId, new ReentrantLock());
+        deviceLocks.get(deviceId).lock();
+
+        try {
+            return clients.get(deviceId);
+        } finally {
+            deviceLocks.get(deviceId).unlock();
+        }
+    }
+
+    @Override
+    public void removeClient(DeviceId deviceId) {
+
+        deviceLocks.putIfAbsent(deviceId, new ReentrantLock());
+        deviceLocks.get(deviceId).lock();
+
+        try {
+            if (clients.containsKey(deviceId)) {
+                clients.get(deviceId).shutdown();
+                grpcController.disconnectChannel(channelIds.get(deviceId));
+                clients.remove(deviceId);
+            }
+        } finally {
+            deviceLocks.get(deviceId).unlock();
+        }
+    }
+
+    @Override
+    public boolean hasClient(DeviceId deviceId) {
+
+        deviceLocks.putIfAbsent(deviceId, new ReentrantLock());
+        deviceLocks.get(deviceId).lock();
+
+        try {
+            return clients.containsKey(deviceId);
+        } finally {
+            deviceLocks.get(deviceId).unlock();
+        }
+    }
+
+    void postEvent(P4RuntimeEvent event) {
+        post(event);
+    }
+}