diff --git a/net/api/src/main/java/org/onlab/onos/event/DefaultEventSinkRegistry.java b/net/api/src/main/java/org/onlab/onos/event/DefaultEventSinkRegistry.java
new file mode 100644
index 0000000..1c7fb13
--- /dev/null
+++ b/net/api/src/main/java/org/onlab/onos/event/DefaultEventSinkRegistry.java
@@ -0,0 +1,47 @@
+package org.onlab.onos.event;
+
+import com.google.common.collect.ImmutableSet;
+
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Base implementation of event sink registry.
+ */
+public class DefaultEventSinkRegistry implements EventSinkRegistry {
+
+    private final Map<Class<? extends Event>, EventSink<? extends Event>>
+            sinks = new ConcurrentHashMap<>();
+
+    @Override
+    public <E extends Event> void addSink(Class<E> eventClass, EventSink<E> sink) {
+        checkNotNull(eventClass, "Event class cannot be null");
+        checkNotNull(sink, "Event sink cannot be null");
+        checkArgument(!sinks.containsKey(eventClass),
+                      "Event sink already registered for %s", eventClass.getName());
+        sinks.put(eventClass, sink);
+    }
+
+    @Override
+    public <E extends Event> void removeSink(Class<E> eventClass) {
+        checkNotNull(eventClass, "Event class cannot be null");
+        checkArgument(sinks.remove(eventClass) != null,
+                      "Event sink not registered for %s", eventClass.getName());
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public <E extends Event> EventSink<E> getSink(Class<E> eventClass) {
+        // TODO: add implicit registration of descendant classes
+        return (EventSink<E>) sinks.get(eventClass);
+    }
+
+    @Override
+    public Set<Class<? extends Event>> getSinks() {
+        return ImmutableSet.copyOf(sinks.keySet());
+    }
+}