1 files changed, 41 insertions, 0 deletions
diff --git a/framework/src/onos/core/api/src/main/java/org/onosproject/net/device/DeviceClockService.java b/framework/src/onos/core/api/src/main/java/org/onosproject/net/device/DeviceClockService.java
new file mode 100644
index 00000000..5391999a
--- /dev/null
+++ b/framework/src/onos/core/api/src/main/java/org/onosproject/net/device/DeviceClockService.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2014 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.net.device;
+
+import org.onosproject.net.DeviceId;
+import org.onosproject.store.Timestamp;
+
+/**
+ * Interface for a logical clock service that vends per device timestamps.
+ */
+public interface DeviceClockService {
+
+    /**
+     * Checks if this service can issue Timestamp for specified device.
+     *
+     * @param deviceId device identifier.
+     * @return true if timestamp can be issued for specified device
+     */
+    boolean isTimestampAvailable(DeviceId deviceId);
+
+    /**
+     * Returns a new timestamp for the specified deviceId.
+     *
+     * @param deviceId device identifier.
+     * @return timestamp.
+     */
+    Timestamp getTimestamp(DeviceId deviceId);
+}