[CORD-1614] Refactor DHCP relay app
Change-Id: Id4a281526aa5469abe5732e5d2d42d34074907e9
diff --git a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/api/DhcpRelayService.java b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/api/DhcpRelayService.java
new file mode 100644
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+++ b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/api/DhcpRelayService.java
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+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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.dhcprelay.api;
+
+import org.onlab.packet.MacAddress;
+import org.onosproject.dhcprelay.store.DhcpRecord;
+import org.onosproject.net.HostId;
+
+import java.util.Collection;
+import java.util.Optional;
+
+public interface DhcpRelayService {
+ /**
+ * Gets DHCP record for specific host id (mac + vlan).
+ *
+ * @param hostId the id of host
+ * @return the DHCP record of the host
+ */
+ Optional<DhcpRecord> getDhcpRecord(HostId hostId);
+
+ /**
+ * Gets all DHCP records from store.
+ *
+ * @return all DHCP records from store
+ */
+ Collection<DhcpRecord> getDhcpRecords();
+
+ /**
+ * Gets mac address of DHCP server.
+ *
+ * @return the mac address of DHCP server; empty if not exist
+ */
+ Optional<MacAddress> getDhcpServerMacAddress();
+}