--- /dev/null
+/*
+ * Copyright © 2021 Orange, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.transportpce.pce.gnpy.consumer;
+
+import org.opendaylight.yang.gen.v1.gnpy.gnpy.api.rev190103.GnpyApi;
+import org.opendaylight.yang.gen.v1.gnpy.path.rev200909.Result;
+
+public interface GnpyConsumer {
+
+ /**
+ * Check if api is available or not.
+ * @return true os available, false otherwise.
+ */
+ boolean isAvailable();
+
+ /**
+ * Path computation request.
+ * @param request GnpyApi.
+ * @return Result the result of pat computation.
+ */
+ Result computePaths(GnpyApi request);
+
+}