Sketching out basis for network configuration subsystem API.
Change-Id: I9d56a8392bd300566fb333607102cc965b2fa66e
diff --git a/exp/api/src/main/java/org/onosproject/exp/net/config/NetworkConfigService.java b/exp/api/src/main/java/org/onosproject/exp/net/config/NetworkConfigService.java
new file mode 100644
index 0000000..3dae379
--- /dev/null
+++ b/exp/api/src/main/java/org/onosproject/exp/net/config/NetworkConfigService.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2015 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.exp.net.config;
+
+import java.util.Set;
+
+/**
+ * Service for tracking network configurations which specify how the discovered
+ * network information should be interpretted and how the network should be
+ * configured.
+ */
+public interface NetworkConfigService {
+
+ /**
+ * Returns the set of subjects for which some configuration is available.
+ *
+ * @param subjectClass subject class
+ * @return set of configured subjects
+ */
+ <T> Set<T> getSubjects(Class<T> subjectClass);
+
+ /**
+ * Returns the set of subjects for which the specified configuration is
+ * available.
+ *
+ * @param subjectClass subject class
+ * @param configClass configuration class
+ * @return set of configured subjects
+ */
+ <T> Set<T> getSubjects(Class<T> subjectClass, Class<Config<T>> configClass);
+
+
+ /**
+ * Returns all configurations for the specified subject.
+ *
+ * @param subject configuration subject
+ * @return set of configurations
+ */
+ <T> Set<Config<T>> getConfigs(T subject);
+
+ /**
+ * Returns the configuration for the specified subject and configuration
+ * class if one is available; null otherwise.
+ *
+ * @param subject configuration subject
+ * @param configClass configuration class
+ * @return configuration or null if one is not available
+ */
+ <T> Config<T> getConfig(T subject, Class<Config<T>> configClass);
+
+}