Creating persistence service.
Change-Id: Ib78b4001a24c71b4096e5a2a446dbd5009aa1090
diff --git a/core/api/src/main/java/org/onosproject/persistence/PersistenceService.java b/core/api/src/main/java/org/onosproject/persistence/PersistenceService.java
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+++ b/core/api/src/main/java/org/onosproject/persistence/PersistenceService.java
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+/*
+ * 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.persistence;
+
+/**
+ * Service that allows for the creation of local disk backed map for instance specific values that persist across
+ * restarts. Empty maps and sets are deleted on shutdown.
+ */
+public interface PersistenceService {
+ /**
+ * A builder for the creation of local persistent maps backed by disk.
+ *
+ * @param <K> the type of keys in this map
+ * @param <V> the type of values in this map
+ * @return a persistent map builder
+ */
+ <K, V> PersistentMapBuilder<K, V> persistentMapBuilder();
+
+ /**
+ * A builder for the creation of local persistent sets backed by disk.
+ *
+ * @param <E> the type of the elements
+ * @return a persistent set builder
+ */
+ <E> PersistentSetBuilder<E> persistentSetBuilder();
+}
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diff --git a/core/api/src/main/java/org/onosproject/persistence/PersistentMapBuilder.java b/core/api/src/main/java/org/onosproject/persistence/PersistentMapBuilder.java
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+++ b/core/api/src/main/java/org/onosproject/persistence/PersistentMapBuilder.java
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+/*
+ * 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.persistence;
+
+
+import org.onosproject.store.service.Serializer;
+
+import java.util.Map;
+
+/**
+ * The interface for a persistent map builder for use with mapDB.
+ */
+public interface PersistentMapBuilder<K, V> {
+
+ /**
+ * Sets the name of this map.
+ * @param name the string name of this map
+ * @return a persistent map builder with the name option now set
+ */
+ PersistentMapBuilder<K, V> withName(String name);
+
+ /**
+ * Sets the key serializer to be used to serialize this map, this is a required parameter.
+ * @param serializer the serializer to be used for keys
+ * @return a persistent map builder with the key serializer set
+ */
+ PersistentMapBuilder<K, V> withSerializer(Serializer serializer);
+
+ /**
+ * Validates the map settings and then builds this map in the database. Throws an exception if invalid settings
+ * are found.
+ * @return The map that was created
+ */
+ Map<K, V> build();
+}
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diff --git a/core/api/src/main/java/org/onosproject/persistence/PersistentSetBuilder.java b/core/api/src/main/java/org/onosproject/persistence/PersistentSetBuilder.java
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+++ b/core/api/src/main/java/org/onosproject/persistence/PersistentSetBuilder.java
@@ -0,0 +1,48 @@
+/*
+ * 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.persistence;
+
+import org.onosproject.store.service.Serializer;
+
+import java.util.Set;
+
+/**
+ * The default interface for the persistent set builder for use with mapDB.
+ */
+public interface PersistentSetBuilder<E> {
+
+ /**
+ * Sets the name of this set.
+ * @param name the string name of this set
+ * @return a persistent set builder with the name option now set
+ */
+ PersistentSetBuilder<E> withName(String name);
+
+ /**
+ * Sets the serializer to be used to serialize this set, this is a required parameter.
+ * @param serializer the serializer to be used
+ * @return a persistent set builder with the serializer set
+ */
+ PersistentSetBuilder<E> withSerializer(Serializer serializer);
+
+ /**
+ * Validates the set settings and then builds this map in the database. Throws an exception if invalid settings
+ * are found.
+ * @return The set that was created
+ */
+ Set<E> build();
+}
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