Refactor change: Moved all distributed primitive implementation classes into onos-core-primitives bundle
Change-Id: Icd5dbd4133cb2f21bd403bcd598e6012813e6bfd
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/MapDbPersistentStore.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/MapDbPersistentStore.java
new file mode 100644
index 0000000..2a58992
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/MapDbPersistentStore.java
@@ -0,0 +1,103 @@
+/*
+ * 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.store.primitives.impl;
+
+import org.mapdb.DB;
+import org.mapdb.DBMaker;
+import org.mapdb.Hasher;
+import org.mapdb.Serializer;
+import org.onosproject.store.serializers.KryoSerializer;
+
+import java.io.File;
+import java.util.Map;
+import java.util.concurrent.ExecutorService;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * MapDB based implementation of a persistent store.
+ */
+class MapDbPersistentStore<K, V> implements PersistentStore<K, V> {
+
+ private final ExecutorService executor;
+ private final KryoSerializer serializer;
+
+ private final DB database;
+
+ private final Map<byte[], byte[]> items;
+
+ /**
+ * Creates a new MapDB based persistent store.
+ *
+ * @param filename filename of the database on disk
+ * @param executor executor to use for tasks that write to the disk
+ * @param serializer serializer for keys and values
+ */
+ MapDbPersistentStore(String filename, ExecutorService executor,
+ KryoSerializer serializer) {
+ this.executor = checkNotNull(executor);
+ this.serializer = checkNotNull(serializer);
+
+ File databaseFile = new File(filename);
+
+ database = DBMaker.newFileDB(databaseFile).make();
+
+ items = database.createHashMap("items")
+ .keySerializer(Serializer.BYTE_ARRAY)
+ .valueSerializer(Serializer.BYTE_ARRAY)
+ .hasher(Hasher.BYTE_ARRAY)
+ .makeOrGet();
+ }
+
+ @Override
+ public void readInto(Map<K, MapValue<V>> items) {
+ this.items.forEach((keyBytes, valueBytes) ->
+ items.put(serializer.decode(keyBytes),
+ serializer.decode(valueBytes)));
+ }
+
+ @Override
+ public void update(K key, MapValue<V> value) {
+ executor.submit(() -> updateInternal(key, value));
+ }
+
+ @Override
+ public void remove(K key) {
+ executor.submit(() -> removeInternal(key));
+ }
+
+ private void updateInternal(K key, MapValue<V> newValue) {
+ byte[] keyBytes = serializer.encode(key);
+
+ items.compute(keyBytes, (k, existingBytes) -> {
+ MapValue<V> existing = existingBytes == null ? null :
+ serializer.decode(existingBytes);
+ if (existing == null || newValue.isNewerThan(existing)) {
+ return serializer.encode(newValue);
+ } else {
+ return existingBytes;
+ }
+ });
+ database.commit();
+ }
+
+ private void removeInternal(K key) {
+ byte[] keyBytes = serializer.encode(key);
+ items.remove(keyBytes);
+ database.commit();
+ }
+}
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