1 files changed, 138 insertions, 0 deletions

diff --git a/framework/src/onos/core/store/persistence/src/main/java/org/onosproject/persistence/impl/PersistenceManager.java b/framework/src/onos/core/store/persistence/src/main/java/org/onosproject/persistence/impl/PersistenceManager.java
new file mode 100644
index 00000000..64a8683a
--- /dev/null
+++ b/framework/src/onos/core/store/persistence/src/main/java/org/onosproject/persistence/impl/PersistenceManager.java
@@ -0,0 +1,138 @@
+/*
+ * 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.impl;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Service;
+import org.mapdb.DB;
+import org.mapdb.DBMaker;
+import org.onosproject.persistence.PersistenceService;
+import org.onosproject.persistence.PersistentMapBuilder;
+import org.onosproject.persistence.PersistentSetBuilder;
+import org.slf4j.Logger;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Map;
+import java.util.Set;
+import java.util.Timer;
+import java.util.TimerTask;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Service that maintains local disk backed maps and sets.  This implementation automatically deletes empty structures
+ * on shutdown.
+ */
+@Component(immediate = true)
+@Service
+public class PersistenceManager implements PersistenceService {
+
+    private static final String DATABASE_PATH = "../data/localDB";
+
+    private static final String ENCLOSING_FOLDER = "../data";
+
+    static final String MAP_PREFIX = "map:";
+
+    static final String SET_PREFIX = "set:";
+
+    private final Logger log = getLogger(getClass());
+
+    private DB localDB = null;
+
+    private static final int FLUSH_FREQUENCY_MILLIS = 3000;
+
+    private final Timer timer = new Timer();
+
+    private final CommitTask commitTask = new CommitTask();
+
+    @Activate
+    public void activate() {
+        Path dbPath = Paths.get(DATABASE_PATH);
+        Path dbFolderPath = Paths.get(ENCLOSING_FOLDER);
+        //Make sure the directory exists, if it does not, make it.
+        if (!dbFolderPath.toFile().isDirectory()) {
+            log.info("The specified folder location for the database did not exist and will be created.");
+            try {
+                Files.createDirectories(dbFolderPath);
+            } catch (IOException e) {
+                log.error("Could not create the required folder for the database.");
+                throw new PersistenceException("Database folder could not be created.");
+            }
+        }
+        //Notify if the database file does not exist.
+        boolean dbFound = Files.exists(dbPath);
+        if (!dbFound) {
+            log.info("The database file could not be located, a new database will be constructed.");
+
+        } else {
+            log.info("A previous database file has been found.");
+        }
+        localDB = DBMaker.newFileDB(dbPath.toFile())
+                .asyncWriteEnable()
+                .closeOnJvmShutdown()
+                .make();
+        timer.schedule(commitTask, FLUSH_FREQUENCY_MILLIS, FLUSH_FREQUENCY_MILLIS);
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        for (Map.Entry<String, Object> entry : localDB.getAll().entrySet()) {
+            String key = entry.getKey();
+            Object value = entry.getValue();
+                //This is a map implementation to be handled as such
+            if (value instanceof Map) {
+                Map asMap = (Map) value;
+                if (asMap.isEmpty()) {
+                    //the map is empty and may be deleted
+                    localDB.delete(key);
+                }
+                //This is a set implementation and can be handled as such
+            } else if (value instanceof Set) {
+                Set asSet = (Set) value;
+                if (asSet.isEmpty()) {
+                    //the set is empty and may be deleted
+                    localDB.delete(key);
+                }
+            }
+        }
+        localDB.commit();
+        localDB.close();
+        log.info("Stopped");
+    }
+
+    public <K, V> PersistentMapBuilder<K, V> persistentMapBuilder() {
+        return new DefaultPersistentMapBuilder<>(localDB);
+    }
+
+    public <E> PersistentSetBuilder<E> persistentSetBuilder() {
+        return new DefaultPersistentSetBuilder<>(localDB);
+    }
+
+    private class CommitTask extends TimerTask {
+
+        @Override
+        public void run() {
+            localDB.commit();
+        }
+    }
+}
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