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/DatabasePartitioner.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/DatabasePartitioner.java
new file mode 100644
index 0000000..f5ccdda
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/DatabasePartitioner.java
@@ -0,0 +1,45 @@
+/*
+ * 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 static com.google.common.base.Preconditions.checkState;
+
+import java.util.List;
+import com.google.common.base.Charsets;
+import com.google.common.collect.ImmutableList;
+import com.google.common.hash.Hashing;
+
+/**
+ * Partitioner for mapping map entries to individual database partitions.
+ * <p>
+ * By default a md5 hash of the hash key (key or map name) is used to pick a
+ * partition.
+ */
+public abstract class DatabasePartitioner implements Partitioner<String> {
+ // Database partitions sorted by their partition name.
+ protected final List<Database> partitions;
+
+ public DatabasePartitioner(List<Database> partitions) {
+ checkState(partitions != null && !partitions.isEmpty(), "Partitions cannot be null or empty");
+ this.partitions = ImmutableList.copyOf(partitions);
+ }
+
+ protected int hash(String key) {
+ return Math.abs(Hashing.md5().newHasher().putBytes(key.getBytes(Charsets.UTF_8)).hash().asInt());
+ }
+
+}