Squashed 'src/rocksdb/' content from commit 457bae6

git-subtree-dir: src/rocksdb
git-subtree-split: 457bae6911

java/org/rocksdb/HashLinkedListMemTableConfig.java

@@ -0,0 +1,52 @@
+package org.rocksdb;
+
+/**
+ * The config for hash linked list memtable representation
+ * Such memtable contains a fix-sized array of buckets, where
+ * each bucket points to a sorted singly-linked
+ * list (or null if the bucket is empty).
+ *
+ * Note that since this mem-table representation relies on the
+ * key prefix, it is required to invoke one of the usePrefixExtractor
+ * functions to specify how to extract key prefix given a key.
+ * If proper prefix-extractor is not set, then RocksDB will
+ * use the default memtable representation (SkipList) instead
+ * and post a warning in the LOG.
+ */
+public class HashLinkedListMemTableConfig extends MemTableConfig {
+  public static final long DEFAULT_BUCKET_COUNT = 50000;
+
+  public HashLinkedListMemTableConfig() {
+    bucketCount_ = DEFAULT_BUCKET_COUNT;
+  }
+
+  /**
+   * Set the number of buckets in the fixed-size array used
+   * in the hash linked-list mem-table.
+   *
+   * @param count the number of hash buckets.
+   * @return the reference to the current HashLinkedListMemTableConfig.
+   */
+  public HashLinkedListMemTableConfig setBucketCount(long count) {
+    bucketCount_ = count;
+    return this;
+  }
+
+  /**
+   * Returns the number of buckets that will be used in the memtable
+   * created based on this config.
+   *
+   * @return the number of buckets
+   */
+  public long bucketCount() {
+    return bucketCount_;
+  }
+
+  @Override protected long newMemTableFactoryHandle() {
+    return newMemTableFactoryHandle(bucketCount_);
+  }
+
+  private native long newMemTableFactoryHandle(long bucketCount);
+
+  private long bucketCount_;
+}