reverting disastrous MOE commit, returning to r21

git-svn-id: https://leveldb.googlecode.com/svn/trunk@23 62dab493-f737-651d-591e-8d6aee1b9529

1 files changed, 50 insertions, 0 deletions

diff --git a/db/table_cache.h b/db/table_cache.h
new file mode 100644
index 0000000..5376194
--- /dev/null
+++ b/db/table_cache.h
@@ -0,0 +1,50 @@
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+//
+// Thread-safe (provides internal synchronization)
+
+#ifndef STORAGE_LEVELDB_DB_TABLE_CACHE_H_
+#define STORAGE_LEVELDB_DB_TABLE_CACHE_H_
+
+#include <string>
+#include <stdint.h>
+#include "db/dbformat.h"
+#include "leveldb/cache.h"
+#include "leveldb/table.h"
+#include "port/port.h"
+
+namespace leveldb {
+
+class Env;
+
+class TableCache {
+ public:
+  TableCache(const std::string& dbname, const Options* options, int entries);
+  ~TableCache();
+
+  // Return an iterator for the specified file number (the corresponding
+  // file length must be exactly "file_size" bytes).  If "tableptr" is
+  // non-NULL, also sets "*tableptr" to point to the Table object
+  // underlying the returned iterator, or NULL if no Table object underlies
+  // the returned iterator.  The returned "*tableptr" object is owned by
+  // the cache and should not be deleted, and is valid for as long as the
+  // returned iterator is live.
+  Iterator* NewIterator(const ReadOptions& options,
+                        uint64_t file_number,
+                        uint64_t file_size,
+                        Table** tableptr = NULL);
+
+  // Evict any entry for the specified file number
+  void Evict(uint64_t file_number);
+
+ private:
+  Env* const env_;
+  const std::string dbname_;
+  const Options* options_;
+  Cache* cache_;
+};
+
+}
+
+#endif  // STORAGE_LEVELDB_DB_TABLE_CACHE_H_