Imported Upstream version 1.18

[platform/upstream/leveldb.git] / db / dbformat.h

diff --git a/db/dbformat.h b/db/dbformat.h
index 044717d..ea897b1 100644 (file)
--- a/db/dbformat.h
+++ b/db/dbformat.h
@@ -2,12 +2,13 @@
 // 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.
 
-#ifndef STORAGE_LEVELDB_DB_FORMAT_H_
-#define STORAGE_LEVELDB_DB_FORMAT_H_
+#ifndef STORAGE_LEVELDB_DB_DBFORMAT_H_
+#define STORAGE_LEVELDB_DB_DBFORMAT_H_
 
 #include <stdio.h>
 #include "leveldb/comparator.h"
 #include "leveldb/db.h"
+#include "leveldb/filter_policy.h"
 #include "leveldb/slice.h"
 #include "leveldb/table_builder.h"
 #include "util/coding.h"
@@ -37,6 +38,9 @@ static const int kL0_StopWritesTrigger = 12;
 // space if the same key space is being repeatedly overwritten.
 static const int kMaxMemCompactLevel = 2;
 
+// Approximate gap in bytes between samples of data read during iteration.
+static const int kReadBytesPeriod = 1048576;
+
 }  // namespace config
 
 class InternalKey;
@@ -123,6 +127,17 @@ class InternalKeyComparator : public Comparator {
   int Compare(const InternalKey& a, const InternalKey& b) const;
 };
 
+// Filter policy wrapper that converts from internal keys to user keys
+class InternalFilterPolicy : public FilterPolicy {
+ private:
+  const FilterPolicy* const user_policy_;
+ public:
+  explicit InternalFilterPolicy(const FilterPolicy* p) : user_policy_(p) { }
+  virtual const char* Name() const;
+  virtual void CreateFilter(const Slice* keys, int n, std::string* dst) const;
+  virtual bool KeyMayMatch(const Slice& key, const Slice& filter) const;
+};
+
 // Modules in this directory should keep internal keys wrapped inside
 // the following class instead of plain strings so that we do not
 // incorrectly use string comparisons instead of an InternalKeyComparator.
@@ -212,4 +227,4 @@ inline LookupKey::~LookupKey() {
 
 }  // namespace leveldb
 
-#endif  // STORAGE_LEVELDB_DB_FORMAT_H_
+#endif  // STORAGE_LEVELDB_DB_DBFORMAT_H_