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author | dgrogan@chromium.org <dgrogan@chromium.org@62dab493-f737-651d-591e-8d6aee1b9529> | 2011-04-19 23:11:15 +0000 |
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committer | dgrogan@chromium.org <dgrogan@chromium.org@62dab493-f737-651d-591e-8d6aee1b9529> | 2011-04-19 23:11:15 +0000 |
commit | 69c6d38342a1fab5f7f2921aa2e9c0e60ba90e35 (patch) | |
tree | bea96813c653d9e32277cb86cb517ddd90d0595c /include/leveldb/write_batch.h | |
parent | b743906eeabc925f3e824d91a9747012bf249e2f (diff) | |
download | leveldb-69c6d38342a1fab5f7f2921aa2e9c0e60ba90e35.tar.gz |
reverting disastrous MOE commit, returning to r21
git-svn-id: https://leveldb.googlecode.com/svn/trunk@23 62dab493-f737-651d-591e-8d6aee1b9529
Diffstat (limited to 'include/leveldb/write_batch.h')
-rw-r--r-- | include/leveldb/write_batch.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/include/leveldb/write_batch.h b/include/leveldb/write_batch.h new file mode 100644 index 0000000..3411952 --- /dev/null +++ b/include/leveldb/write_batch.h @@ -0,0 +1,49 @@ +// 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. +// +// WriteBatch holds a collection of updates to apply atomically to a DB. +// +// The updates are applied in the order in which they are added +// to the WriteBatch. For example, the value of "key" will be "v3" +// after the following batch is written: +// +// batch.Put("key", "v1"); +// batch.Delete("key"); +// batch.Put("key", "v2"); +// batch.Put("key", "v3"); + +#ifndef STORAGE_LEVELDB_INCLUDE_WRITE_BATCH_H_ +#define STORAGE_LEVELDB_INCLUDE_WRITE_BATCH_H_ + +#include <string> + +namespace leveldb { + +class Slice; + +class WriteBatch { + public: + WriteBatch(); + ~WriteBatch(); + + // Store the mapping "key->value" in the database. + void Put(const Slice& key, const Slice& value); + + // If the database contains a mapping for "key", erase it. Else do nothing. + void Delete(const Slice& key); + + // Clear all updates buffered in this batch. + void Clear(); + + private: + friend class WriteBatchInternal; + + std::string rep_; // See comment in write_batch.cc for the format of rep_ + + // Intentionally copyable +}; + +} + +#endif // STORAGE_LEVELDB_INCLUDE_WRITE_BATCH_H_ |