leveldb::WriteBatch Class Reference

#include <write_batch.h>

Classes
class	Handler

Public Member Functions
	WriteBatch ()
	~WriteBatch ()
void	Put (const Slice &key, const Slice &value)
void	Delete (const Slice &key)
void	Clear ()
Status	Iterate (Handler *handler) const

Private Attributes
std::string	rep_

Friends
class	WriteBatchInternal

Detailed Description

Definition at line 31 of file write_batch.h.

Constructor & Destructor Documentation

WriteBatch()

leveldb::WriteBatch::WriteBatch

(

)

Definition at line 29 of file write_batch.cc.

                       {
  Clear();
}

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~WriteBatch()

leveldb::WriteBatch::~WriteBatch

(

)

Definition at line 33 of file write_batch.cc.

{ }

Member Function Documentation

Clear()

void leveldb::WriteBatch::Clear

(

)

Definition at line 37 of file write_batch.cc.

                       {
  rep_.clear();
  rep_.resize(kHeader);
}

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Delete()

void leveldb::WriteBatch::Delete

(

const Slice &

key

)

Definition at line 105 of file write_batch.cc.

                                        {
  WriteBatchInternal::SetCount(this, WriteBatchInternal::Count(this) + 1);
  rep_.push_back(static_cast<char>(kTypeDeletion));
  PutLengthPrefixedSlice(&rep_, key);
}

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Iterate()

Status leveldb::WriteBatch::Iterate

(

Handler *

handler

)

const

Definition at line 42 of file write_batch.cc.

                                                 {
  Slice input(rep_);
  if (input.size() < kHeader) {
    return Status::Corruption("malformed WriteBatch (too small)");
  }

  input.remove_prefix(kHeader);
  Slice key, value;
  int found = 0;
  while (!input.empty()) {
    found++;
    char tag = input[0];
    input.remove_prefix(1);
    switch (tag) {
      case kTypeValue:
        if (GetLengthPrefixedSlice(&input, &key) &&
            GetLengthPrefixedSlice(&input, &value)) {
          handler->Put(key, value);
        } else {
          return Status::Corruption("bad WriteBatch Put");
        }
        break;
      case kTypeDeletion:
        if (GetLengthPrefixedSlice(&input, &key)) {
          handler->Delete(key);
        } else {
          return Status::Corruption("bad WriteBatch Delete");
        }
        break;
      default:
        return Status::Corruption("unknown WriteBatch tag");
    }
  }
  if (found != WriteBatchInternal::Count(this)) {
    return Status::Corruption("WriteBatch has wrong count");
  } else {
    return Status::OK();
  }
}

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Put()

void leveldb::WriteBatch::Put	(	const Slice &	key,
		const Slice &	value
	)

Definition at line 98 of file write_batch.cc.

                                                         {
  WriteBatchInternal::SetCount(this, WriteBatchInternal::Count(this) + 1);
  rep_.push_back(static_cast<char>(kTypeValue));
  PutLengthPrefixedSlice(&rep_, key);
  PutLengthPrefixedSlice(&rep_, value);
}

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Friends And Related Function Documentation

WriteBatchInternal

friend class WriteBatchInternal

friend

Definition at line 55 of file write_batch.h.

Member Data Documentation

rep_

std::string leveldb::WriteBatch::rep_

private

Definition at line 57 of file write_batch.h.

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The documentation for this class was generated from the following files:

• include/leveldb/write_batch.h
• db/write_batch.cc