def load(cls, io):
chunkfile = ChunkFile.open(io)
_, logindexheader, logindexio = ChunkIO.from_name(chunkfile, LOG_INDEX_NAME)
_, logbufferheader, logbufferio = ChunkIO.from_name(chunkfile, LOG_BUFFER_NAME)
logindex_reader = LogIndexReader(logindexio, logindexheader.length/LogIndexEntrySerializer.SERIALIZED_LENGTH)
logindex = SerializedLogIndex.load(logindex_reader)
logbuffer_reader = LogBufferReader(logbufferio, logbufferheader.length)
logbuffer = LogBuffer.load(logindex, logbuffer_reader)
txlog = TransactionLog(chunkfile, logindex, logbuffer)
outpointchunk, outpointchunkheader = chunkfile.get_chunk(OUTPOINTS_NAME)
outpoint_io = TransactionalIO(txlog, outpointchunk)
outpoint_reader = OutpointIndexReader(outpoint_io, outpointchunkheader.length)
outpoints = SerializedItemSet.load(outpoint_reader)
return cls(txlog, outpoints)
def test_SerializedLogIndex_recover_ErasesLastUnfinishedTransaction(self):
COUNT = 10
io = IoHandle.using_stringio(COUNT)
reader = LogIndexReader(io, COUNT)
logindex = SerializedLogIndex.new(reader)
logindex.log(LogIndexEntry(LogIndexEntry.BEGIN_TX))
logindex.log(LogIndexEntry(LogIndexEntry.WRITE, 1))
logindex.log(LogIndexEntry(LogIndexEntry.WRITE, 2))
logindex.log(LogIndexEntry(LogIndexEntry.END_TX))
logindex.log(LogIndexEntry(LogIndexEntry.BEGIN_TX))
logindex.log(LogIndexEntry(LogIndexEntry.WRITE, 3))
logindex.log(LogIndexEntry(LogIndexEntry.WRITE, 4))
logindex2 = SerializedLogIndex.load(reader)
logindex2.recover()
self.assertEquals(logindex2.tocommit,
deque([ LogIndexEntry(LogIndexEntry.BEGIN_TX),
LogIndexEntry(LogIndexEntry.WRITE, 1),
LogIndexEntry(LogIndexEntry.WRITE, 2),
LogIndexEntry(LogIndexEntry.END_TX)] ))
def test_SerializedLogIndex_recover_ErasesLastUnfinishedTransaction(self):
COUNT = 10
io = IoHandle.using_stringio(COUNT)
reader = LogIndexReader(io, COUNT)
logindex = SerializedLogIndex.new(reader)
logindex.log(LogIndexEntry(LogIndexEntry.BEGIN_TX))
logindex.log(LogIndexEntry(LogIndexEntry.WRITE, 1))
logindex.log(LogIndexEntry(LogIndexEntry.WRITE, 2))
logindex.log(LogIndexEntry(LogIndexEntry.END_TX))
logindex.log(LogIndexEntry(LogIndexEntry.BEGIN_TX))
logindex.log(LogIndexEntry(LogIndexEntry.WRITE, 3))
logindex.log(LogIndexEntry(LogIndexEntry.WRITE, 4))
logindex2 = SerializedLogIndex.load(reader)
logindex2.recover()
self.assertEquals(
logindex2.tocommit,
deque([
LogIndexEntry(LogIndexEntry.BEGIN_TX),
LogIndexEntry(LogIndexEntry.WRITE, 1),
LogIndexEntry(LogIndexEntry.WRITE, 2),
LogIndexEntry(LogIndexEntry.END_TX)
]))
def load(cls, io):
chunkfile = ChunkFile.open(io)
_, logindexheader, logindexio = ChunkIO.from_name(
chunkfile, LOG_INDEX_NAME)
_, logbufferheader, logbufferio = ChunkIO.from_name(
chunkfile, LOG_BUFFER_NAME)
logindex_reader = LogIndexReader(
logindexio,
logindexheader.length / LogIndexEntrySerializer.SERIALIZED_LENGTH)
logindex = SerializedLogIndex.load(logindex_reader)
logbuffer_reader = LogBufferReader(logbufferio, logbufferheader.length)
logbuffer = LogBuffer.load(logindex, logbuffer_reader)
txlog = TransactionLog(chunkfile, logindex, logbuffer)
outpointchunk, outpointchunkheader = chunkfile.get_chunk(
OUTPOINTS_NAME)
outpoint_io = TransactionalIO(txlog, outpointchunk)
outpoint_reader = OutpointIndexReader(outpoint_io,
outpointchunkheader.length)
outpoints = SerializedItemSet.load(outpoint_reader)
return cls(txlog, outpoints)
