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NCBI C++ ToolKit: include/algo/volume_merge/volume_merge.hpp Source File

(

vector<IMergeVolumeWalker*>& vol_vector,

(GetErrCode())

*

(

* buf_size)

= 0;

Main volume merge algorithm class.

void SetMergeStore(IMergeStore *store, EOwnership own=eTakeOwnership)

Set merge store (destination)

TBufResourcePool & GetBufResourcePool()

Get BLOB buffer pool.

void x_MergeVolume(IMergeVolumeWalker *volume)

void SetVolumes(const vector< IMergeVolumeWalker * > &vol_vector, EOwnership own=eTakeOwnership)

Set merge volumes.

CSimpleBuffer TRawBuffer

Raw BLOB buffer type used for raw information exchange between merge algorithm interfaces Raw buffers...

AutoPtr< IMergeBlob > m_Merger

TBufResourcePool m_BufResourcePool

void Run()

Execute merge process (main merge loop)

vector< size_t > m_MinKeyCandidates

min-key volumes

void x_MergeCandidates()

Merge all discovered min key candidates.

EOwnership m_OwnVolumeVect

CResourcePool< TRawBuffer, CFastMutex > TBufResourcePool

Memory manager for raw buffers to avoid unnecessary reallocations and memory fragmentation.

AutoPtr< IMergeStore > m_Store

unsigned m_MergeKey

key in the merger

void x_EvaluateMinKey(unsigned new_key, size_t volume_idx)

check if volume key is new minimum or equals to old minimum

void SetMergeAccumulator(IMergeBlob *merger, EOwnership own=eTakeOwnership)

Set merge accumulator component.

vector< IMergeVolumeWalker * > m_VolumeVect

void x_ResetMinKey()

Reset min. evaluation.

unsigned m_MinKey

min key value

CResourcePoolGuard< TBufResourcePool > TBufPoolGuard

Buffer pool guard.

Base Merge algorithms exception class.

NCBI_EXCEPTION_DEFAULT(CMerge_Exception, CException)

virtual const char * GetErrCodeString(void) const

Reallocable memory buffer (no memory copy overhead) Mimics vector<>, without the overhead of explicit...

BLOB merge interface, merges one or more BLOBs together.

CMergeVolumes::TBufResourcePool * m_BufResourcePool

void SetResourcePool(CMergeVolumes::TBufResourcePool &res_pool)

Set resource pool for BLOB buffer memory management.

virtual void Reset()=0

Reset merging, forget all the accumulated buffers.

virtual CMergeVolumes::TRawBuffer * GetMergeBuffer()=0

Returns destination (merged) buffer Caller MUST return the buffer to the buffer pool.

virtual void Merge(CMergeVolumes::TRawBuffer *buffer)=0

Merge request Implementation MUST return the buffer to the pool.

Include a standard set of the NCBI C++ Toolkit most basic headers.

@ eTakeOwnership

An object can take ownership of another.

virtual const char * GetErrCodeString(void) const

Get error code interpreted as text.

#define EXCEPTION_VIRTUAL_BASE

Do not use virtual base classes in exception declaration at all, because in this case derived class s...

uint32_t Uint4

4-byte (32-bit) unsigned integer

#define END_NCBI_SCOPE

End previously defined NCBI scope.

#define BEGIN_NCBI_SCOPE

Define ncbi namespace.

enum ENcbiOwnership EOwnership

Ownership relations between objects.

Defines NCBI C++ exception handling.

Miscellaneous common-use basic types and functionality.

Multi-threading – mutexes; rw-locks; semaphore.

virtual EStatus GetStatus() const =0

Get current interface async. status.

@ eNoMoreData

Interface reached the end (EOF)

@ eFailed

Last operation failed and interface cannot recover.

@ eReady

Volume is ready.

@ eNotReady

Last request did not finish yet.

virtual ~IAsyncInterface()

virtual EStatus WaitReady() const =0

Wait until interface is ready (or operation fails) (On failure volume is free to throw an exception)

Interface to store merged BLOBs.

virtual void Close()=0

Close storage (when it ends) Method is responsible for finalization of store procedure,...

virtual IAsyncInterface * QueryIAsync()=0

Get pointer to async.

virtual CMergeVolumes::TRawBuffer * ReadBlob(Uint4 blob_id)=0

Read buffer with the specified blob_id This method is for store update, when we are merging into an e...

virtual void Store(Uint4 blob_id, CMergeVolumes::TRawBuffer *buffer)=0

Store BLOB request This request can be asyncronous caller needs to check status using IAsyncInterface...

virtual bool IsGood() const =0

Return TRUE if storage device is in good shape.

void SetResourcePool(CMergeVolumes::TBufResourcePool &res_pool)

Set resource pool for BLOB buffer memory management.

CMergeVolumes::TBufResourcePool * m_BufResourcePool

Interface to traverse volume for merge.

virtual bool IsEof() const =0

Return TRUE when volume traverse reaches the end.

virtual bool IsGood() const =0

Return TRUE if volume is in good condition (not failed)

virtual void Close()=0

Close volume (when it ends) Method is responsible for finalization of merge procedure (it could be de...

virtual void FetchFirst()=0

Request to start fetching data This request can be asyncronous caller needs to check status using IAs...

virtual ~IMergeVolumeWalker()

virtual Uint4 GetUint4Key() const =0

Get access to the key as unsigned integer (if this type is supported)

virtual void Fetch()=0

Request to get next record This request can be asyncronous caller needs to check status using IAsyncI...

virtual const unsigned char * GetKeyPtr() const =0

Get low level access to the current key buffer.

virtual IAsyncInterface * QueryIAsync()=0

Get pointer to async.

virtual const unsigned char * GetBufferPtr(size_t *buf_size) const =0

Get low level access to the merge BLOB buffer and buffer size (next Fetch call invalidates this point...

virtual void SetRecordMoved()=0

Signals that current record moved to merged storage (volume manager may decide to delete it later) Vo...

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