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NCBI C++ ToolKit: include/util/cache/icache.hpp Source File

timeout,

max_timeout = 0) = 0;

time_to_live = 0,

&

) = 0;

buf_size) = 0;

&

) = 0;

time_to_live = 0,

&

) = 0;

&

) = 0;

&

) = 0;

(time_t access_timeout) = 0;

time_t access_timeout) = 0;

CPluginManager_DllResolver * operator()(void)

Template function to create dll resolver for interface.

Service class for DLLs resolution.

definition of a Culling tree

BLOB cache read/write/maintenance interface.

ETimeStampFlags ETimeStampPolicy

virtual bool IsOpen() const =0

virtual EKeepVersions GetVersionRetention() const =0

Get version retention.

EKeepVersions

If to keep already cached versions of the BLOB when storing another version of it (not necessarily a ...

@ eDropOlder

Delete the earlier (than the one being stored) versions of the BLOB.

@ eDropAll

Delete all versions of the BLOB, even those which are newer than the one being stored.

@ eKeepAll

Do not delete other versions of cache entries.

virtual void SetVersionRetention(EKeepVersions policy)=0

Set version retention policy.

virtual size_t GetSize(const string &key, TBlobVersion version, const string &subkey)=0

Check if BLOB exists, return BLOB size.

virtual IReader * GetReadStream(const string &key, const string &subkey, TBlobVersion *version, EBlobVersionValidity *validity)=0

Request the latest version of a BLOB.

virtual void GetBlobOwner(const string &key, TBlobVersion version, const string &subkey, string *owner)=0

Retrieve BLOB owner.

virtual void Remove(const string &key, TBlobVersion version, const string &subkey)=0

Remove specific cache entry.

virtual TFlags GetFlags()=0

Retrieve the effective combination of flags from the underlying storage.

int TFlags

Bitwise OR of "EFlags" flags.

virtual IWriter * GetWriteStream(const string &key, TBlobVersion version, const string &subkey, unsigned int time_to_live=0, const string &owner=kEmptyStr)=0

Return sequential stream interface to write BLOB data.

TPluginManagerParamTree TCacheParams

Key values to search for a cache with given params.

virtual TTimeStampFlags GetTimeStampPolicy() const =0

Get timestamp policy.

virtual void Purge(const string &key, const string &subkey, time_t access_timeout)=0

Delete BLOBs with access time older than specified.

virtual bool HasBlobs(const string &key, const string &subkey)=0

Check if any BLOB exists (any version)

virtual string GetCacheName(void) const =0

virtual void Purge(time_t access_timeout)=0

Delete all BLOBs older than specified.

virtual void SetTimeStampPolicy(TTimeStampFlags policy, unsigned int timeout, unsigned int max_timeout=0)=0

Set timestamp update policy.

EBlobVersionValidity EBlobValidity

Backward-compatibility typedef.

virtual void SetFlags(TFlags flags)=0

Pass flags to the underlying storage.

virtual time_t GetAccessTime(const string &key, TBlobVersion version, const string &subkey)=0

Return last access time for the specified cache entry.

virtual bool Read(const string &key, TBlobVersion version, const string &subkey, void *buf, size_t buf_size)=0

Fetch the BLOB.

virtual void GetBlobAccess(const string &key, TBlobVersion version, const string &subkey, SBlobAccessDescr *blob_descr)=0

Get BLOB access using BlobAccessDescr.

EBlobVersionValidity

BLOB version existence and validity – from the point of view of the underlying cache implementation.

@ eExpired

Validity of the BLOB version cannot be confirmed.

@ eCurrent

The returned BLOB's version is considered valid.

@ eValid

Synonym for eCurrent.

ETimeStampFlags

ICache keeps timestamps of every cache entry.

@ fTimeStampOnCreate

Cache element is created with a certain timestamp (default)

@ fTimeStampOnRead

Timestamp is updated every on every access (read or write)

@ fExpireLeastFrequentlyUsed

Expire objects older than a certain time frame Example: If object is not accessed within a week it is...

@ fTrackSubKey

Timestamp full key-subkey pair.

@ fPurgeOnStartup

Expired objects should be deleted on cache mount (Open)

@ fCheckExpirationAlways

Expiration timeout is checked on any access to cache element.

@ fNoTimeStamp

Timestamp management disabled.

virtual void Store(const string &key, TBlobVersion version, const string &subkey, const void *data, size_t size, unsigned int time_to_live=0, const string &owner=kEmptyStr)=0

Add or replace BLOB.

EFlags

Flags for the underlying storage.

@ fBestReliability

Usually, it's not a problem if something fails to get cached sometimes.

@ fBestPerformance

The storage to try to get to the best possible overall performance, even if it means sacrificing some...

virtual bool SameCacheParams(const TCacheParams *params) const =0

int TTimeStampFlags

Holds a bitwise OR of "ETimeStampFlags".

virtual int GetTimeout() const =0

Get expiration timeout.

virtual void SetBlobVersionAsCurrent(const string &key, const string &subkey, TBlobVersion version)=0

Set current valid version for a BLOB.

virtual IReader * GetReadStream(const string &key, TBlobVersion version, const string &subkey)=0

Return sequential stream interface to read BLOB data.

A very basic data-read interface.

A very basic data-write interface.

Abstract reader-writer interface classes.

virtual void SetDllNamePrefix(const string &prefix)

Set DLL file name prefix.

#define END_NCBI_SCOPE

End previously defined NCBI scope.

#define BEGIN_NCBI_SCOPE

Define ncbi namespace.

NCBI_DECLARE_INTERFACE_VERSION(ICache, "xcache", 4, 0, 0)

const string version

version string

const struct ncbi::grid::netcache::search::fields::SIZE size

const struct ncbi::grid::netcache::search::fields::KEY key

const struct ncbi::grid::netcache::search::fields::SUBKEY subkey

Helper classes and templates to implement plugins.

unsigned maximum_age

Set to a non-zero value to return a version not older than the specified value.

unsigned actual_age

If `maximum_age` is not zero, GetBlobAccess() will set this field to the actual blob version age upon...

unique_ptr< IReader > reader

EBlobVersionValidity current_version_validity

If `return_current_version` is set, the `current_version_validity` field will contain the validity of...

bool return_current_version_supported

If TRUE, the ICache instance supports return_current_version.

TBlobVersion current_version

If `return_current_version` is set, the current version number of the blob is stored in the `current_...

SBlobAccessDescr(char *buf_=0, size_t buf_size_=0)

bool return_current_version

If TRUE, the `version` argument of GetBlobAccess() will be ignored and the `current_version` and `cur...

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