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kded
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====
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kded is responsible for creating the sycoca file, i.e. the binary
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cache of servicetypes, mimetypes and services, for a particular user.
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It uses KDirWatch to monitor the directories contain the .desktop files.
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When a file is added/removed, it waits 5 seconds (in case of series of
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updates), and then launches kbuildsycoca.
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kbuildsycoca recreates the sycoca file by:
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* parsing all .desktop files, replacing global ones by local ones (at any
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level of the hierarchy)
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* creating all objects in memory
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* saving everything in the sycoca file (see below for ksycoca internals)
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* clearing all memory
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* notifying the applications that use ksycoca by a DCOP call to the ksycoca
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object (KSycoca::notifyDatabaseChanged()).
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Format of the sycoca database file
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==================================
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List of factories
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| * Factory id, Factory offset
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| * Factory id, Factory offset
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| * ...
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| * 0
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Header
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| * Offer-list offset
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| * Mimetype-patterns index offset (fast patterns)
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| * Mimetype-patterns index offset (other)
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| * Entry size in the mimetype-patterns index ("fast" part)
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For each factory
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| * offset of the dict
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| KSycocaEntries
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| | * entry type
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| | Entry
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| | | entry-dependent information
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| | ...
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| |
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| Dict
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| | * hashtable size
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| | Hash list
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| | | * list of values used to compute a hash key
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| | Hash table
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| | | * id (positive = entry offset)
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| | | * id (negative = - offset in duplicates list )
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| | | * 0 if no entry for that hash value
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| | Table of duplicates
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| | | * entry offset, key
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| | | * entry offset, key
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Offer list
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| * servicetype offset, service offset
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| * servicetype offset, service offset
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| * servicetype offset, service offset
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| * servicetype offset, service offset
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| * 0
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This allows to quickly tqfind services associated with a servicetype.
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It does NOT reflect the user profile, which is stored in profilerc and
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implemented in KServiceTypeProfile.
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Mimetype patterns
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| Fast patterns (fixed size)
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| * Extension (padded to 4 chars), mimetype offset
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| * Extension (padded to 4 chars), mimetype offset
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| * Extension (padded to 4 chars), mimetype offset
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| Other patterns (variable size)
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| * Pattern (ex : *.*gf), mimetype offset
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| * Pattern (ex : Makefile*), mimetype offset
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| * ""
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The first one is designed for a binary search, since entries have a fixed size
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and are sorted by extension.
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The second one (10% of the mimetypes usually) is for a linear search.
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