8b5f64881c
After all our recent troubles with DBM I figured I'd benchmark the performance of DBM vs. JSON. At read time (what we care more about) the performance is pretty much identical and JSON is only 1.5x slower at write time. This seems worth it for the reliability increases to avoid messing with unreliable native code.
74 lines
1.7 KiB
Ruby
74 lines
1.7 KiB
Ruby
require "set"
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require "cache_store"
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#
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# `LinkageCacheStore` provides methods to fetch and mutate linkage-specific data used
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# by the `brew linkage` command
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#
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class LinkageCacheStore < CacheStore
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# @param [String] keg_path
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# @param [CacheStoreDatabase] database
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# @return [nil]
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def initialize(keg_path, database)
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@keg_path = keg_path
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super(database)
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end
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# Returns `true` if the database has any value for the current `keg_path`
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#
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# @return [Boolean]
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def keg_exists?
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!database.get(@keg_path).nil?
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end
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# Inserts dylib-related information into the cache if it does not exist or
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# updates data into the linkage cache if it does exist
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#
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# @param [Hash] hash_values: hash containing KVPs of { :type => Hash }
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# @return [nil]
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def update!(hash_values)
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hash_values.each_key do |type|
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next if HASH_LINKAGE_TYPES.include?(type)
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raise TypeError, <<~EOS
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Can't update types that are not defined for the linkage store
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EOS
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end
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database.set @keg_path, hash_values
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end
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# @param [Symbol] the type to fetch from the `LinkageCacheStore`
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# @raise [TypeError] error if the type is not in `HASH_LINKAGE_TYPES`
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# @return [Hash]
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def fetch_type(type)
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unless HASH_LINKAGE_TYPES.include?(type)
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raise TypeError, <<~EOS
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Can't fetch types that are not defined for the linkage store
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EOS
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end
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return {} unless keg_exists?
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fetch_hash_values(type)
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end
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# @return [nil]
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def flush_cache!
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database.delete(@keg_path)
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end
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private
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HASH_LINKAGE_TYPES = [:keg_files_dylibs].freeze
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# @param [Symbol] type
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# @return [Hash]
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def fetch_hash_values(type)
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keg_cache = database.get(@keg_path)
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return {} unless keg_cache
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keg_cache[type.to_s]
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end
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end
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