84 lines
2.3 KiB
Ruby
84 lines
2.3 KiB
Ruby
class Keystore < ActiveRecord::Base
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self.primary_key = "key"
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validates_presence_of :key
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def self.get(key)
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self.where(:key => key).first
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end
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def self.value_for(key)
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self.where(:key => key).first.try(:value)
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end
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def self.put(key, value)
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if Keystore.connection.adapter_name == "SQLite"
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Keystore.connection.execute("INSERT OR REPLACE INTO " <<
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"#{Keystore.table_name} (`key`, `value`) VALUES " <<
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"(#{q(key)}, #{q(value)})")
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elsif Keystore.connection.adapter_name =~ /Mysql/
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Keystore.connection.execute("INSERT INTO #{Keystore.table_name} (" +
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"`key`, `value`) VALUES (#{q(key)}, #{q(value)}) ON DUPLICATE KEY " +
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"UPDATE `value` = #{q(value)}")
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else
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kv = self.find_or_create_key_for_update(key, value)
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kv.value = value
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kv.save!
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end
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true
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end
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def self.increment_value_for(key, amount = 1)
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self.incremented_value_for(key, amount)
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end
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def self.incremented_value_for(key, amount = 1)
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Keystore.transaction do
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if Keystore.connection.adapter_name == "SQLite"
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Keystore.connection.execute("INSERT OR IGNORE INTO " <<
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"#{Keystore.table_name} (`key`, `value`) VALUES " <<
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"(#{q(key)}, 0)")
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Keystore.connection.execute("UPDATE #{Keystore.table_name} " <<
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"SET `value` = `value` + #{q(amount)} WHERE `key` = #{q(key)}")
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elsif Keystore.connection.adapter_name =~ /Mysql/
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Keystore.connection.execute("INSERT INTO #{Keystore.table_name} (" +
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"`key`, `value`) VALUES (#{q(key)}, #{q(amount)}) ON DUPLICATE KEY " +
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"UPDATE `value` = `value` + #{q(amount)}")
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else
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kv = self.find_or_create_key_for_update(key, 0)
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kv.value = kv.value.to_i + amount
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kv.save!
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return kv.value
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end
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self.value_for(key)
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end
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end
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def self.find_or_create_key_for_update(key, init = nil)
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loop do
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kv = self.lock(true).where(:key => key).first
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return kv if kv
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begin
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self.create! do |kv|
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kv.key = key
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kv.value = init
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kv.save!
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end
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rescue ActiveRecord::RecordNotUnique
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nil
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end
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end
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end
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def self.decrement_value_for(key, amount = -1)
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self.increment_value_for(key, amount)
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end
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def self.decremented_value_for(key, amount = -1)
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self.incremented_value_for(key, amount)
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end
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end
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