Class: Grimoire::Solver
- Includes:
- Bogo::Memoization
- Defined in:
- lib/grimoire/solver.rb
Overview
Requirement solver
Constant Summary collapse
- MAX_GENERATION_LOOPS =
Ceiling for number of loops allowed during path generation
100000
Instance Attribute Summary collapse
-
#world ⇒ System
readonly
Subset of full system based on requirements.
Instance Method Summary collapse
-
#build_world(deps = nil, my_world = nil, root = nil) ⇒ Object
Build the world required for the solver (the subset of the entire system required by the requirements).
-
#generate! ⇒ Bogo::PriorityQueue<Path>
Generate valid constraint paths.
-
#initialize(*_) ⇒ Solver
constructor
A new instance of Solver.
-
#populate_queue(p_queue, units) ⇒ Bogo::PriorityQueue
Populate queue with units.
- #queues ⇒ Smash<{Unit#name:Bogo::PriorityQueue}>
-
#reset_queue(name) ⇒ self
Repopulate the given queue.
-
#resolve(dep, given = nil, current = []) ⇒ Array<Unit>
Resolve path for a given dependency.
-
#score_unit(unit, score) ⇒ Numeric
Provide score for given unit.
-
#unit_for(dep) ⇒ Unit
Provide Unit acceptable for given dependency.
Methods inherited from Utility
Constructor Details
Instance Attribute Details
#world ⇒ System (readonly)
Returns subset of full system based on requirements.
19 20 21 |
# File 'lib/grimoire/solver.rb', line 19 def world @world end |
Instance Method Details
#build_world(deps = nil, my_world = nil, root = nil) ⇒ Object
Build the world required for the solver (the subset of the entire system required by the requirements)
36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 |
# File 'lib/grimoire/solver.rb', line 36 def build_world(deps=nil, my_world=nil, root = nil) deps = requirement.requirements unless deps my_world = world unless my_world root = system unless root deps.each do |dep| units = root.subset(dep.name, dep.requirement) sha = Digest::SHA256.hexdigest(MultiJson.dump(units)) if(@log.include?(sha)) debug "Units checksum already added to world. Skipping. (`#{sha}`)" next end debug "Logging units checksum for world addition. (`#{sha}`)" @log.push(sha) units.each do |unit| build_world(unit.dependencies, my_world, root) end debug "Units added to world: #{MultiJson.dump(units.map{|u| {u.name => u.version} })}" my_world.add_unit(units) end end |
#generate! ⇒ Bogo::PriorityQueue<Path>
Generate valid constraint paths
181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 |
# File 'lib/grimoire/solver.rb', line 181 def generate! if(requirements.requirements.empty?) raise ArgumentError.new 'No cookbook constraints provided within Batali file!' end custom_unit = Unit.new( :name => '~_SOLVER_UNIT_~', :version => '1.0.0', :dependencies => requirements.requirements ) count = 0 debug "Solver Unit: #{MultiJson.dump(custom_unit)}" debug{ "Solver world context of unit system: #{world.inspect}" } results = Bogo::PriorityQueue.new begin until(count >= result_limit) result = resolve(nil, custom_unit) results.push(Path.new(:units => result.slice(1, result.size)), count) count += 1 end rescue Error::UnitUnavailable => e debug "Failed to unit: #{e}" count = nil end if(results.empty?) raise Error::NoSolution.new("Failed to generate valid path for requirements: `#{custom_unit.dependencies}`") else results end end |
#populate_queue(p_queue, units) ⇒ Bogo::PriorityQueue
Populate queue with units
75 76 77 78 79 80 81 82 |
# File 'lib/grimoire/solver.rb', line 75 def populate_queue(p_queue, units) i = 0 units = units.map do |unit| [unit, score_unit(unit, i += 1)] end p_queue.multi_push(units) p_queue end |
#queues ⇒ Smash<{Unit#name:Bogo::PriorityQueue}>
58 59 60 61 62 63 64 65 66 67 68 |
# File 'lib/grimoire/solver.rb', line 58 def queues memoize(:queues) do Smash[ world.units.map do |name, items| queue = Bogo::PriorityQueue.new populate_queue(queue, items) [name, queue] end ] end end |
#reset_queue(name) ⇒ self
Repopulate the given queue
101 102 103 104 105 106 107 108 |
# File 'lib/grimoire/solver.rb', line 101 def reset_queue(name) queue = populate_queue( Bogo::PriorityQueue.new, world.units[name] ) queues[name] = queue self end |
#resolve(dep, given = nil, current = []) ⇒ Array<Unit>
Resolve path for a given dependency
138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 |
# File 'lib/grimoire/solver.rb', line 138 def resolve(dep, given=nil, current=[]) unit = given || unit_for(dep) if(unit.dependencies.empty?) [unit] else deps = [unit] begin unit.dependencies.map do |u_dep| existing = (current + deps).detect{|d| d.name == u_dep.name} if(existing) if(u_dep.requirement.satisfied_by?(existing.version)) next else deps.delete(existing) reset_queue(u_dep.name) unless given end else reset_queue(u_dep.name) unless given end deps += resolve(u_dep, nil, current + deps) deps.compact! u_dep end.compact.map do |u_dep| # validator existing = deps.detect{|d| d.name == u_dep.name} if(existing) unless(u_dep.requirement.satisfied_by?(existing.version)) deps.delete(existing) reset_queue(u_dep.name) raise Error::ResolutionPathInvalid.new("Unit <#{existing.inspect}> does not satisfy <#{u_dep.inspect}>") end end end rescue Error::ResolutionPathInvalid => e debug "Resolution path deadend: #{e} (trying new path)" retry end deps.uniq end end |
#score_unit(unit, score) ⇒ Numeric
Provide score for given unit
89 90 91 92 93 94 95 |
# File 'lib/grimoire/solver.rb', line 89 def score_unit(unit, score) if(score_keeper) score_keeper.score_for(unit) || score else score end end |
#unit_for(dep) ⇒ Unit
Provide Unit acceptable for given dependency
115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 |
# File 'lib/grimoire/solver.rb', line 115 def unit_for(dep) unit = nil if(queues[dep.name].nil?) raise KeyError.new "No valid units for requested name found within system! (`#{dep.name}`)" end until(unit || queues[dep.name].empty?) unit = queues[dep.name].pop unit = nil unless dep.requirement.satisfied_by?(unit.version) end unless(unit) error = Error::UnitUnavailable.new("Failed to locate valid unit for: #{dep.inspect}") error.unit_name = dep.name raise error end unit end |