Class: ApacheCrunch::LogDistribution

Inherits:
ProcedureRoutine show all
Defined in:
lib/procedure_dsl.rb

Overview

Same as Distribution, but the buckets get expenentially wider

Instance Method Summary collapse

Methods inherited from ProcedureRoutine

#finish, #initialize, #method_missing

Constructor Details

This class inherits a constructor from ApacheCrunch::ProcedureRoutine

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class ApacheCrunch::ProcedureRoutine

Instance Method Details

#_key_for(val, width_base) ⇒ Object

Determines the key for the distribution hash given the value and logarithmic base for the bucket width



195
196
197
198
 
# File 'lib/procedure_dsl.rb', line 195

def _key_for(val, width_base)
    exp = (Math.log(val) / Math.log(width_base)).to_i
    width_base ** exp
end

#execute(width_base, &blk) ⇒ Object 



171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
 
# File 'lib/procedure_dsl.rb', line 171

def execute(width_base, &blk)
    dist = {}
    while @_current_entry = @_log_parser.next_entry
        val = instance_eval(&blk)
        k = _key_for(val, width_base)
        if dist.key?(k)
            dist[k] += 1
        else
            dist[k] = 1
        end
    end

    # Backfill keys for which we didn't find a value
    k = dist.keys.min
    max_key = dist.keys.max
    while k *= width_base and k < max_key
        dist[k] = 0 unless dist.key?(k)
    end

    dist
end