Maven migration (first draft)

legacy/utilities/performance-measurement/scanner.rb

@@ -0,0 +1,116 @@
+class LogRecord
+  attr_accessor :time
+  attr_accessor :method
+  attr_accessor :query
+  attr_accessor :stack
+  def to_s
+    "LogRecord: time=#{@time}\n   query: #{@query}\n   stack - #{@stack.size} lines:\n    #{@stack.join("    ")}"
+  end
+end
+
+class LogFileParser
+  # ------------------------------------------------------------------------------------
+  private
+  # ------------------------------------------------------------------------------------
+  #
+  def get_line()
+    if @line_buffer
+      line = @line_buffer
+      @line_buffer = nil
+      return line
+    elsif @file.eof?
+      return nil
+    else
+      @lines += 1
+      return @file.readline
+    end
+  end
+
+  def unget_line(line)
+    @line_buffer = line
+  end
+
+  def parse_first_line(line)
+    match = /\[RDFServiceLogger\]\s+([0-9.]+).*\[(\w*, )?(.+)\]\s*$/.match(line)
+    return nil unless match
+
+    log_record = LogRecord.new
+    log_record.time = match[1].to_f
+    log_record.query = match[3].strip.gsub(/\s+/, ' ')
+    log_record.stack = []
+    return log_record
+  end
+
+  def is_stack_line(line)
+    return false unless line
+    return line.start_with?(' ')
+  end
+
+  def next_record()
+    while true
+      first_line = get_line
+      return nil unless first_line
+      log_record = parse_first_line(first_line)
+      break if log_record
+    end
+
+    while true
+      stack_line = get_line
+      if is_stack_line(stack_line)
+        log_record.stack << stack_line
+      else
+        unget_line(stack_line)
+        return log_record
+      end
+    end
+  end
+
+  # ------------------------------------------------------------------------------------
+  public
+
+  # ------------------------------------------------------------------------------------
+  #
+  def parse_records()
+    @file = File.new(@log_file)
+    begin
+      while true
+        record = next_record()
+        break unless record
+        yield record
+      end
+    ensure
+      @file.close
+    end
+  end
+
+  def initialize(log_file)
+    @log_file = log_file
+    @line_buffer = nil
+    @lines = 0
+  end
+  
+  def report()
+    puts "LogFileParser: read #{@lines} lines from '#{@log_file}'"
+  end
+end
+
+class Scanner
+  # ------------------------------------------------------------------------------------
+  private
+  # ------------------------------------------------------------------------------------
+
+  # ------------------------------------------------------------------------------------
+  public
+  # ------------------------------------------------------------------------------------
+  def initialize(partition)
+    @partition = partition
+  end
+
+  def process(log_file)
+    lfp = LogFileParser.new(log_file)
+    lfp.parse_records() do | log_record |
+      @partition.accumulate(log_record)
+    end
+    lfp.report
+  end
+end