io.gatling.core.util.LineCounter.scala Maven / Gradle / Ivy
/*
* Copyright 2011-2024 GatlingCorp (https://gatling.io)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.gatling.core.util
import java.io._
import java.nio.charset.Charset
import scala.util.Using
import io.github.metarank.cfor._
object LineCounter {
val DefaultBufferSize: Int = 8 * 1024
def apply(charset: Charset): LineCounter = new LineCounter(charset, DefaultBufferSize)
}
class LineCounter(charset: Charset, bufferSize: Int) {
protected var lines = 0
private var inLine = false
private var read = 0
private val readCharBuffer = new Array[Char](bufferSize)
protected def continueReading: Boolean = true
protected def onChar(c: Char): Unit = {}
protected def onLine(): Unit = {}
protected def onDone(): Unit = {}
def countLines(is: InputStream): Int =
Using.resource(new InputStreamReader(new BufferedInputStream(is, bufferSize), charset)) { reader =>
while (read != -1 && continueReading) {
cfor(0 until read) { i =>
val c = readCharBuffer(i)
if (c == '\r' || c == '\n') {
if (inLine) {
lines += 1
onLine()
}
inLine = false
} else {
inLine = true
onChar(c)
}
}
read = reader.read(readCharBuffer)
}
// last line
if (inLine) {
lines += 1
}
onDone()
val res = lines
// reset
lines = 0
inLine = false
read = 0
res
}
}