* limitations under the License.
 */

package gradlebuild.binarycompatibility

import org.gradle.kotlin.dsl.*
import org.gradle.testkit.runner.BuildResult
import org.gradle.testkit.runner.GradleRunner
import org.gradle.testkit.runner.UnexpectedBuildFailure
import org.hamcrest.CoreMatchers
import org.hamcrest.MatcherAssert.assertThat
import org.junit.Assert.assertFalse
import org.junit.Assert.assertTrue

import okhttp3.internal.threadFactory

/**
 * A set of worker threads that are shared among a set of task queues.
 *
 * Use [INSTANCE] for a task runner that uses daemon threads. There is not currently a shared
 * instance for non-daemon threads.
 *
 * The task runner is also responsible for releasing held threads when the library is unloaded.
 * This is for the benefit of container environments that implement code unloading.
 *

    val os = Os.LINUX
    val buildTypeThis = this
    val testProject = "smallJavaMultiProject"

    fun BuildSteps.gradleStep(tasks: List<String>) {
        gradleWrapper {
            name = "GRADLE_RUNNER"
            gradleParams = (
                tasks +
                    buildToolGradleParameters(isContinue = false)
                ).joinToString(separator = " ")
            skipConditionally()
        }
    }

[2020-01-01 00:00:00] << 0x00000003   288 DATA
[2020-01-01 00:00:00] << 0x00000003     0 DATA          END_STREAM
[2020-01-01 00:00:00] << 0x00000000     8 GOAWAY
[2020-01-01 00:00:05] << 0x00000000     8 GOAWAY
```

### Task Runner Logging 

This logs task enqueues, starts, and finishes.

```
[2020-01-01 00:00:00] Q10000 scheduled after   0 µs: OkHttp ConnectionPool
[2020-01-01 00:00:00] Q10000 starting              : OkHttp ConnectionPool

    killProcessStep(KILL_LEAKED_PROCESSES_FROM_PREVIOUS_BUILDS, os, arch)

    (1..10).forEach { idx ->
        steps {
            gradleWrapper {
                name = "GRADLE_RUNNER_$idx"
                tasks = "%$testTaskParameterName% -PrerunAllTests --tests %$testNameParameterName% %$testTaskOptionsParameterName%"
                gradleParams = parameters

        "CODEQL_JAVA_HOME",
        "CODEQL_EXTRACTOR_JAVA_SCRATCH_DIR",
        "CODEQL_ACTION_RUN_MODE",
        "CODEQL_ACTION_VERSION",
        "CODEQL_DIST",
        "CODEQL_PLATFORM",
        "CODEQL_RUNNER"
    )

    private
    val architecture = System.getProperty("os.arch").toLowerCase()

    val isCiServer = CI_ENVIRONMENT_VARIABLE in System.getenv()
    val isTravis = "TRAVIS" in System.getenv()

  /** How many times a new task has been started. Guarded by [TaskRunner.lock]. */
  private var contextSwitchCount = 0

  /** Guarded by [TaskRunner.lock]. */
  private var activeThreads = 0

  /** A task runner that posts tasks to this fake. Tasks won't be executed until requested. */
  val taskRunner: TaskRunner =
    TaskRunner(
      object : TaskRunner.Backend {
        override fun execute(
          taskRunner: TaskRunner,

class ConnectionPoolTest {
  private val routePlanner = FakeRoutePlanner()
  private val factory = routePlanner.factory
  private val taskFaker = routePlanner.taskFaker
  private val peer = MockHttp2Peer()

  /** The fake task runner prevents the cleanup runnable from being started.  */
  private val addressA = factory.newAddress("a")
  private val routeA1 = factory.newRoute(addressA)
  private val addressB = factory.newAddress("b")

Everyone before you is waiting for their burgers to be ready before leaving the counter because each of the 8 cashiers goes and prepares the burger right away before getting the next order.

<img src="/img/async/parallel-burgers/parallel-burgers-01.png" class="illustration">

Die Spezifikation besagt auch, dass `username` und `password` als Formulardaten gesendet werden müssen (hier also kein JSON).

### <abbr title="Geltungsbereich">`scope`</abbr>

Ferner sagt die Spezifikation, dass der Client ein weiteres Formularfeld "`scope`" („Geltungsbereich“) senden kann.