org.scalatest.ParallelTestExecution.scala Maven / Gradle / Ivy
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/*
* Copyright 2001-2009 Artima, Inc.
*
* 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 org.scalatest
import tools.DistributedTestRunnerSuite
/**
* Trait that causes that the tests of any suite it is mixed into to be run in parallel if
* a Distributor is passed to runTests.
*
*
* ScalaTest's normal approach for running suites of tests in parallel is to run different suites in parallel,
* but the tests of any one suite sequentially. This approach should provide sufficient distribution of the work load
* in most cases, but some suites may encapsulate multiple long-running tests. Such suites may dominate the execution
* time of the run. If so, mixing in this trait into just those suites will allow their long-running tests to run in parallel with each
* other, thereby helping to reduce the total time required to run an entire run.
*
*
*
* Because this trait extends OneInstancePerTest,
* each test will be run its own instance of the suite's class. This trait overrides the
* runTests method. If no Distributor is passed to runTests,
* this trait's implementation simply invokes its supertrait OneInstancePerTest's implementation
* of runTests, which will run each test in its own instance sequentially. If a Distributor
* is passed, however, this traits' implementation of runTests will, for each test, wrap a new instance of the
* suite in a special wrapper suite that will invoke just that one test, and passes the wrapper suites to the Distributor.
* The thread or entity that takes a wrapper suite from the Distributor will invoke run
* on the wrapper suite, which will run just one test. In this way, different tests of a suite that mixes in
* ParallelTestExecution will run in parallel.
*
*
* @author Bill Venners
*/
trait ParallelTestExecution extends OneInstancePerTest {
this: Suite =>
// Skipping runTests here, but that's OK, because by mixing in ParallelTestExecution, the programmer decided
// that the super.runTests should be replaced by the one defined in ParallelTestExecution.
private[scalatest] def runOneTest(testName: String, reporter: Reporter, stopper: Stopper,
configMap: Map[String, Any], tracker: Tracker) {
runTest(testName, reporter, stopper, configMap, tracker)
}
/**
* Run the tests of this suite in parallel.
*
* @param testName an optional name of one test to run. If None, all relevant tests should be run.
* I.e., None acts like a wildcard that means run all relevant tests in this Suite.
* @param reporter the Reporter to which results will be reported
* @param stopper the Stopper that will be consulted to determine whether to stop execution early.
* @param filter a Filter with which to filter tests based on their tags
* @param configMap a Map of key-value pairs that can be used by the executing Suite of tests.
* @param distributor an optional Distributor, into which to put nested Suites to be run
* by another entity, such as concurrently by a pool of threads. If None, nested Suites will be run sequentially.
* @param tracker a Tracker tracking Ordinals being fired by the current thread.
* @throws NullPointerException if any of the passed parameters is null.
* @throws IllegalArgumentException if testName is defined, but no test with the specified test name
* exists in this Suite
*/
protected abstract override def runTests(testName: Option[String], reporter: Reporter, stopper: Stopper, filter: Filter,
configMap: Map[String, Any], distributor: Option[Distributor], tracker: Tracker) {
// testName distributor
// None None call super, because no distributor
// Some None call super, because no distributor
// None Some wrap a newInstance and put it in the distributor
// Some Some this would be the one where we need to actually run the test, ignore the distributor
distributor match {
// If there's no distributor, then just run sequentially, via the regular OneInstancePerTest
// algorithm
case None => super.runTests(testName, reporter,stopper, filter, configMap, distributor, tracker)
case Some(distribute) =>
testName match {
// The only way both testName and distributor should be defined is if someone called from the
// outside and did this. First run is called with testName None and a defined Distributor, it
// will not get here. So in this case, just do the usual OneInstancePerTest thing.
// TODO: Make sure it doesn't get back here. Walk through the scenarios.
case Some(tn) => super.runTests(testName, reporter, stopper, filter, configMap, distributor, tracker)
case None =>
for (tn <- testNames) {
val wrappedInstance =
new DistributedTestRunnerSuite(
newInstance.asInstanceOf[ParallelTestExecution],
tn
)
distribute(wrappedInstance, tracker.nextTracker)
}
}
}
}
}