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ScalaTest is a free, open-source testing toolkit for Scala and Java programmers.

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/*
 * Copyright 2001-2008 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

/**
 * Trait whose instances facilitate parallel execution of Suites.
 * An optional Distributor is passed to the run method of Suite. If a
 * Distributor is indeed passed, trait Suite's implementation of run will
 * populate that Distributor with its nested Suites (by passing them to the Distributor's
 * apply method) rather than executing the nested Suites directly. It is then up to another thread or process
 * to execute those Suites.
 *
 * 
 * If you have a set of nested Suites that must be executed sequentially, you can mix in trait
 * SequentialNestedSuiteExecution, which overrides runNestedSuites and
 * calls super's runNestedSuites implementation, passing in None for the
 * Distributor.
 * 
 * 
 * 
 * Implementations of this trait must be thread safe.
 * 
 *
 * @author Bill Venners
 */
trait Distributor extends ((Suite, Tracker) => Unit) {

  /**
   * Puts a Suite into the Distributor.
   *
   * @param suite the Suite to put into the Distributor.
   * @param tracker a Tracker to pass to the Suite's run method.
   *
   * @throws NullPointerException if either suite or tracker is null.
   */
  override def apply(suite: Suite, tracker: Tracker)
}