package org.junit.runner.notification;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import org.junit.internal.AssumptionViolatedException;
import org.junit.runner.Description;
import org.junit.runner.Result;

/**
 * Register an instance of this class with {@link RunNotifier} to be notified
 * of events that occur during a test run. All of the methods in this class
 * are abstract and have no implementation; override one or more methods to
 * receive events.
 *
 * <p>For example, suppose you have a <code>Cowbell</code>
 * class that you want to make a noise whenever a test fails. You could write:
 * <pre>
 * public class RingingListener extends RunListener {
 *    public void testFailure(Failure failure) {
 *       Cowbell.ring();
 *    }
 * }
 * </pre>
 *
 * <p>To invoke your listener, you need to run your tests through <code>JUnitCore</code>.
 * <pre>
 * public void main(String... args) {
 *    JUnitCore core= new JUnitCore();
 *    core.addListener(new RingingListener());
 *    core.run(MyTestClass.class);
 * }
 * </pre>
 *
 * <p>If a listener throws an exception for a test event, the other listeners will
 * have their {@link RunListener#testFailure(Failure)} called with a {@code Description}
 * of {@link Description#TEST_MECHANISM} to indicate the failure.
 *
 * <p>By default, JUnit will synchronize calls to your listener. If your listener
 * is thread-safe and you want to allow JUnit to call your listener from
 * multiple threads when tests are run in parallel, you can annotate your
 * test class with {@link RunListener.ThreadSafe}.
 *
 * <p>Listener methods will be called from the same thread as is running
 * the test, unless otherwise indicated by the method Javadoc
 *
 * @see org.junit.runner.JUnitCore
 * @since 4.0
 */
public class RunListener {

    /**
     * Called before any tests have been run. This may be called on an
     * arbitrary thread.
     *
     * @param description describes the tests to be run
     */
    public void testRunStarted(Description description) throws Exception {
    }

    /**
     * Called when all tests have finished. This may be called on an
     * arbitrary thread.
     *
     * @param result the summary of the test run, including all the tests that failed
     */
    public void testRunFinished(Result result) throws Exception {
    }

    /**
     * Called when an atomic test is about to be started.
     *
     * @param description the description of the test that is about to be run
     * (generally a class and method name)
     */
    public void testStarted(Description description) throws Exception {
    }

    /**
     * Called when an atomic test has finished, whether the test succeeds or fails.
     *
     * @param description the description of the test that just ran
     */
    public void testFinished(Description description) throws Exception {
    }

    /**
     * Called when an atomic test fails, or when a listener throws an exception.
     *
     * <p>In the case of a failure of an atomic test, this method will be called
     * with the same {@code Description} passed to
     * {@link #testStarted(Description)}, from the same thread that called
     * {@link #testStarted(Description)}.
     *
     * <p>In the case of a listener throwing an exception, this will be called with
     * a {@code Description} of {@link Description#TEST_MECHANISM}, and may be called
     * on an arbitrary thread.
     *
     * @param failure describes the test that failed and the exception that was thrown
     */
    public void testFailure(Failure failure) throws Exception {
    }

    /**
     * Called when an atomic test flags that it assumes a condition that is
     * false
     *
     * @param failure describes the test that failed and the
     * {@link AssumptionViolatedException} that was thrown
     */
    public void testAssumptionFailure(Failure failure) {
    }

    /**
     * Called when a test will not be run, generally because a test method is annotated
     * with {@link org.junit.Ignore}.
     *
     * @param description describes the test that will not be run
     */
    public void testIgnored(Description description) throws Exception {
    }


    /**
     * Indicates a {@code RunListener} that can have its methods called
     * concurrently. This implies that the class is thread-safe (i.e. no set of
     * listener calls can put the listener into an invalid state, even if those
     * listener calls are being made by multiple threads without
     * synchronization).
     *
     * @since 4.12
     */
    @Documented
    @Target(ElementType.TYPE)
    @Retention(RetentionPolicy.RUNTIME)
    public @interface ThreadSafe {
    }
}

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