/*
 * Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
 *
 * 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 com.hazelcast.test;

import com.hazelcast.logging.Logger;

import static com.hazelcast.test.HazelcastTestSupport.assertTrueEventually;
import static java.lang.String.format;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

public abstract class TestThread extends Thread {

    private volatile Throwable error;

    public TestThread() {
    }

    public TestThread(String name) {
        super(name);
    }

    @Override
    public final void run() {
        Logger.getLogger(getClass()).info(getName() + " Starting");
        try {
            doRun();
            Logger.getLogger(getClass()).info(getName() + " Completed");
        } catch (Throwable t) {
            Logger.getLogger(getClass()).warning(getName() + " Completed with failure", t);
            this.error = t;
            onError(t);
        }
    }

    public void onError(Throwable t) {
    }

    public Throwable getError() {
        return error;
    }

    public abstract void doRun() throws Throwable;

    /**
     * Asserts that the thread eventually completes, no matter if there is an error or not.
     */
    public void assertTerminates() {
        assertTrueEventually(new AssertTask() {
            @Override
            public void run() throws Exception {
                assertFalse(format("Thread %s is still alive", getName()), isAlive());
            }
        });
    }

    /**
     * Assert that the thread eventually completes without an error.
     */
    public void assertSucceedsEventually() {
        assertTerminates();
        assertNull("No error should have been thrown, but " + getName() + " completed error", error);
    }

    /**
     * Asserts that the thread eventually completes with the expected error.
     *
     * @param cause the expected cause
     */
    public void assertFailsEventually(Class<? extends Throwable> cause) {
        assertTerminates();
        assertNotNull("an error should have been thrown, but " + getName() + " completed without error", error);
        assertTrue("error instanceof " + error, error.getClass().isAssignableFrom(cause));
    }
}