EnsureDeadLockStressTest.java

package org.multiverse.stms.gamma.integration.liveness;

import org.junit.Before;
import org.junit.Test;
import org.multiverse.TestThread;
import org.multiverse.api.Txn;
import org.multiverse.api.TxnExecutor;
import org.multiverse.api.LockMode;
import org.multiverse.api.callables.TxnVoidCallable;
import org.multiverse.stms.gamma.GammaStm;
import org.multiverse.stms.gamma.transactionalobjects.GammaTxnLong;

import static org.multiverse.TestUtils.*;
import static org.multiverse.api.GlobalStmInstance.getGlobalStmInstance;
import static org.multiverse.api.TxnThreadLocal.clearThreadLocalTxn;

public class EnsureDeadLockStressTest {

    private int threadCount = 4;
    private int refCount = 5;
    private volatile boolean stop;
    private GammaStm stm;
    private GammaTxnLong[] refs;

    @Before
    public void setUp() {
        clearThreadLocalTxn();
        stm = (GammaStm) getGlobalStmInstance();
        stop = false;

        refs = new GammaTxnLong[refCount];
        for (int k = 0; k < refCount; k++) {
            refs[k] = new GammaTxnLong(stm);
        }
    }

    @Test
    public void test() {
        StressThread[] threads = new StressThread[threadCount];
        for (int k = 0; k < threads.length; k++) {
            threads[k] = new StressThread(k);
        }

        startAll(threads);
        sleepMs(getStressTestDurationMs(60 * 1000));
        stop = true;
        joinAll(threads);
    }

    class StressThread extends TestThread {
        private boolean leftToRight;

        public StressThread(int id) {
            super("StressThread-" + id);
            this.leftToRight = id % 2 == 0;
        }

        @Override
        public void doRun() throws Exception {
            TxnExecutor executor = stm.newTxnFactoryBuilder()
                    .setSpinCount(1000)
                    .setMaxRetries(10000)
                    .newTxnExecutor();

            TxnVoidCallable callable = new TxnVoidCallable() {
                @Override
                public void call(Txn tx) throws Exception {
                    if (leftToRight) {
                        for (int k = 0; k < refCount; k++) {
                            refs[k].getLock().acquire(tx, LockMode.Write);
                            sleepMs(5);
                        }
                    } else {
                        for (int k = refCount - 1; k >= 0; k--) {
                            refs[k].getLock().acquire(tx, LockMode.Write);
                            sleepMs(5);
                        }
                    }
                }
            };

            int k = 0;
            while (!stop) {
                executor.execute(callable);
                sleepMs(10);
                k++;

                if (k % 10 == 0) {
                    System.out.printf("%s is at %s\n", getName(), k);
                }
            }
        }
    }
}