package org.infinispan.replication;

import static org.testng.AssertJUnit.assertEquals;
import static org.testng.AssertJUnit.assertNull;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import javax.transaction.TransactionManager;

import org.infinispan.Cache;
import org.infinispan.configuration.cache.CacheMode;
import org.infinispan.configuration.cache.ConfigurationBuilder;
import org.infinispan.test.MultipleCacheManagersTest;
import org.infinispan.test.TestingUtil;
import org.infinispan.transaction.LockingMode;
import org.infinispan.transaction.lookup.DummyTransactionManagerLookup;
import org.infinispan.transaction.tm.DummyTransactionManager;
import org.testng.annotations.Test;

/**
 * Tests for lock API
 * <p/>
 * Introduce lock() API methods https://jira.jboss.org/jira/browse/ISPN-48
 *
 * @author Manik Surtani
 * @author Vladimir Blagojevic
 */
@Test(groups = "functional", testName = "replication.SyncReplLockingTest")
public class SyncReplLockingTest extends MultipleCacheManagersTest {
   private String k = "key", v = "value";

   public SyncReplLockingTest() {
      cleanup = CleanupPhase.AFTER_METHOD;
   }

   protected CacheMode getCacheMode() {
      return CacheMode.REPL_SYNC;
   }

   @Override
   protected void createCacheManagers() throws Throwable {
      ConfigurationBuilder cfg = getDefaultClusteredCacheConfig(getCacheMode(), true);
      cfg.transaction().transactionManagerLookup(new DummyTransactionManagerLookup())
            .lockingMode(LockingMode.PESSIMISTIC)
            .locking().lockAcquisitionTimeout(500);
      createClusteredCaches(2, "testcache", cfg);
      waitForClusterToForm("testcache");
   }

   public void testLocksReleasedWithoutExplicitUnlock() throws Exception {
      locksReleasedWithoutExplicitUnlockHelper(false, false);
      locksReleasedWithoutExplicitUnlockHelper(true, false);
      locksReleasedWithoutExplicitUnlockHelper(false, true);
      locksReleasedWithoutExplicitUnlockHelper(true, true);
   }

   public void testConcurrentNonTxLocking() throws Exception {
      concurrentLockingHelper(false, false);
      concurrentLockingHelper(true, false);
   }

   public void testConcurrentTxLocking() throws Exception {
      concurrentLockingHelper(false, true);
      concurrentLockingHelper(true, true);
   }

   public void testLocksReleasedWithNoMods() throws Exception {
      Cache cache1 = cache(0, "testcache");
      Cache cache2 = cache(1, "testcache");
      assertClusterSize("Should only be 2  caches in the cluster!!!", 2);

      assertNull("Should be null", cache1.get(k));
      assertNull("Should be null", cache2.get(k));

      TransactionManager mgr = TestingUtil.getTransactionManager(cache1);
      mgr.begin();

      cache1.getAdvancedCache().lock(k);

      //do a dummy read
      cache1.get(k);
      mgr.commit();

      assertEventuallyNotLocked(cache1, "testcache");
      assertEventuallyNotLocked(cache2, "testcache");

      assert cache1.isEmpty();
      assert cache2.isEmpty();
      cache1.clear();
      cache2.clear();
   }

   public void testReplaceNonExistentKey() throws Exception {
      Cache cache1 = cache(0, "testcache");
      Cache cache2 = cache(1, "testcache");
      assertClusterSize("Should only be 2  caches in the cluster!!!", 2);

      TransactionManager mgr = TestingUtil.getTransactionManager(cache1);
      mgr.begin();

      cache1.getAdvancedCache().lock(k);

      // do a replace on empty key
      // https://jira.jboss.org/browse/ISPN-514
      Object old = cache1.replace(k, "blah");
      assertNull("Should be null", cache1.get(k));

      boolean replaced = cache1.replace(k, "Vladimir", "Blagojevic");
      assert !replaced;

      assertNull("Should be null", cache1.get(k));
      mgr.commit();

      assertEventuallyNotLocked(cache1, "testcache");
      assertEventuallyNotLocked(cache2, "testcache");

      assert cache1.isEmpty();
      assert cache2.isEmpty();
      cache1.clear();
      cache2.clear();
   }

   private void concurrentLockingHelper(final boolean sameNode, final boolean useTx) throws Exception {
      log.debugf("sameNode=%s, useTx=%s", sameNode, useTx);
      final Cache cache1 = cache(0, "testcache");
      final Cache cache2 = cache(1, "testcache");
      assertClusterSize("Should only be 2  caches in the cluster!!!", 2);

      assertNull("Should be null", cache1.get(k));
      assertNull("Should be null", cache2.get(k));
      final CountDownLatch latch = new CountDownLatch(1);

      Thread t = getTestThreadFactory("Worker").newThread(new Runnable() {
         @Override
         public void run() {
            log.info("Concurrent " + (useTx ? "tx" : "non-tx") + " write started "
                  + (sameNode ? "on same node..." : "on a different node..."));
            DummyTransactionManager mgr = null;
            try {
               if (useTx) {
                  mgr = (DummyTransactionManager) TestingUtil.getTransactionManager(sameNode ? cache1 : cache2);
                  mgr.begin();
               }
               if (sameNode) {
                  cache1.put(k, "JBC");
               } else {
                  cache2.put(k, "JBC");
               }
               if (useTx) {
                  if (!mgr.getTransaction().runPrepare()) { //couldn't prepare
                     latch.countDown();
                     mgr.rollback();
                  }
               }
            } catch (Exception e) {
               if (useTx) {
                  try {
                     mgr.commit();
                  } catch (Exception e1) {
                  }
               }
               latch.countDown();
            }
         }
      });

      String name = "Infinispan";
      TransactionManager mgr = TestingUtil.getTransactionManager(cache1);
      mgr.begin();

      log.trace("Here is where the fun starts...Here is where the fun starts...");

      // lock node and start other thread whose write should now block
      cache1.getAdvancedCache().lock(k);
      t.start();

      // wait till the put in thread t times out
      assert latch.await(10, TimeUnit.SECONDS) : "Concurrent put didn't time out!";

      cache1.put(k, name);
      mgr.commit();

      assertNotLocked("testcache", k);
      t.join();


      cache2.remove(k);
      assert cache1.isEmpty();
      assert cache2.isEmpty();
      cache1.clear();
      cache2.clear();
   }

   private void locksReleasedWithoutExplicitUnlockHelper(boolean lockPriorToPut, boolean useCommit)
         throws Exception {
      log.debugf("lockPriorToPut=%s, useCommit=%s", lockPriorToPut, useCommit);

      Cache cache1 = cache(0, "testcache");
      Cache cache2 = cache(1, "testcache");

      assertClusterSize("Should only be 2  caches in the cluster!!!", 2);

      assertNull("Should be null", cache1.get(k));
      assertNull("Should be null", cache2.get(k));

      String name = "Infinispan";
      TransactionManager mgr = TestingUtil.getTransactionManager(cache1);
      mgr.begin();
      if (lockPriorToPut)
         cache1.getAdvancedCache().lock(k);
      cache1.put(k, name);
      if (!lockPriorToPut)
         cache1.getAdvancedCache().lock(k);

      if (useCommit)
         mgr.commit();
      else
         mgr.rollback();

      if (useCommit) {
         assertEquals(name, cache1.get(k));
         assertEquals("Should have replicated", name, cache2.get(k));
      } else {
         assertEquals(null, cache1.get(k));
         assertEquals("Should not have replicated", null, cache2.get(k));
      }

      cache2.remove(k);
      assert cache1.isEmpty();
      assert cache2.isEmpty();
      cache1.clear();
      cache2.clear();
   }

}
