How to use

HiveClientCache$CacheableHiveMetaStoreClient

in

org.apache.hive.hcatalog.common

 /**
  * GC is attempting to destroy the object.
  * No one references this client anymore, so it can be torn down without worrying about user counts.
  * @throws Throwable
  */
 @Override
 protected void finalize() throws Throwable {
  if (users.get() != 0) {
   LOG.warn("Closing client with non-zero user count: users=" + users.get() + " expired=" + expiredFromCache);
  }
  try {
   this.tearDown();
  } finally {
   super.finalize();
  }
 }
}

 /**
  * GC is attempting to destroy the object.
  * No one references this client anymore, so it can be torn down without worrying about user counts.
  * @throws Throwable
  */
 @Override
 protected void finalize() throws Throwable {
  if (users.get() != 0) {
   LOG.warn("Closing client with non-zero user count: users=" + users.get() + " expired=" + expiredFromCache);
  }
  try {
   this.tearDown();
  } finally {
   super.finalize();
  }
 }
}

/**
 * Attempt to tear down the client connection.
 * The connection will be closed if the following conditions hold:
 *  1. There are no active user holding the client.
 *  2. The client has been evicted from the cache.
 */
public synchronized void tearDownIfUnused() {
 if (users.get() != 0) {
  LOG.warn("Non-zero user count preventing client tear down: users=" + users.get() + " expired=" + expiredFromCache);
 }
 if (users.get() == 0 && expiredFromCache) {
  this.tearDown();
 }
}

/**
 * Tear down only if
 *  1. There are no active user
 *  2. It has expired from the cache
 */
public void tearDownIfUnused() {
 if (users.get() == 0 && expiredFromCache) {
  this.tearDown();
 }
}

/**
 * Tear down only if
 *  1. There are no active user
 *  2. It has expired from the cache
 */
public void tearDownIfUnused() {
 if (users.get() == 0 && expiredFromCache) {
  this.tearDown();
 }
}

/**
 * Decrement the user count and piggyback this to set expiry flag as well, then  teardown(), if conditions are met.
 * This *MUST* be called by anyone who uses this client.
 */
@Override
public synchronized void close() {
 release();
 tearDownIfUnused();
}

 /**
  * Last effort to clean up, may not even get called.
  * @throws Throwable
  */
 @Override
 protected void finalize() throws Throwable {
  try {
   this.tearDown();
  } finally {
   super.finalize();
  }
 }
}

/**
 * Decrement the user count and piggyback this to set expiry flag as well, then  teardown(), if conditions are met.
 * This *MUST* be called by anyone who uses this client.
 */
@Override
public void close() {
 release();
 if (System.currentTimeMillis() >= expiryTime)
  setExpiredFromCache();
 tearDownIfUnused();
}

 /**
  * Last effort to clean up, may not even get called.
  * @throws Throwable
  */
 @Override
 protected void finalize() throws Throwable {
  try {
   this.tearDown();
  } finally {
   super.finalize();
  }
 }
}

 /**
  * Last effort to clean up, may not even get called.
  * @throws Throwable
  */
 @Override
 protected void finalize() throws Throwable {
  try {
   this.tearDown();
  } finally {
   super.finalize();
  }
 }
}

/**
 * Tear down only if
 *  1. There are no active user
 *  2. It has expired from the cache
 */
public void tearDownIfUnused() {
 if (users.get() == 0 && expiredFromCache) {
  this.tearDown();
 }
}

/**
 * Decrement the user count and piggyback this to set expiry flag as well, then  teardown(), if conditions are met.
 * This *MUST* be called by anyone who uses this client.
 */
@Override
public void close() {
 release();
 if (System.currentTimeMillis() >= expiryTime)
  setExpiredFromCache();
 tearDownIfUnused();
}

/**
 * Decrement the user count and piggyback this to set expiry flag as well, then  teardown(), if conditions are met.
 * This *MUST* be called by anyone who uses this client.
 */
@Override
public void close() {
 release();
 if (System.currentTimeMillis() >= expiryTime)
  setExpiredFromCache();
 tearDownIfUnused();
}

  (HiveClientCache.CacheableHiveMetaStoreClient) cache.get(metaServer.getHiveConf());
assertTrue(client.isOpen());
 client.dropTable(DB_NAME, LONG_TABLE_NAME);
} catch (Exception e) {
 client.dropDatabase(DB_NAME);
} catch (Exception e) {
client.createDatabase(new Database(DB_NAME, "", null, null));
 client.createTable(tbl);
 fail("Exception was expected while creating table with long name");
} catch (Exception e) {
assertFalse(client.isOpen());
metaServer.shutDown();

/**
 * Attempt to tear down the client connection.
 * The connection will be closed if the following conditions hold:
 *  1. There are no active user holding the client.
 *  2. The client has been evicted from the cache.
 */
public synchronized void tearDownIfUnused() {
 if (users.get() != 0) {
  LOG.warn("Non-zero user count preventing client tear down: users=" + users.get() + " expired=" + expiredFromCache);
 }
 if (users.get() == 0 && expiredFromCache) {
  this.tearDown();
 }
}

/**
 * Decrement the user count and piggyback this to set expiry flag as well, then  teardown(), if conditions are met.
 * This *MUST* be called by anyone who uses this client.
 */
@Override
public synchronized void close() {
 release();
 tearDownIfUnused();
}