/*
    * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
    *
    * This library is free software; you can redistribute it and/or
    * modify it under the terms of the GNU Lesser General Public
    * License as published by the Free Software Foundation; either
    * version 2.1 of the License, or (at your option) any later version.
    *
    * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
   *
   * Additionally licensed with:
   *
   * 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 org.spf4j.concurrent.jdbc;
  
  import java.sql.SQLException;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  import java.util.concurrent.locks.Condition;
  import java.util.concurrent.locks.Lock;
  import javax.sql.DataSource;
  import org.spf4j.base.ExecutionContexts;
  import org.spf4j.base.UncheckedTimeoutException;
  import org.spf4j.concurrent.LockRuntimeException;
  
  /**
   * A Jdbc Lock implementation.
   * @author zoly
   */
  public final class JdbcLock implements Lock, AutoCloseable {
  
    private final JdbcSemaphore semaphore;
  
    private final int jdbcTimeoutSeconds;
  
    public JdbcLock(final DataSource dataSource, final SemaphoreTablesDesc semTableDesc,
            final String lockName, final int jdbcTimeoutSeconds) throws InterruptedException, SQLException {
      this.semaphore = new JdbcSemaphore(dataSource, semTableDesc, lockName, 1, jdbcTimeoutSeconds, true);
      this.jdbcTimeoutSeconds = jdbcTimeoutSeconds;
      this.semaphore.registerJmx();
    }
  
    @Override
    public void lock() {
      try {
          semaphore.acquire(ExecutionContexts.getMillisToDeadline(), TimeUnit.MILLISECONDS);
      } catch (InterruptedException ex) {
        Thread.currentThread().interrupt();
        throw new LockRuntimeException(ex);
      } catch (TimeoutException ex) {
          throw new UncheckedTimeoutException(ex);
      }
    }
  
    @Override
    public void lockInterruptibly() throws InterruptedException {
      try {
        semaphore.acquire(ExecutionContexts.getMillisToDeadline(), TimeUnit.MILLISECONDS);
      } catch (TimeoutException ex) {
        throw new UncheckedTimeoutException(ex);
      }
    }
  
    @Override
    public boolean tryLock() {
      try {
        return semaphore.tryAcquire(((long) jdbcTimeoutSeconds) * 2, TimeUnit.SECONDS);
      } catch (InterruptedException ex) {
        Thread.currentThread().interrupt();
        throw new LockRuntimeException(ex);
      }
    }
  
    @Override
    public boolean tryLock(final long time, final TimeUnit unit) throws InterruptedException {
        return semaphore.tryAcquire(time, unit);
    }
  
    @Override
    public void unlock() {
      semaphore.release();
   }
 
   @Override
   public Condition newCondition() {
     throw new UnsupportedOperationException();
   }
 
   @Override
   public void close() {
     semaphore.close();
   }
 
   @Override
   public String toString() {
     return "JdbcLock{" + "semaphore=" + semaphore + ", jdbcTimeoutSeconds=" + jdbcTimeoutSeconds + '}';
   }
 
 
 
 }