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// Copyright (C) 2011 Philip Aston
// All rights reserved.
//
// This file is part of The Grinder software distribution. Refer to
// the file LICENSE which is part of The Grinder distribution for
// licensing details. The Grinder distribution is available on the
// Internet at http://grinder.sourceforge.net/
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.

package net.grinder.synchronisation;

import java.util.Set;

import net.grinder.communication.CommunicationException;
import net.grinder.synchronisation.messages.BarrierIdentity;


/**
 * {@link BarrierGroups} implementation for use within the local JVM.
 *
 * @author Philip Aston
 */
public class LocalBarrierGroups extends AbstractBarrierGroups {

  /**
   * {@inheritDoc}
   */
  @Override
  protected BarrierGroupImplementation createBarrierGroup(String name) {

    return new BarrierGroupImplementation(name) {

      @Override public void removeBarriers(long n)
        throws CommunicationException {

        final Set waiters;

        synchronized (this) {
          super.removeBarriers(n);
          waiters = checkCondition();
        }

        if (waiters.size() > 0) {
          fireAwaken(waiters);
        }
      }

      @Override public void addWaiter(BarrierIdentity barrierIdentity)
        throws CommunicationException {

        final Set waiters;

        synchronized (this) {
          super.addWaiter(barrierIdentity);
          waiters = checkCondition();
        }

        if (waiters.size() > 0) {
          fireAwaken(waiters);
        }
      }
    };
  }
}