DiqubeCatalystClient.java

/**
 * diqube: Distributed Query Base.
 *
 * Copyright (C) 2015 Bastian Gloeckle
 *
 * This file is part of diqube.
 *
 * diqube is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.diqube.consensus.internal;

import java.util.Deque;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentLinkedDeque;

import io.atomix.catalyst.transport.Address;
import io.atomix.catalyst.transport.Client;
import io.atomix.catalyst.transport.Connection;
import io.atomix.catalyst.transport.TransportException;
import io.atomix.catalyst.util.concurrent.ThreadContext;

/**
 * Diqubes Catalyst client that is used internally by copycat.
 * 
 * <p>
 * Manages a catalyst connection to another node.
 *
 * @author Bastian Gloeckle
 */
public class DiqubeCatalystClient implements Client {

  private DiqubeCatalystConnectionFactory factory;

  private Deque<DiqubeCatalystConnection> connections = new ConcurrentLinkedDeque<>();

  public DiqubeCatalystClient(DiqubeCatalystConnectionFactory factory) {
    this.factory = factory;
  }

  @Override
  public CompletableFuture<Connection> connect(Address address) {
    CompletableFuture<Connection> res = new CompletableFuture<>();

    try {
      DiqubeCatalystConnection con = factory.createDiqubeCatalystConnection(ThreadContext.currentContextOrThrow());
      con.openAndRegister(address);
      connections.add(con);
      // TODO #92 workaround as long as copycat pullrequest #76 is not merged.
      ThreadContext.currentContextOrThrow().executor().execute(() -> res.complete(con));
      // res.complete(con);
    } catch (TransportException e) {
      res.completeExceptionally(e);
    }

    return res;
  }

  @Override
  public CompletableFuture<Void> close() {
    while (!connections.isEmpty())
      connections.poll().close();
    CompletableFuture<Void> res = new CompletableFuture<>();
    res.complete(null);
    return res;
  }

}