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Amazon ElastiCache Cluster Client is an enhanced Java library to connect to ElastiCache clusters. This client library has been built upon Spymemcached and is released under the Amazon Software License.

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/**
 * Copyright (C) 2006-2009 Dustin Sallings
 * Copyright (C) 2009-2011 Couchbase, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALING
 * IN THE SOFTWARE.
 */

package net.spy.memcached.auth;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;

import net.spy.memcached.KeyUtil;
import net.spy.memcached.MemcachedConnection;
import net.spy.memcached.MemcachedNode;
import net.spy.memcached.OperationFactory;
import net.spy.memcached.compat.SpyThread;
import net.spy.memcached.ops.Operation;
import net.spy.memcached.ops.OperationCallback;
import net.spy.memcached.ops.OperationStatus;

/**
 * A thread that does SASL authentication.
 */
public class AuthThread extends SpyThread {

  private final MemcachedConnection conn;
  private final AuthDescriptor authDescriptor;
  private final OperationFactory opFact;
  private final MemcachedNode node;

  public AuthThread(MemcachedConnection c, OperationFactory o,
      AuthDescriptor a, MemcachedNode n) {
    conn = c;
    opFact = o;
    authDescriptor = a;
    node = n;
    start();
  }

  @Override
  public void run() {
    OperationStatus priorStatus = null;
    final AtomicBoolean done = new AtomicBoolean();

    while (!done.get()) {
      final CountDownLatch latch = new CountDownLatch(1);
      final AtomicReference foundStatus =
          new AtomicReference();

      final OperationCallback cb = new OperationCallback() {
        public void receivedStatus(OperationStatus val) {
          // If the status we found was null, we're done.
          if (val.getMessage().length() == 0) {
            done.set(true);
            node.authComplete();
            getLogger().info("Authenticated to " + node.getSocketAddress());
          } else {
            foundStatus.set(val);
          }
        }

        public void complete() {
          latch.countDown();
        }
      };

      // Get the prior status to create the correct operation.
      final Operation op = buildOperation(priorStatus, cb);
      conn.insertOperation(node, op);

      try {
        latch.await();
        Thread.sleep(100);
      } catch (InterruptedException e) {
        // we can be interrupted if we were in the
        // process of auth'ing and the connection is
        // lost or dropped due to bad auth
        Thread.currentThread().interrupt();
        if (op != null) {
          op.cancel();
        }
        done.set(true); // If we were interrupted, tear down.
      }

      // Get the new status to inspect it.
      priorStatus = foundStatus.get();
      if (priorStatus != null) {
        if (!priorStatus.isSuccess()) {
          getLogger().warn(
              "Authentication failed to " + node.getSocketAddress());
        }
      }
    }
    return;
  }

  private Operation buildOperation(OperationStatus st, OperationCallback cb) {
    if (st == null) {
      return opFact.saslAuth(authDescriptor.getMechs(),
          node.getSocketAddress().toString(), null,
          authDescriptor.getCallback(), cb);
    } else {
      return opFact.saslStep(authDescriptor.getMechs(), KeyUtil.getKeyBytes(
          st.getMessage()), node.getSocketAddress().toString(), null,
          authDescriptor.getCallback(), cb);
    }
  }
}