2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.protocol.framework;
10 import io.netty.util.concurrent.Future;
13 * Interface exposed by a reconnection strategy provider. A reconnection
14 * strategy decides whether to attempt reconnection and when to do that.
16 * The proper way of using this API is such that when a connection attempt
17 * has failed, the user will call scheduleReconnect() to obtain a future,
18 * which tracks schedule of the next connect attempt. The user should add its
19 * own listener to be get notified when the future is done. Once the
20 * the notification fires, user should examine the future to see whether
21 * it is successful or not. If it is successful, the user should immediately
22 * initiate a connection attempt. If it is unsuccessful, the user must
23 * not attempt any more connection attempts and should abort the reconnection
26 public interface ReconnectStrategy {
28 * Query the strategy for the connect timeout.
30 * @return connect try timeout in milliseconds, or
31 * 0 for infinite (or system-default) timeout
32 * @throws Exception if the connection should not be attempted
34 int getConnectTimeout() throws Exception;
37 * Schedule a connection attempt. The precise time when the connection
38 * should be attempted is signaled by successful completion of returned
41 * @param cause Cause of previous failure
42 * @return a future tracking the schedule, may not be null
43 * @throws IllegalStateException when a connection attempt is currently
46 Future<Void> scheduleReconnect(Throwable cause);
49 * Reset the strategy state. Users call this method once the reconnection
52 void reconnectSuccessful();