01: /*
02: * <copyright>
03: *
04: * Copyright 2002-2004 BBNT Solutions, LLC
05: * under sponsorship of the Defense Advanced Research Projects
06: * Agency (DARPA).
07: *
08: * You can redistribute this software and/or modify it under the
09: * terms of the Cougaar Open Source License as published on the
10: * Cougaar Open Source Website (www.cougaar.org).
11: *
12: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
13: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
14: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
15: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
16: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
17: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
18: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
22: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23: *
24: * </copyright>
25: */
26:
27: package org.cougaar.core.wp.resolver;
28:
29: import org.cougaar.core.component.Service;
30: import org.cougaar.core.mts.MessageAddress;
31:
32: /**
33: * This service is advertised by the {@link ClientTransport} for the
34: * {@link SelectManager} to send "ping" messages to white pages servers.
35: * <p>
36: * This API hides the MTS and messaging details. Also, it
37: * ensures that the client's return address is sent to the
38: * server, otherwise the server's reply message will be lost.
39: * <p>
40: * The service requestor must implement the Client API.
41: */
42: public interface PingService extends Service {
43:
44: /**
45: * Send a ping to a server.
46: */
47: void ping(MessageAddress addr, long deadline);
48:
49: interface Client {
50: /**
51: * Receive the answer to a modify request.
52: * <p>
53: * For now just the round-trip-time is passed back, but this
54: * could be enhanced to send back more info.
55: */
56: void pingAnswer(MessageAddress addr, long rtt);
57: }
58: }
|