Java tutorial
/** * Copyright (C) 2014 Dasasian (damith@dasasian.com) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.dasasian.chok.testutil.server.sleep; import org.apache.hadoop.ipc.VersionedProtocol; /** * The public interface for the back end of a dummy server that just * sleeps for a while then returns null. Used for testing. */ public interface ISleepServer extends VersionedProtocol { /** * Sleep for the given number of milliseconds, +- a random delta. * * @param msec How long each node should sleep for. * @param delta The maximum size of the delta (msec) to add or remove * from the specified time. The node will choose an evenly distributed * random sleep time from msec-delta to msec+delta. * @param shards Which shards to use. This is only for testing. The sleep * happens on a per-node basis. If invalid shards are passed in, an * IllegalArgumentException is thrown. Otherwise this parameter is ignored. * No checking is done if the value is null. * @return the number of shards used (note: sleeping is only done once). * @throws IllegalArgumentException if invalid shard names are passed in. */ public int sleep(long msec, int delta, String[] shards) throws IllegalArgumentException; }