001/** 002 * 003 * Copyright 2014-2018 Florian Schmaus 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.jivesoftware.smack; 018 019import java.lang.ref.WeakReference; 020import java.util.concurrent.ScheduledFuture; 021import java.util.concurrent.TimeUnit; 022 023import org.jivesoftware.smack.SmackException.NotLoggedInException; 024import org.jivesoftware.smack.util.Objects; 025 026public abstract class Manager { 027 028 final WeakReference<XMPPConnection> weakConnection; 029 030 public Manager(XMPPConnection connection) { 031 Objects.requireNonNull(connection, "XMPPConnection must not be null"); 032 033 weakConnection = new WeakReference<>(connection); 034 } 035 036 protected final XMPPConnection connection() { 037 return weakConnection.get(); 038 } 039 040 /** 041 * Get the XMPPConnection of this Manager if it's authenticated, i.e. logged in. Otherwise throw a {@link NotLoggedInException}. 042 * 043 * @return the XMPPConnection of this Manager. 044 * @throws NotLoggedInException if the connection is not authenticated. 045 */ 046 protected final XMPPConnection getAuthenticatedConnectionOrThrow() throws NotLoggedInException { 047 XMPPConnection connection = connection(); 048 if (!connection.isAuthenticated()) { 049 throw new NotLoggedInException(); 050 } 051 return connection; 052 } 053 054 protected static final ScheduledFuture<?> schedule(Runnable runnable, long delay, TimeUnit unit) { 055 return AbstractXMPPConnection.SCHEDULED_EXECUTOR_SERVICE.schedule(runnable, delay, unit); 056 } 057}