001/* 002 * Copyright 2002-2018 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.web.reactive.socket.adapter; 018 019import java.util.concurrent.atomic.AtomicIntegerFieldUpdater; 020 021import javax.websocket.Session; 022 023import org.apache.tomcat.websocket.WsSession; 024import reactor.core.publisher.MonoProcessor; 025 026import org.springframework.core.io.buffer.DataBufferFactory; 027import org.springframework.web.reactive.socket.HandshakeInfo; 028import org.springframework.web.reactive.socket.WebSocketSession; 029 030/** 031 * Spring {@link WebSocketSession} adapter for Tomcat's 032 * {@link javax.websocket.Session}. 033 * 034 * @author Violeta Georgieva 035 * @since 5.0 036 */ 037public class TomcatWebSocketSession extends StandardWebSocketSession { 038 039 private static final AtomicIntegerFieldUpdater<TomcatWebSocketSession> SUSPENDED = 040 AtomicIntegerFieldUpdater.newUpdater(TomcatWebSocketSession.class, "suspended"); 041 042 @SuppressWarnings("unused") 043 private volatile int suspended; 044 045 046 public TomcatWebSocketSession(Session session, HandshakeInfo info, DataBufferFactory factory) { 047 super(session, info, factory); 048 } 049 050 public TomcatWebSocketSession(Session session, HandshakeInfo info, DataBufferFactory factory, 051 MonoProcessor<Void> completionMono) { 052 053 super(session, info, factory, completionMono); 054 suspendReceiving(); 055 } 056 057 058 @Override 059 protected boolean canSuspendReceiving() { 060 return true; 061 } 062 063 @Override 064 protected void suspendReceiving() { 065 if (SUSPENDED.compareAndSet(this, 0, 1)) { 066 ((WsSession) getDelegate()).suspend(); 067 } 068 } 069 070 @Override 071 protected void resumeReceiving() { 072 if (SUSPENDED.compareAndSet(this, 1, 0)) { 073 ((WsSession) getDelegate()).resume(); 074 } 075 } 076 077}