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package com.juick.server.component;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.PingMessage;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.inject.Inject;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicBoolean;
@Component
public class JuickServerComponent extends TextWebSocketHandler {
private static Logger logger = LoggerFactory.getLogger(JuickServerComponent.class);
@Inject
private ApplicationEventPublisher applicationEventPublisher;
@Inject
private ObjectMapper jsonMapper;
private WebSocketSession session;
private final AtomicBoolean closeFlag = new AtomicBoolean(false);
@PostConstruct
public void init() {
closeFlag.set(false);
}
@Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
logger.info("WebSocket connected");
this.session = session;
}
@Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
logger.info("WebSocket disconnected with code {}: {}", status.getCode(), status.getReason());
applicationEventPublisher.publishEvent(new DisconnectedEvent(this));
}
@Override
protected void handleTextMessage(WebSocketSession session, TextMessage text) throws Exception {
com.juick.Message jmsg = jsonMapper.readValue(text.asBytes(), com.juick.Message.class);
if (logger.isInfoEnabled()) // prevent writeValueAsString execution if logger disabled
logger.info("got jmsg: {}", jsonMapper.writeValueAsString(jmsg));
if (!closeFlag.get()) {
applicationEventPublisher.publishEvent(new MessageEvent(this, jmsg));
}
}
@Scheduled(fixedRate = 30000, initialDelay = 30000)
public void ping() throws IOException {
if (session != null && session.isOpen()) {
logger.debug("Sending WebSocket ping");
session.sendMessage(new PingMessage());
} else if (!closeFlag.get()) {
applicationEventPublisher.publishEvent(new DisconnectedEvent(this));
}
}
@PreDestroy
public void close() {
closeFlag.set(true);
}
}
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