我有以下代码段。如果RabbitMQ服务器掉线,则连接似乎返回null并建立新连接。我怀疑重复尝试重新连接服务器正在耗尽内存,但我不确定原因。如何处理丢失的连接(服务器不可用)?
public Connection getConnection( ) {
if (myConnection == null) {
start();
}
return myConnection;
}
private void start() {
log.debug("Building AMQP Connection");
ConnectionFactory factory = new ConnectionFactory();
String ipAddress = applicationConfiguration.getAMQPHost();
String user = applicationConfiguration.getAMQPUser();
String password = applicationConfiguration.getAMQPPassword();
String virtualHost = applicationConfiguration.getAMQPVirtualHost();
String port = applicationConfiguration.getAMQPPort();
try {
factory.setUsername(user);
factory.setPassword(password);
factory.setVirtualHost(virtualHost);
factory.setPort(Integer.parseInt(port));
factory.setHost(ipAddress);
myConnection = factory.newConnection();
}
catch (Exception e) {
log.error("Unable to initialise AMQP Connection.");
e.printStackTrace();
}
myConnection.addBlockedListener(new BlockedListener() {
public void handleBlocked(String reason) throws IOException {
// Connection is now blocked
log.warn("Message Server has blocked. It may be resource limitted.");
blocked = true;
}
public void handleUnblocked() throws IOException {
// Connection is now unblocked
log.warn("Message server is unblocked.");
blocked = false;
}
});
}
public Boolean isBlocked() {
return blocked;
}
代码是邮件系统的一部分,它将绑定的邮件重定向到传出的AMQP队列。每次接收到绑定消息(以每秒20到30的速率)时,都会调用getConnection方法。如果AMQP服务器已关闭,则仍会调用该方法,并尝试构建队列。它失败了,每次失败都会导致一个看似占用更多内存的异常。