java - syslog4j 在 rsyslog 重新启动时停止记录

Question

rsyslog 守护进程重启后，syslog4j 0.9.46不重启java进程就不能再成功写入syslog。没有异常被抛出，我看不出有什么办法可以通过 API 检查日志记录是否仍在工作。有什么方法可以让 syslog4j 从 rsyslog 重启中恢复，或者至少抛出一个异常以便可以手动重启连接？

示例代码:

import java.util.Scanner;

import org.productivity.java.syslog4j.SyslogConstants;
import org.productivity.java.syslog4j.SyslogIF;
import org.productivity.java.syslog4j.impl.unix.socket.UnixSocketSyslog;
import org.productivity.java.syslog4j.impl.unix.socket.UnixSocketSyslogConfig;


public class SysLogging {

    public static void main(String[] args) {
        UnixSocketSyslogConfig cfg = new UnixSocketSyslogConfig();
        cfg.setFacility(SyslogConstants.FACILITY_LOCAL1);
        cfg.removeAllMessageModifiers();
        cfg.setIdent(null);
        cfg.setThrowExceptionOnWrite(true);
        cfg.setWriteRetries(5);
        SyslogIF log = new UnixSocketSyslog();
        log.initialize(SyslogConstants.UNIX_SOCKET, cfg);

        Scanner scanner = new Scanner(System.in);
        System.out.println("type quit to quit, anything else to log");
        String line = scanner.nextLine();
        while(!line.equals("quit")) {
            log.info(line);
            System.out.println("type quit to quit, anything else to log");
            line = scanner.nextLine();
        }
        scanner.close();
    }
}

在 rsyslog 重新启动之前，上面的代码可以正常工作。那时，系统日志中不再出现任何消​​息，尽管一切似乎都正常。

Answer 1

类似于此的 Hack 应该有所帮助:

    SyslogIF log = new UnixSocketSyslog() {
        @Override
        protected void write(int level, byte[] message) throws SyslogRuntimeException {
            if (this.fd == -1)
                connect();
            if (this.fd == -1)
                return;
            ByteBuffer byteBuffer = ByteBuffer.wrap(message);
            int ret = this.libraryInstance.write(this.fd,byteBuffer,message.length);
            if (ret < 0) {
                shutdown();
                connect();
                if (this.fd == -1)
                    return;
                ret = this.libraryInstance.write(this.fd,byteBuffer,message.length);
            }
        }
    };