前文已经讲了log4j2的AsyncAppender的实现【
看了这个图，应该很清楚AsyncLogger调用Disruptor，然后直接返回。至于
我们来看看AsyncLogger的调用流程，log.info()首先会调用抽象类AbstractLogger，然后调用了Logger的logMessage。
//Logger.java @Override public void logMessage(final String fqcn, final Level level, final Marker marker, final Message message, final Throwable t) { final Message msg = message == null ? new SimpleMessage(Strings.EMPTY) : message; final ReliabilityStrategy strategy = privateConfig.loggerConfig.getReliabilityStrategy(); strategy.log(this, getName(), fqcn, marker, level, msg, t); }
strategy.log是调用了ReliabilityStrategy接口，日志事件传递到适当的appender的对象的接口，然后调用了LoggerConfig.log()方法，来创建有关记录消息的上下文信息。
//LoggerConfig.java @PerformanceSensitive("allocation") public void log(final String loggerName, final String fqcn, final Marker marker, final Level level, final Message data, final Throwable t) { List<Property> props = null; if (!propertiesRequireLookup) { props = properties; } else { if (properties != null) { props = new ArrayList<>(properties.size()); final LogEvent event = Log4jLogEvent.newBuilder() .setMessage(data) .setMarker(marker) .setLevel(level) .setLoggerName(loggerName) .setLoggerFqcn(fqcn) .setThrown(t) .build(); for (int i = 0; i < properties.size(); i++) { final Property prop = properties.get(i); final String value = prop.isValueNeedsLookup() //
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