Spring Cloud Sleuth 覆盖Zipkin的自动配置

Spring Cloud Sleuth支持从2.1.0版开始将跟踪发送到多个跟踪系统。为了使它起作用，每个跟踪系统都需要具有Reporter<Span>和Sender。如果要覆盖提供的beans，则需要给它们指定一个特定的名称。为此，您可以分别使用ZipkinAutoConfiguration.REPORTER_BEAN_NAME和ZipkinAutoConfiguration.SENDER_BEAN_NAME。

@Configuration
protected static class MyConfig {

	@Bean(ZipkinAutoConfiguration.REPORTER_BEAN_NAME)
	Reporter<zipkin2.Span> myReporter() {
		return AsyncReporter.create(mySender());
	}

	@Bean(ZipkinAutoConfiguration.SENDER_BEAN_NAME)
	MySender mySender() {
		return new MySender();
	}

	static class MySender extends Sender {

		private boolean spanSent = false;

		boolean isSpanSent() {
			return this.spanSent;
		}

		@Override
		public Encoding encoding() {
			return Encoding.JSON;
		}

		@Override
		public int messageMaxBytes() {
			return Integer.MAX_VALUE;
		}

		@Override
		public int messageSizeInBytes(List<byte[]> encodedSpans) {
			return encoding().listSizeInBytes(encodedSpans);
		}

		@Override
		public Call<Void> sendSpans(List<byte[]> encodedSpans) {
			this.spanSent = true;
			return Call.create(null);
		}

	}

}