尝试在骆驼中使用 netty 编写大型传输时出现 TooLongFrameException 异常。如果不进行一些认真的重构,我就无法真正缩小交换的规模。
作为一种解决方法,我明确指定了一个具有更大估计长度的 ObjectEncoder。但是,它不会自动将对象转换回其本机形式。我必须在骆驼路线上调用 convertBodyTo(),这需要事先知道类的类型。
这是一个例子:
public static void main(String[] args) throws Exception{
JndiContext registry=new JndiContext();
//Workaround #1: explicitly specify the encoder so we can increase the estinatedLength.
registry.bind("encoder", new ObjectEncoder(99999999));
CamelContext context=new DefaultCamelContext(registry);
context.addRoutes(new RouteBuilder() {
@Override
public void configure() throws Exception {
//This is the receiving end of the large data.
from("netty:tcp://0.0.0.0:9002?transferExchange=true&encoder=#encoder")
//At this point the body is a BigEndianHeapChannelBuffer not a String
.to("log:nettyin?level=INFO")
.bean(System.out, "println")
//Workaround #2: explicitly convert the body to the expected class. What do you do if you want several possible classes?
.convertBodyTo(String.class)
//Now we have a String as the body.
.to("log:nettyin.string?level=INFO")
.bean(System.out, "println");
//Use this endpoint to send large data.
from("direct:start")
.to("log:start?level=INFO")
.to("netty:tcp://localhost:9002?transferExchange=true&encoder=#encoder");
}
});
context.start();
final ProducerTemplate template = context.createProducerTemplate();
String s=org.apache.commons.lang.StringUtils.repeat("x", 1133461);
template.sendBody("direct:start", s);
context.stop();
}
有没有办法不显式调用 convertBodyTo()?另外我如何处理泛型?例如 convertBodyTo(List.class) 不适用于 List<String>。我得到一个这样的例外:
原因:org.apache.camel.NoTypeConversionAvailableException:没有类型转换器可用于从类型:org.jboss.netty.buffer.BigEndianHeapChannelBuffer 转换为所需类型:java.util.ArrayList,值为 BigEndianHeapChannelBuffer(ridx=0,widx=422 , 上限 = 422) 在 org.apache.camel.impl.converter.BaseTypeConverterRegistry.mandatoryConvertTo(BaseTypeConverterRegistry.java:169) ~[camel-core-2.10.3.jar:2.10.3] 在 org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:99) ~[camel-core-2.10.3.jar:2.10.3] ...省略了40个常用框架