Hello,
I am playing with "bean binding" on bean component. I know, that I can solve my
requirements by another way.
But anyway I think, that my "syntetic" example doesn't work how I expect (I
tested it with Camel 2.11.2, 2.12.1).
I have a "streamBodyBindingBean" bean with this method:
public void bodyBinding(InputStream in) throws IOException {
int byteCount = 0;
int c;
while((c = in.read()) != -1)
byteCount++;
System.out.println("ByteCount: " + byteCount);
}
And this route:
<route id="" trace="true">
<from uri="direct://body-input-stream-binding-in"/>
<to uri="bean://streamBodyBindingBean?method=bodyBinding(${body})"/>
<!-- to uri="bean://isBodyBindingBean"/-->
<to uri="mock://body-input-stream-binding-out"/>
</route>
Here is a way how I send exchange from test stuff:
ByteArrayInputStream in = new ByteArrayInputStream(
"Small body, which I want to bind as InputStream".getBytes("UTF-8")
);
Exchange exchange = createExchangeWithBody(in);
exchange.getIn().setHeader("testHeader", "testHeader");
exchange.setPattern(ExchangePattern.InOnly);
template.send("direct://body-input-stream-binding-in", exchange);
In this case I got a sysout message: "ByteCount: 0".
When I used the commented variant in route, I got expected result: "ByteCount:
47", => is it an ${body} evaluation problem?
I think that the reason is MethodInfo class, line 526 (with strange comment for
me):
// the parameter value was not already valid, but since the simple language
have evaluated the expression
// which may change the parameterValue, so we have to check it again to see if
its now valid
exp = exchange.getContext().getTypeConverter().convertTo(String.class,
parameterValue);
// String values from the simple language is always valid
if (!valid) {
...
}
The line after "strange" comment caused that my "InputStream" is transformed
into String (what can be a problem in case of "big" InputStream).
The question is, why this line isn't in "if(!valid)" block? I am unable to
decide, if it is a problem, which should be reported to JIRA or
I only don't understand how bean binding should work or if I have only
"stupid/incorrect" example.
This i a reason, why I ask first here.
Thank you for any feedback.
Radek Kraus.
