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https://issues.apache.org/activemq/browse/CAMEL-655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43845#action_43845
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Aaron Mulder commented on CAMEL-655:
------------------------------------
A follow-up from Dave, my Jython guy. We'd obviously need to massage this a
bit if we were going to go this way, but it's an option.
-----------
It figures that I found Invocable right after I sent that out. This works:
args[0] should be the value you want for request.headers['foo']
args[1] should be the name of the script file
{code:java|title=JyScript.java}
import java.io.*;
import java.util.*;
import javax.script.*;
public class JyScript {
public static void main(String[] args) throws Exception {
final ScriptEngineManager manager = new ScriptEngineManager();
final ScriptEngine engine = manager.getEngineByName("jython");
final MyRequest request = new MyRequest(args[0]);
engine.put("request", request);
engine.eval(new BufferedReader(new FileReader(args[1])));
final Invocable invocable = (Invocable) engine;
Object result = invocable.invokeFunction("is_console_header_value",
"bar");
System.out.printf("Result is: %s", result);
}
}
class MyRequest {
private Map<String, String> headers;
public MyRequest(final String value) {
headers = new HashMap<String, String>();
headers.put("foo", value);
headers.put("other_key", "other_value");
}
public Map<String, String> getHeaders() {
return headers;
}
}
{code}
{code:title=my_func.py}
def is_console_header_value(val):
return request.headers['foo'] == val
{code}
> Jython Expressions always return null/false
> -------------------------------------------
>
> Key: CAMEL-655
> URL: https://issues.apache.org/activemq/browse/CAMEL-655
> Project: Apache Camel
> Issue Type: Bug
> Components: camel-script
> Affects Versions: 1.3.0, 1.4.0
> Environment: Jython 2.2.1, camel-script 1.3.0/1.4.0-SNAPSHOT, jython
> integration lib from java.net or logicblaze.com repo
> Reporter: Aaron Mulder
>
> A Jython expression used for example like this always returns null, which is
> now translated to false:
> from("...").choice().when().jython("some expression").to(...)
> For example, here's an expression that always evaluates to null/false:
> request.headers['foo'] == 'bar'
> To see this, look at the test PythonExpressionTest in the camel-script module.
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