Bean @Property injection
Imagine we have a bean implementation which involves property usage, specified in switchyard.xml component/composite properties.
It looks like this at the moment:
@Service(SomeService.class)
public class SomeServiceImpl implements SomeService {
@Property(name = "string-property")
String stringProperty;
@Property(name = "int-property")
String intProperty; //could be only String, but is integer semantically!
public void someServiceMethod() {
// there we should do
int intPropValue = 0;
try {
intPropValue = Integer.parseInt(intProperty);
} catch (Throwable t) {
intPropValue = SOME_DEFAULT_FOR_EXAMPLE;
}
}
}
This is not a good way, because properties are set only while deployment, but should be parsed (integer is simple examle, but there could be more complex) any time service is invoked.
I tried to achieve reading properties upon deployment via @PostConstruct
@Service(SomeService.class)
public class SomeServiceImpl implements SomeService {
@Property(name = "string-property")
String stringProperty;
@Property(name = "int-property")
String intProperty; //could be only String, but is integer semantically!
int intPropValue;
@PostConstruct
void init() {
try {
intPropValue = Integer.parseInt(intProperty);
} catch (Throwable t) {
intPropValue = SOME_DEFAULT_FOR_EXAMPLE;
}
}
public void someServiceMethod() {
//just use intPropValue
}
}
But no success, because it seems like they are injected after @PostConstruct.
So, the questions are:
1. Why not inject properties before @PostConstruct? They are not changing while bean is being invoked.
2. Are there any methods of extracting implementation configuration parameters anywhere but properties supported internally in SY?
Now I resolve this issue by using code:
@Service(SomeService.class)
public class SomeServiceImpl implements SomeService {
@Property(name = "string-property")
String stringProperty;
@Property(name = "int-property")
String intProperty; //could be only String, but is integer semantically!
int intPropValue;
private boolean init = false;
private void init() {
try {
intPropValue = Integer.parseInt(intProperty);
} catch (Throwable t) {
intPropValue = SOME_DEFAULT_FOR_EXAMPLE;
}
init = true;
}
public void someServiceMethod() {
if (!init) {
init()
}
}
}
