Class ORBInitializerHelper
- java.lang.Object
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- org.omg.PortableInterceptor.ORBInitializerHelper
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public abstract class ORBInitializerHelper extends java.lang.Object
Facilitates interceptor registration and ORB initialization.Interceptors are intended to be a means by which ORB services gain access to ORB processing, effectively becoming part of the ORB. Since Interceptors are part of the ORB, when
ORB.init
returns an ORB, the Interceptors shall have been registered. Interceptors cannot be registered on an ORB after it has been returned by a call toORB.init
.An Interceptor is registered by registering an associated
ORBInitializer
object which implements theORBInitializer
interface. When an ORB is initializing, it shall call each registeredORBInitializer
, passing it anORBInitInfo
object which is used to register its Interceptor.Registering ORB Initializers in Java
ORBInitializers are registered via Java ORB properties.
The property names are of the form:
whereorg.omg.PortableInterceptor.ORBInitializerClass.<Service>
<Service>
is the string name of a class which implements
To avoid name collisions, the reverse DNS name convention should be used. For example, if company X has three initializers, it could define the following properties:org.omg.PortableInterceptor.ORBInitializer
org.omg.PortableInterceptor.ORBInitializerClass.com.x.Init1
org.omg.PortableInterceptor.ORBInitializerClass.com.x.Init2
org.omg.PortableInterceptor.ORBInitializerClass.com.x.Init3
org.omg.PortableInterceptor.ORBInitializerClass
shall be collected, the<Service>
portion of each property shall be extracted, an object shall be instantiated with the<Service>
string as its class name, and thepre_init
andpost_init
methods shall be called on that object. If there are any exceptions, the ORB shall ignore them and proceed.Example
A client-side logging service written by company X, for example, may have the following ORBInitializer implementation:
package com.x.logging; import org.omg.PortableInterceptor.Interceptor; import org.omg.PortableInterceptor.ORBInitializer; import org.omg.PortableInterceptor.ORBInitInfo; public class LoggingService implements ORBInitializer { void pre_init( ORBInitInfo info ) { // Instantiate the Logging Service s Interceptor. Interceptor interceptor = new LoggingInterceptor(); // Register the Logging Service s Interceptor. info.add_client_request_interceptor( interceptor ); } void post_init( ORBInitInfo info ) { // This service does not need two init points. } }
To run a program calledMyApp
using this logging service, the user could type:java -Dorg.omg.PortableInterceptor.ORBInitializerClass.com.x.Logging.LoggingService MyApp
Notes about Registering Interceptors
Request Interceptors are registered on a per-ORB basis.
To achieve virtual per-object Interceptors, query the policies on the target from within the interception points to determine whether they should do any work.
To achieve virtual per-POA Interceptors, instantiate each POA with a different ORB. While Interceptors may be ordered administratively, there is no concept of order with respect to the registration of Interceptors. Request Interceptors are concerned with service contexts. Service contexts have no order, so there is no purpose for request Interceptors to have an order. IOR Interceptors are concerned with tagged components. Tagged components also have no order, so there is no purpose for IOR Interceptors to have an order.
Registration code should avoid using the ORB (i.e., calling
ORB.init
with the providedorb_id
). Since registration occurs during ORB initialization, results of invocations on this ORB while it is in this state are undefined.- See Also:
ORBInitInfo
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Field Summary
Fields Modifier and Type Field Description private static TypeCode
__typeCode
private static java.lang.String
_id
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Constructor Summary
Constructors Constructor Description ORBInitializerHelper()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static ORBInitializer
extract(Any a)
static java.lang.String
id()
static void
insert(Any a, ORBInitializer that)
static ORBInitializer
narrow(Object obj)
static ORBInitializer
read(InputStream istream)
static TypeCode
type()
static ORBInitializer
unchecked_narrow(Object obj)
static void
write(OutputStream ostream, ORBInitializer value)
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Field Detail
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_id
private static java.lang.String _id
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__typeCode
private static TypeCode __typeCode
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Method Detail
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insert
public static void insert(Any a, ORBInitializer that)
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extract
public static ORBInitializer extract(Any a)
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type
public static TypeCode type()
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id
public static java.lang.String id()
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read
public static ORBInitializer read(InputStream istream)
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write
public static void write(OutputStream ostream, ORBInitializer value)
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narrow
public static ORBInitializer narrow(Object obj)
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unchecked_narrow
public static ORBInitializer unchecked_narrow(Object obj)
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