com.neurosys.scribble.proxy

Class ScriptableInterceptor<SERVICE_TYPE>

java.lang.Object

com.neurosys.scribble.proxy.ScriptableInterceptor<SERVICE_TYPE>

All Implemented Interfaces:

org.aopalliance.aop.Advice, org.aopalliance.intercept.Interceptor, org.aopalliance.intercept.MethodInterceptor

public class ScriptableInterceptor<SERVICE_TYPE>
extends Object
implements org.aopalliance.intercept.MethodInterceptor

Since scripting is all about making things more fluid and dynamic, it would be a shame to have to create classes that ingest scripts and hard code conventions. This class creates an AOP MethodInterceptor; that will allow any existing Service to also have a Script version (using AdapterService)
If the script version exists or is configured with the Proxy (assumed configured via Spring-AOP), then it will delegate all intercepted calls to the Script else it will allow default execution.

Note: The following reasons exist for creating a proxy:

• The script implementation does not have to extend the default always
• Since scripts can be un-tested and susceptible to errors, one can rely on the default method in case of method invocation failure. Though functionally this is questionable.
• One can always use the Scripts from the AdapterService directly also; however this provides a one size fits all way of directly script-a-lizing existing services without need for additional code (for the Lazy man who loves it short!) :)
• This is a MethodInterceptor intended to be used in org.springframework.aop.framework.ProxyFactoryBean. This allows multiple other interceptors to be configured, and provides additional configuration level flexibility.

Author:

Arjun Dhar

Constructor Summary

Constructors

Constructor and Description
ScriptableInterceptor()

Method Summary

Modifier and Type	Method and Description
String	getAdapterAlias() The Adapter alias to fetch the real adapter from the {@link #adapterService
AdapterService	getAdapterService() The AdapterService to invoke the script.
SERVICE_TYPE	getDefaultService() The default target service if Scripting not available
Object	invoke(org.aopalliance.intercept.MethodInvocation invocation)
boolean	isProoceedToOriginalInFailure() If there is a failure in the adapter then only proceed to Original service If true, will require defaultService to exist (not null)
void	setAdapterAlias(String adapterAlias) The Adapter alias to fetch the real adapter from the {@link #adapterService
void	setAdapterService(AdapterService adapterService) The AdapterService to invoke the script.
void	setDefaultService(SERVICE_TYPE defaultService) The default target service if Scripting not available
void	setProoceedToOriginalInFailure(boolean prooceedToOriginalInFailure) If there is a failure in the adapter then only proceed to Original service If true, will require defaultService to exist (not null)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ScriptableInterceptor

public ScriptableInterceptor()

Method Detail

invoke

public Object invoke(org.aopalliance.intercept.MethodInvocation invocation)
              throws Throwable

Specified by:

invoke in interface org.aopalliance.intercept.MethodInterceptor

Throws:

Throwable

isProoceedToOriginalInFailure

public boolean isProoceedToOriginalInFailure()

If there is a failure in the adapter then only proceed to Original service
If true, will require defaultService to exist (not null)

Default value:

false

setProoceedToOriginalInFailure

public void setProoceedToOriginalInFailure(boolean prooceedToOriginalInFailure)

If there is a failure in the adapter then only proceed to Original service
If true, will require defaultService to exist (not null)

Default value:

false

getDefaultService

public SERVICE_TYPE getDefaultService()

The default target service if Scripting not available

Can be null:

true - if null, will throw an Exception. Useful if we do not want to risk alternate strategy and want to focus only on the primary strategy provided by the script.

setDefaultService

public void setDefaultService(SERVICE_TYPE defaultService)

The default target service if Scripting not available

Can be null:

true - if null, will throw an Exception. Useful if we do not want to risk alternate strategy and want to focus only on the primary strategy provided by the script.

getAdapterService

public AdapterService getAdapterService()

The AdapterService to invoke the script. This class will intercept the original call to pass it to the Adapter.

Can be null:

false

setAdapterService

public void setAdapterService(AdapterService adapterService)

The AdapterService to invoke the script. This class will intercept the original call to pass it to the Adapter.

Can be null:

false

getAdapterAlias

public String getAdapterAlias()

The Adapter alias to fetch the real adapter from the {@link #adapterService

Can be null:

false

setAdapterAlias

public void setAdapterAlias(String adapterAlias)

The Adapter alias to fetch the real adapter from the {@link #adapterService

Can be null:

false