Spring Context 6.1.4 · org.springframework.context.support.SimpleThreadScope

A simple thread-backed Scope implementation.

Note

This thread scope is not registered by default in common contexts. Instead, you need to explicitly assign it to a scope key in your setup, either through org.springframework.beans.factory.config.ConfigurableBeanFactory#registerScope or through a org.springframework.beans.factory.config.CustomScopeConfigurer bean.

SimpleThreadScope does not clean up any objects associated with it. It is therefore typically preferable to use a request-bound scope implementation such as org.springframework.web.context.request.RequestScope in web environments, implementing the full lifecycle for scoped attributes (including reliable destruction).

For an implementation of a thread-based Scope with support for destruction callbacks, refer to Spring by Example.

Thanks to Eugene Kuleshov for submitting the original prototype for a thread scope!

Modifier and Type	Field and Description
private static final Log	logger
private final ThreadLocal<Map<String, Object>>	threadScope

Constructor Summary

Access	Constructor and Description
public	SimpleThreadScope()

Method Summary

Modifier and Type	Method and Description
public Object	get(String the name of the object to retrieve name, ObjectFactory<?> the `ObjectFactory` to use to create the scoped object if it is not present in the underlying storage mechanism objectFactory) Implements org.springframework.beans.factory.config.Scope.get. Return the object with the given name from the underlying scope, `creating it` if not found in the underlying storage mechanism.
public String	getConversationId() Implements org.springframework.beans.factory.config.Scope.getConversationId. Return the conversation ID for the current underlying scope, if any.
public void	registerDestructionCallback(String the name of the object to execute the destruction callback for name, Runnable the destruction callback to be executed. Note that the passed-in Runnable will never throw an exception, so it can safely be executed without an enclosing try-catch block. Furthermore, the Runnable will usually be serializable, provided that its target object is serializable as well. callback) Implements org.springframework.beans.factory.config.Scope.registerDestructionCallback. Register a callback to be executed on destruction of the specified object in the scope (or at destruction of the entire scope, if the scope does not destroy individual objects but rather only terminates in its entirety).
public Object	remove(String the name of the object to remove name) Implements org.springframework.beans.factory.config.Scope.remove. Remove the object with the given `name` from the underlying scope.
public Object	resolveContextualObject(String the contextual key key) Implements org.springframework.beans.factory.config.Scope.resolveContextualObject. Resolve the contextual object for the given key, if any.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

logger	back to summary
private static final Log logger

threadScope	back to summary
private final ThreadLocal<Map<String, Object>> threadScope

Constructor Detail

SimpleThreadScope	back to summary
public SimpleThreadScope()

Method Detail

get back to summary

get	back to summary
public Object get(String name, ObjectFactory<?> objectFactory) Implements org.springframework.beans.factory.config.Scope.get. Doc from org.springframework.beans.factory.config.Scope.get. Return the object with the given name from the underlying scope, `creating it` if not found in the underlying storage mechanism. This is the central operation of a Scope, and the only operation that is absolutely required. Parameters name:String the name of the object to retrieve objectFactory:ObjectFactory<?> the `ObjectFactory` to use to create the scoped object if it is not present in the underlying storage mechanism Returns:Object the desired object (never `null`) Annotations @Override

public Object get(String name, ObjectFactory<?> objectFactory)

Implements org.springframework.beans.factory.config.Scope.get.

Doc from org.springframework.beans.factory.config.Scope.get.

Return the object with the given name from the underlying scope, creating it if not found in the underlying storage mechanism.

This is the central operation of a Scope, and the only operation that is absolutely required.

Parameters

name:String: the name of the object to retrieve
objectFactory:ObjectFactory<?>: the ObjectFactory to use to create the scoped object if it is not present in the underlying storage mechanism

Returns:Object

the desired object (never null)

Annotations

@Override

getConversationId back to summary

getConversationId	back to summary
public String getConversationId() Implements org.springframework.beans.factory.config.Scope.getConversationId. Doc from org.springframework.beans.factory.config.Scope.getConversationId. Return the conversation ID for the current underlying scope, if any. The exact meaning of the conversation ID depends on the underlying storage mechanism. In the case of session-scoped objects, the conversation ID would typically be equal to (or derived from) the `session ID`; in the case of a custom conversation that sits within the overall session, the specific ID for the current conversation would be appropriate. Note: This is an optional operation. It is perfectly valid to return `null` in an implementation of this method if the underlying storage mechanism has no obvious candidate for such an ID. Returns:String the conversation ID, or `null` if there is no conversation ID for the current scope Annotations @Override

public String getConversationId()

Implements org.springframework.beans.factory.config.Scope.getConversationId.

Doc from org.springframework.beans.factory.config.Scope.getConversationId.

Return the conversation ID for the current underlying scope, if any.

The exact meaning of the conversation ID depends on the underlying storage mechanism. In the case of session-scoped objects, the conversation ID would typically be equal to (or derived from) the session ID; in the case of a custom conversation that sits within the overall session, the specific ID for the current conversation would be appropriate.

Note: This is an optional operation. It is perfectly valid to return null in an implementation of this method if the underlying storage mechanism has no obvious candidate for such an ID.

Returns:String

the conversation ID, or null if there is no conversation ID for the current scope

Annotations

@Override

registerDestructionCallback back to summary

registerDestructionCallback	back to summary
public void registerDestructionCallback(String name, Runnable callback) Implements org.springframework.beans.factory.config.Scope.registerDestructionCallback. Doc from org.springframework.beans.factory.config.Scope.registerDestructionCallback. Register a callback to be executed on destruction of the specified object in the scope (or at destruction of the entire scope, if the scope does not destroy individual objects but rather only terminates in its entirety). Note: This is an optional operation. This method will only be called for scoped beans with actual destruction configuration (DisposableBean, destroy-method, DestructionAwareBeanPostProcessor). Implementations should do their best to execute a given callback at the appropriate time. If such a callback is not supported by the underlying runtime environment at all, the callback must be ignored and a corresponding warning should be logged. Note that 'destruction' refers to automatic destruction of the object as part of the scope's own lifecycle, not to the individual scoped object having been explicitly removed by the application. If a scoped object gets removed via this facade's `remove(String)` method, any registered destruction callback should be removed as well, assuming that the removed object will be reused or manually destroyed. Parameters name:String the name of the object to execute the destruction callback for callback:Runnable the destruction callback to be executed. Note that the passed-in Runnable will never throw an exception, so it can safely be executed without an enclosing try-catch block. Furthermore, the Runnable will usually be serializable, provided that its target object is serializable as well. Annotations @Override

public void registerDestructionCallback(String name, Runnable callback)

Implements org.springframework.beans.factory.config.Scope.registerDestructionCallback.

Doc from org.springframework.beans.factory.config.Scope.registerDestructionCallback.

Register a callback to be executed on destruction of the specified object in the scope (or at destruction of the entire scope, if the scope does not destroy individual objects but rather only terminates in its entirety).

Note: This is an optional operation. This method will only be called for scoped beans with actual destruction configuration (DisposableBean, destroy-method, DestructionAwareBeanPostProcessor). Implementations should do their best to execute a given callback at the appropriate time. If such a callback is not supported by the underlying runtime environment at all, the callback must be ignored and a corresponding warning should be logged.

Note that 'destruction' refers to automatic destruction of the object as part of the scope's own lifecycle, not to the individual scoped object having been explicitly removed by the application. If a scoped object gets removed via this facade's remove(String) method, any registered destruction callback should be removed as well, assuming that the removed object will be reused or manually destroyed.

Parameters

name:String: the name of the object to execute the destruction callback for
callback:Runnable: the destruction callback to be executed. Note that the passed-in Runnable will never throw an exception, so it can safely be executed without an enclosing try-catch block. Furthermore, the Runnable will usually be serializable, provided that its target object is serializable as well.

Annotations

@Override

remove back to summary

remove	back to summary
public Object remove(String name) Implements org.springframework.beans.factory.config.Scope.remove. Doc from org.springframework.beans.factory.config.Scope.remove. Remove the object with the given `name` from the underlying scope. Returns `null` if no object was found; otherwise returns the removed `Object`. Note that an implementation should also remove a registered destruction callback for the specified object, if any. It does, however, not need to execute a registered destruction callback in this case, since the object will be destroyed by the caller (if appropriate). Note: This is an optional operation. Implementations may throw `UnsupportedOperationException` if they do not support explicitly removing an object. Parameters name:String the name of the object to remove Returns:Object the removed object, or `null` if no object was present Annotations @Override @Nullable

public Object remove(String name)

Implements org.springframework.beans.factory.config.Scope.remove.

Doc from org.springframework.beans.factory.config.Scope.remove.

Remove the object with the given name from the underlying scope.

Returns null if no object was found; otherwise returns the removed Object.

Note that an implementation should also remove a registered destruction callback for the specified object, if any. It does, however, not need to execute a registered destruction callback in this case, since the object will be destroyed by the caller (if appropriate).

Note: This is an optional operation. Implementations may throw UnsupportedOperationException if they do not support explicitly removing an object.

Parameters

name:String: the name of the object to remove

Returns:Object

the removed object, or null if no object was present

Annotations

@Override
@Nullable

resolveContextualObject back to summary

resolveContextualObject	back to summary
public Object resolveContextualObject(String key) Implements org.springframework.beans.factory.config.Scope.resolveContextualObject. Doc from org.springframework.beans.factory.config.Scope.resolveContextualObject. Resolve the contextual object for the given key, if any. E.g. the HttpServletRequest object for key "request". Parameters key:String the contextual key Returns:Object the corresponding object, or `null` if none found Annotations @Override @Nullable

public Object resolveContextualObject(String key)

Implements org.springframework.beans.factory.config.Scope.resolveContextualObject.

Doc from org.springframework.beans.factory.config.Scope.resolveContextualObject.

Resolve the contextual object for the given key, if any. E.g. the HttpServletRequest object for key "request".

Parameters

key:String: the contextual key

Returns:Object

the corresponding object, or null if none found

Annotations

@Override
@Nullable

public Class SimpleThreadScope

Field Summary

Constructor Summary

Method Summary

Field Detail

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Method Detail