folly::RequestContext

Synopsis

Declared in <folly/io/async/Request.h>

class RequestContext;

Name	Description
`RootIdInfo`	Describes the root id associated with a thread.
`State`	Internal state of a RequestContext.
`StaticContext`	Thread-local holder of the current request context.
`StaticContextAccessor`	Accessor that iterates the StaticContext of every thread.

Name	Description
`SetContextWatcherSig`	Signature for watcher callbacks invoked after a setContext.

Name	Description
`DoSetBehaviour`	Selects the behavior of doSetContextDataHelper.

Name	Description
`RequestContext` [constructor]	Constructors
`operator=`	Assignment operators
`clearContextData`	`clearContextData` overloads
`doSetContextDataHelper`	`doSetContextDataHelper` overloads
`getContextData`	`getContextData` overloads
`getRootId`	Returns the root id of this context.
`getThreadCachedContextData`	Returns cached context data for the token, keyed by a type tag.
`hasContextData`	`hasContextData` overloads
`onSet`	Invokes the onSet() callbacks of all held RequestData instances.
`onUnset`	Invokes the onUnset() callbacks of all held RequestData instances.
`overwriteContextData`	`overwriteContextData` overloads
`setContextData`	`setContextData` overloads
`setContextDataIfAbsent`	`setContextDataIfAbsent` overloads

Name	Description
`accessAllThreads`	Returns an accessor that pins the StaticContext of all threads.
`addSetContextWatcher`	Registers a watcher invoked on every context change.
`copyAsChild`	Copies a context as a child of the given one.
`copyAsRoot`	Copies a context as a new root context.
`create`	Creates a unique request context and sets it as the current context.
`get`	Returns the current context, or the default global request context.
`getRootIdsFromAllThreads`	Collects the root id information from all threads.
`saveContext`	Returns a shared pointer to the current context.
`setContext`	Sets the given context as current and returns the previous one.
`setShallowCopyContext`	Sets a shallow copy of the current context as current.
`try_get`	Returns the current context, if it has already been set, or nullptr.

Name	Description
`rootId_`	The root id; shallow copies keep a note of the root context.
`state_`	The internal state of this context.

Name	Description
`folly::ShallowCopyRequestContextScopeGuard`	This guard maintains all the RequestData pointers of the parent. This allows to overwrite a specific RequestData pointer for the scope's duration, without breaking others.