| org.mule.api.ThreadSafeAccess
All known Subclasses: org.mule.transport.AbstractMessageAdapter, org.mule.DefaultMuleMessage, org.mule.DefaultMuleEvent,
| ThreadSafeAccess | | public interface ThreadSafeAccess (Code) | | Interface implemented by message-related objects that avoid exposing mutable data to multiple threads
by providing immutable copies. This interface is optional - it is an implementation detail that is
tested for dynamically and used only if available.
To avoid "scribbling" where several threads change state within in a single method (typically
in inconsistent ways, causing subtle and intermittent errors) we use the following access policy for
message related objects:
- A new object is "unbound" and "mutable".
- An object is "bound" to the first thread that calls the object after it is created.
- A "mutable" object can be modified only by the thread to which it is bound.
- An object is "sealed" (no longer "mutable") when it is accessed by a thread other than the
thread to which it is "bound". It is an error to attempt to change a "sealed" object.
In practice this means that objects are initially mutable, but become immutable once they are
shared.
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| Field Summary | |
| final boolean | READ
| | final boolean | WRITE
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| Method Summary | |
| void | assertAccess(boolean write)
This method may be called before data in the object are accessed. | | ThreadSafeAccess | newThreadCopy()
| | void | resetAccessControl()
This method should ONLY be used in the construction of composite ThreadSafeAccess instances.
For example, a ThreadSafeAccess MuleEvent contains a ThreadSafeAccess MessageAdapter. |
| WRITE | | final boolean WRITE(Code) | | |
| assertAccess | | void assertAccess(boolean write)(Code) | | This method may be called before data in the object are accessed. It should verify that the
access policy is followed correctly (if not, a runtime exception may be thrown).
Parameters:
write - True if the access will mutate values. |
| newThreadCopy | | ThreadSafeAccess newThreadCopy()(Code) | | A new instance of the implementing class, unbound to any thread and mutable. |
| resetAccessControl | | void resetAccessControl()(Code) | | This method should ONLY be used in the construction of composite ThreadSafeAccess instances.
For example, a ThreadSafeAccess MuleEvent contains a ThreadSafeAccess MessageAdapter. During
the construction of the event, the message adapter may be bound to the contructing thread.
Calling this method releases that binding so that the event as a whole can be passed to a new
thread unbound.
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