Changes

* The middle dot character <code>[httphttps://www.fileformat.info/info/unicode/char/b7/index.htm ·]</code> (&amp;#xB7;, a valid character in XQuery names, but not in Java) can be used to append exact Java parameter types to the function name. Class types must be referenced by their full path.

[httphttps://www.w3.org/TR/xpath-functions-3031/#properties-of-functions function properties]. ==Updates== The {{Code|@Updating}} annotation can be applied to mark Java functions that perform write or update operations: <syntaxhighlight lang="java"> @Updating public void backup() { // ... }</syntaxhighlight> An XQuery expression will be handled as an [[XQuery Update#Updating Expressions|updating expression]] if it calls an updating Java function. In contrast to XQuery update operations, the Java code will immediately be executed, but the result will be cached as if {{Function|Update|update:output}} was called. The annotation is particularly helpful if combined with a lock annotation.

By default, a Java function will be executed in parallel with other code. However, if If a Java function performs sensitive write operations, it is advisable to explicitly lock the code. This  ===Java Locks=== Java provides a handful of mechanism to control the execution of code. The concurrent execution of functions can be realized via locking annotationsavoided with the {{Code|synchronized}} keyword. For more complex scenarios, Lock and Semaphor and Atomic classes exist. ===XQuery Locks=== If you want to synchronize the execution of your code with BaseX locks, you can take advantage of the {{Code|@Lock}} annotation:

@Lock(write = { "HEAVYIO" }) public void writeread() {

@Updating @Lock(read = { "HEAVYIO" }) public void readwrite() {

If an XQuery expression is run which calls the Java invokes {{Code|write()}} function, every any other query that calls call {{Code|write()}} or {{Code|read()}} needs to wait for the query to be finished. If a query calls the The {{Code|read()}} function, can be run in parallel; only those queries are queued that call {{Code|write()}}, because this function is only annotated with a {{Code|read}} lock.  More details on parallel query execution concurrent querying can be found in the article on [[Transaction Management]].