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Coding in Kotlin, want a thread-safe List as described here: java concurrent Array List access
It seems Collections.kt does not have this function. Are Kotlin's mutable lists already threadsafe ? If not, how do I accomplish this ?
Thanks.
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There is no thread-safety guarantee for the collections returned by mutableMapOf ( MutableMap ), mutableListOf ( MutableList ), or mutableSetOf ( MutableSet ).
A MessageService object is effectively immutable since its state can't change after its construction. So, it's thread-safe. Moreover, if MessageService were actually mutable, but multiple threads only have read-only access to it, it's thread-safe as well.
The synchronizedList() method of java. util. Collections class is used to return a synchronized (thread-safe) list backed by the specified list. In order to guarantee serial access, it is critical that all access to the backing list is accomplished through the returned list.
If I try to use the Java List a warning message comes up "This class shouldn't be used in Kotlin..."
Java lists (and other collections) are mapped types in Kotlin. So you can use Collections.synchronizedList, and it takes and returns a Kotlin List or MutableList.
OTOH, synchronizedList is rarely what you actually want: it works for single method calls, but anything else must be synchronized manually.
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