Collections.SynchronizedMap(IDictionary) Method

Reference

Definition

Namespace:: Java.Util

Assembly:: Mono.Android.dll

Important

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Returns a synchronized (thread-safe) map backed by the specified map.

[Android.Runtime.Register("synchronizedMap", "(Ljava/util/Map;)Ljava/util/Map;", "")]
[Java.Interop.JavaTypeParameters(new System.String[] { "K", "V" })]
public static System.Collections.IDictionary SynchronizedMap (System.Collections.IDictionary m);

[<Android.Runtime.Register("synchronizedMap", "(Ljava/util/Map;)Ljava/util/Map;", "")>]
[<Java.Interop.JavaTypeParameters(new System.String[] { "K", "V" })>]
static member SynchronizedMap : System.Collections.IDictionary -> System.Collections.IDictionary

Parameters

m: IDictionary

the map to be "wrapped" in a synchronized map.

Returns

IDictionary

a synchronized view of the specified map.

Attributes: RegisterAttribute JavaTypeParametersAttribute

Remarks

Returns a synchronized (thread-safe) map backed by the specified map. In order to guarantee serial access, it is critical that <strong>all</strong> access to the backing map is accomplished through the returned map.

It is imperative that the user manually synchronize on the returned map when traversing any of its collection views via Iterator, Spliterator or Stream:

Map m = Collections.synchronizedMap(new HashMap());
                 ...
             Set s = m.keySet();  // Needn't be in synchronized block
                 ...
             synchronized (m) {  // Synchronizing on m, not s!
                 Iterator i = s.iterator(); // Must be in synchronized block
                 while (i.hasNext())
                     foo(i.next());
             }

Failure to follow this advice may result in non-deterministic behavior.

The returned map will be serializable if the specified map is serializable.

Java documentation for java.util.Collections.synchronizedMap(java.util.Map<K, V>).

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Applies to

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