ReliableHashMap<K,V>.containsKeyAsync 方法
定义
重载
| containsKeyAsync(Transaction txn, K key) |
Tests if the specified object is a key in this table.
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| containsKeyAsync(Transaction txn, K key, Duration timeout, CancellationToken cancellationToken) |
Tests if the specified object is a key in this table.
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| containsKeyAsync(Transaction txn, K key, LockMode lockMode) |
Tests if the specified object is a key in this table.
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| containsKeyAsync(Transaction txn, K key, LockMode lockMode, Duration timeout, CancellationToken cancellationToken) |
Tests if the specified object is a key in this table.
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containsKeyAsync(Transaction txn, K key)
Tests if the specified object is a key in this table.
public CompletableFuture<Boolean> containsKeyAsync(Transaction txn, K key)参数
- txn
- Transaction
The transaction id associated with this operation.
- key
- K
possible key
返回
CompletableFuture with result true if the key is found in this Map, false otherwise. The future completes exceptionally with FabricException for fabric related failures.
例外
if key or txn is null.
containsKeyAsync(Transaction txn, K key, Duration timeout, CancellationToken cancellationToken)
Tests if the specified object is a key in this table.
public CompletableFuture<Boolean> containsKeyAsync(Transaction txn, K key, Duration timeout, CancellationToken cancellationToken)参数
- txn
- Transaction
The transaction id associated with this operation.
- key
- K
possible key
- timeout
- Duration
the timeout for the operation to complete. Default timeout(4 seconds) will be used if null is passed.
- cancellationToken
- CancellationToken
CancellationToken object to indicate the cancellation status of the operation.
返回
CompletableFuture with result true if the key is found in this Map, false otherwise. The future completes exceptionally with FabricException for fabric related failures.
例外
if key or txn is null.
containsKeyAsync(Transaction txn, K key, LockMode lockMode)
Tests if the specified object is a key in this table.
public CompletableFuture<Boolean> containsKeyAsync(Transaction txn, K key, LockMode lockMode)参数
- txn
- Transaction
The transaction id associated with this operation.
- key
- K
possible key
- lockMode
- LockMode
The lock mode to obtain while checking for presence of the key.
返回
CompletableFuture with result true if the key is found in this Map, false otherwise. The future completes exceptionally with FabricException for fabric related failures.
例外
if key or txn is null.
containsKeyAsync(Transaction txn, K key, LockMode lockMode, Duration timeout, CancellationToken cancellationToken)
Tests if the specified object is a key in this table.
public CompletableFuture<Boolean> containsKeyAsync(Transaction txn, K key, LockMode lockMode, Duration timeout, CancellationToken cancellationToken)参数
- txn
- Transaction
The transaction id associated with this operation.
- key
- K
possible key
- lockMode
- LockMode
The lock mode to obtain while checking for presence of the key.
- timeout
- Duration
the timeout for the operation to complete. Default timeout(4 seconds) will be used if null is passed.
- cancellationToken
- CancellationToken
CancellationToken object to indicate the cancellation status of the operation.
返回
CompletableFuture with result true if the key is found in this Map, false otherwise. The future completes exceptionally with FabricException for fabric related failures.
例外
if key or txn is null.