org.apache.flink.util

类 ResourceGuard

java.lang.Object

org.apache.flink.util.ResourceGuard

所有已实现的接口:

Serializable, AutoCloseable

public class ResourceGuard
extends Object
implements AutoCloseable, Serializable

This class is a guard for shared resources with the following invariants. The resource can be acquired by multiple clients in parallel through the acquireResource() call. As a result of the call, each client gets a ResourceGuard.Lease. The close() method of the lease releases the resources and reduces the client count in the ResourceGuard object. The protected resource should only be disposed once the corresponding resource guard is successfully closed, but the guard can only be closed once all clients that acquired a lease for the guarded resource have released it. Before this is happened, the call to close() will block until the zero-open-leases condition is triggered. After the resource guard is closed, calls to acquireResource() will fail with exception. Notice that, obviously clients are responsible to release the resource after usage. All clients are considered equal, i.e. there is only a global count maintained how many times the resource was acquired but not by whom.

另请参阅:

序列化表格

嵌套类概要

嵌套类

限定符和类型	类和说明
class	ResourceGuard.Lease A lease is issued by the ResourceGuard as result of calls to acquireResource().

构造器概要

构造器

构造器和说明
ResourceGuard()

方法概要

限定符和类型	方法和说明
ResourceGuard.Lease	acquireResource() Acquired access from one new client for the guarded resource.
void	close() Closed the resource guard.
void	closeInterruptibly()
void	closeUninterruptibly() If the current thread is interrupted while waiting for the close method to complete, then it will continue to wait.
int	getLeaseCount() Returns the current count of open leases.
boolean	isClosed() Returns true if the resource guard is closed, i.e. after close() was called.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

ResourceGuard

public ResourceGuard()

方法详细资料

acquireResource

public ResourceGuard.Lease acquireResource()
                                    throws IOException

Acquired access from one new client for the guarded resource.

抛出:

IOException - when the resource guard is already closed.

closeInterruptibly

public void closeInterruptibly()
                        throws InterruptedException

抛出:

InterruptedException

closeUninterruptibly

public void closeUninterruptibly()

If the current thread is interrupted while waiting for the close method to complete, then it will continue to wait. When the thread does return from this method its interrupt status will be set.

close

public void close()

Closed the resource guard. This method will block until all calls to acquireResource() have seen their matching call to releaseResource().

指定者:

close 在接口中 AutoCloseable

isClosed

public boolean isClosed()

Returns true if the resource guard is closed, i.e. after close() was called.

getLeaseCount

public int getLeaseCount()

Returns the current count of open leases.