com.sleepycat.je.dbi

Class DbEnvPool

java.lang.Object

com.sleepycat.je.dbi.DbEnvPool

public class DbEnvPool
extends Object

Singleton collection of environments. Responsible for environment open and close, supporting this from multiple threads by synchronizing on the pool. To avoid multiple environment openings from being blocked by recovery in getEnvironment(), the EnvironmentImpl constructor is broken into two parts, with the second part (EnvironmentImpl.finishInit) doing the recovery. When synchronizing on two or more of the following objects the synchronization order must be as follows. Synchronization is not performed in constructors, of course, because no other thread can access the object. Synchronization order: Environment, DbEnvPool, EnvironmentImpl, Evictor

Method Summary

Modifier and Type	Method and Description
void	clear() For unit testing only.
Collection<EnvironmentImpl>	getEnvImpls()
EnvironmentImpl	getEnvironment(File envHome, EnvironmentConfig config, boolean checkImmutableParams, RepConfigProxy repConfigProxy) Find a single environment, used by Environment handles and by command line utilities.
static DbEnvPool	getInstance() Access the singleton instance.
int	getNSharedCacheEnvironments()
boolean	isOpen(File home)
void	setBeforeFinishInitHook(TestHook<EnvironmentImpl> hook)

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static DbEnvPool getInstance()

Access the singleton instance.

setBeforeFinishInitHook

public void setBeforeFinishInitHook(TestHook<EnvironmentImpl> hook)

getNSharedCacheEnvironments

public int getNSharedCacheEnvironments()

getEnvironment

public EnvironmentImpl getEnvironment(File envHome,
                                      EnvironmentConfig config,
                                      boolean checkImmutableParams,
                                      RepConfigProxy repConfigProxy)
                               throws EnvironmentNotFoundException,
                                      EnvironmentLockedException

Find a single environment, used by Environment handles and by command line utilities.

Returns:

a non-null EnvironmentImpl.

Throws:

EnvironmentNotFoundException

EnvironmentLockedException

clear

public void clear()

For unit testing only.

getEnvImpls

public Collection<EnvironmentImpl> getEnvImpls()

isOpen

public boolean isOpen(File home)