org.h2.store

类 FileLock

java.lang.Object

org.h2.store.FileLock

所有已实现的接口:

Runnable

public class FileLock
extends Object
implements Runnable

The file lock is used to lock a database so that only one process can write to it. It uses a cooperative locking protocol. Usually a .lock.db file is used, but locking by creating a socket is supported as well.

构造器概要

构造器

构造器和说明
FileLock(TraceSystem traceSystem, String fileName, int sleep) Create a new file locking object.

方法概要

限定符和类型	方法和说明
static FileLockMethod	getFileLockMethod(String method) Get the file locking method type given a method name.
String	getUniqueId()
Properties	load() Load the properties file.
void	lock(FileLockMethod fileLockMethod) Lock the file if possible.
void	run()
Properties	save() Save the lock file.
void	setProperty(String key, String value) Add or change a setting to the properties.
void	unlock() Unlock the file.

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

FileLock

public FileLock(TraceSystem traceSystem,
                String fileName,
                int sleep)

Create a new file locking object.

参数:

traceSystem - the trace system to use

fileName - the file name

sleep - the number of milliseconds to sleep

方法详细资料

lock

public void lock(FileLockMethod fileLockMethod)

Lock the file if possible. A file may only be locked once.

参数:

fileLockMethod - the file locking method to use

抛出:

DbException - if locking was not successful

unlock

public void unlock()

Unlock the file. The watchdog thread is stopped. This method does nothing if the file is already unlocked.

setProperty

public void setProperty(String key,
                        String value)

Add or change a setting to the properties. This call does not save the file.

参数:

key - the key

value - the value

save

public Properties save()

Save the lock file.

返回:

the saved properties

load

public Properties load()

Load the properties file.

返回:

the properties

getFileLockMethod

public static FileLockMethod getFileLockMethod(String method)

Get the file locking method type given a method name.

参数:

method - the method name

返回:

the method type

抛出:

DbException - if the method name is unknown

getUniqueId

public String getUniqueId()

run

public void run()

指定者:

run 在接口中 Runnable