com.hazelcast.spi.hotrestart.impl.io

Class HardLinkCopyStrategy

java.lang.Object

com.hazelcast.spi.hotrestart.impl.io.HardLinkCopyStrategy

All Implemented Interfaces:

FileCopyStrategy

public class HardLinkCopyStrategy
extends Object
implements FileCopyStrategy

File copy strategy which uses hard links from JDK7 (see https://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html#createLink(java.nio.file.Path,%20java.nio.file.Path)). The availability of hard links and usefulness of this strategy depends on whether you are running on JDK7 or higher and if the requirements by the createLink method are satisfied. If the source file changes after the copy operation has finished, the contents of the target file will change as well but if the source file is deleted or renamed, the target file will remain unchanged and still existant. Thus this strategy is most useful for files that never change and are copy-on-write. The constructor of this strategy will throw an UnsupportedOperationException if the relevant classes or methods were not found.

Constructor Summary

Constructors

Constructor and Description
HardLinkCopyStrategy() Constructs the strategy or throws an exception if the relevant classes or methods are not available : java.nio.file.Files#createLink(java.nio.file.Path, java.nio.file.Path) java.io.File#toPath()

Method Summary

Modifier and Type	Method and Description
void	copy(File source, File target) Copy the file from source to target.

Methods inherited from class java.lang.Object

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

Constructor Detail

HardLinkCopyStrategy

public HardLinkCopyStrategy()

Constructs the strategy or throws an exception if the relevant classes or methods are not available :

• java.nio.file.Files#createLink(java.nio.file.Path, java.nio.file.Path)
• java.io.File#toPath()

Throws:

UnsupportedOperationException - if the relevant classes or methods were not found

Method Detail

copy

public void copy(File source,
                 File target)

Description copied from interface: FileCopyStrategy

Copy the file from source to target. The implementation can choose the exact way this happens and the target does not necessarily need to contain a copy of the data. Check the implementation for details.

Specified by:

copy in interface FileCopyStrategy