Package org.apache.hugegraph.computer.core.store

Class FileManager

java.lang.Object

org.apache.hugegraph.computer.core.store.FileManager

All Implemented Interfaces:

Manager, FileGenerator

public class FileManager
extends java.lang.Object
implements FileGenerator, Manager

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	NAME

Constructor Summary

Constructors

Constructor	Description
FileManager()

Method Summary

Modifier and Type	Method	Description
void	close(org.apache.hugegraph.computer.core.config.Config config)	Close the resources used in the computation.
java.util.List<java.lang.String>	dirs()
void	init(org.apache.hugegraph.computer.core.config.Config config)	Used to add the resources needed by the computation.
java.lang.String	name()	The unique identify name.
java.lang.String	nextDirectory()	Allocate a base directory each call.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hugegraph.computer.core.store.FileGenerator

nextDirectory, randomDirectory

Methods inherited from interface org.apache.hugegraph.computer.core.manager.Manager

afterSuperstep, beforeSuperstep, inited

Field Detail

NAME

public static final java.lang.String NAME

See Also:

Constant Field Values

Constructor Detail

FileManager

public FileManager()

Method Detail

name

public java.lang.String name()

Description copied from interface: Manager

The unique identify name.

Specified by:

name in interface Manager

init

public void init(org.apache.hugegraph.computer.core.config.Config config)

Description copied from interface: Manager

Used to add the resources needed by the computation. Be called only one time before all supersteps start.

Specified by:

init in interface Manager

close

public void close(org.apache.hugegraph.computer.core.config.Config config)

Description copied from interface: Manager

Close the resources used in the computation. Be called only one time after all supersteps ended.

Specified by:

close in interface Manager

nextDirectory

public java.lang.String nextDirectory()

Description copied from interface: FileGenerator

Allocate a base directory each call. There may be multi base directories configured by user, generally each base directory represent a disk, allocated by round mode. For example, the base directories configured ["/disk1/job_001/container_001", "/disk2/job_001/container_001"]. It indicates there are two base directories and each base directory for one disk. First call returns "/disk1/job_001/container_001", second call returns "/disk2/job_001/container_001" and third call returns "/disk1/job_001/container_001" and so on in round mode. Note: Can't request a directory and write many files into it, this will cause the io pressure can't distributed over several disks.

Specified by:

nextDirectory in interface FileGenerator

Returns:

The directory of allocated local base directory.

dirs

public java.util.List<java.lang.String> dirs()

Specified by:

dirs in interface FileGenerator