ai.h2o.mojos.runtime.readers

Class MojoReaderBackend

java.lang.Object

ai.h2o.mojos.runtime.readers.MojoReaderBackend

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

Direct Known Subclasses:

FolderMojoReaderBackend, InMemoryMojoReaderBackend, MojofileMojoReaderBackend

public abstract class MojoReaderBackend
extends java.lang.Object
implements java.io.Closeable

Interface representing a class capable of reading mojos. Usually the class implementing this interface will have a constructor taking an “address” of the mojo file that should be read. The class would then have to implement the logic for reading the referred mojo from the source.

For example, a hypothetical MysqlMojoReaderBackend may have a constructor taking the URL of the server, connection credentials, and a SQL query for retrieving the mojo record. The class would then implement the logic for connecting to the database and fetching the mojo (whole or in parts). It would also throw an IOException if anything fails.

The actual interface that the class needs to implement is for reading either text or binary fragments from within the mojo. This is because a .mojo file is actually a zip archive, and hence it contains several “files” inside. The user may decide to repackage the mojo contents into a different container: a plain directory for easier access, a .7z file for better compression, an encrypted Zip file for better security, etc. If the reader doesn’t wish to re-package the mojo contents and only retrieve it from non-filesystem source, then it may create a temporary .mojo file and pass it to the MojofileMojoReaderBackend reader.

Constructor Summary

Constructors

Constructor and Description
MojoReaderBackend()
MojoReaderBackend(java.lang.String baseDir)
MojoReaderBackend(java.lang.String baseDir, java.lang.String separator)
MojoReaderBackend(java.lang.String baseDir, java.lang.String separator, java.lang.String pipelineFileName)

Method Summary

Modifier and Type	Method and Description
abstract boolean	exists(java.lang.String filename)
java.lang.String	getBaseDir()
abstract byte[]	getBinaryFile(java.lang.String filename) Retrieve binary content inside the mojo, as a byte[] array.
abstract java.io.InputStream	getFile(java.lang.String filename) Retrieve content inside the mojo, as a InputStream.
java.io.BufferedReader	getPipelineFile() Deprecated.
java.lang.String	getPipelineFileName()
java.lang.String	getSeparator()
abstract java.io.BufferedReader	getTextFile(java.lang.String filename) Retrieve text content inside the mojo, as a BufferedReader.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.io.Closeable

close

Constructor Detail

MojoReaderBackend

public MojoReaderBackend()

MojoReaderBackend

public MojoReaderBackend(java.lang.String baseDir)

MojoReaderBackend

public MojoReaderBackend(java.lang.String baseDir,
                         java.lang.String separator)

MojoReaderBackend

public MojoReaderBackend(java.lang.String baseDir,
                         java.lang.String separator,
                         java.lang.String pipelineFileName)

Method Detail

getFile

public abstract java.io.InputStream getFile(java.lang.String filename)
                                     throws java.io.IOException

Retrieve content inside the mojo, as a InputStream.

Throws:

java.io.IOException

getTextFile

public abstract java.io.BufferedReader getTextFile(java.lang.String filename)
                                            throws java.io.IOException

Retrieve text content inside the mojo, as a BufferedReader.

Throws:

java.io.IOException

getBinaryFile

public abstract byte[] getBinaryFile(java.lang.String filename)
                              throws java.io.IOException

Retrieve binary content inside the mojo, as a byte[] array.

Throws:

java.io.IOException

exists

public abstract boolean exists(java.lang.String filename)

getPipelineFile

@Deprecated
public java.io.BufferedReader getPipelineFile()
                                                   throws java.io.IOException

Deprecated.

Throws:

java.io.IOException

getPipelineFileName

public java.lang.String getPipelineFileName()

getBaseDir

public java.lang.String getBaseDir()

getSeparator

public java.lang.String getSeparator()