com.thinkaurelius.titan.diskstorage.common

Class DistributedStoreManager

java.lang.Object

com.thinkaurelius.titan.diskstorage.common.AbstractStoreManager

com.thinkaurelius.titan.diskstorage.common.DistributedStoreManager

All Implemented Interfaces:

StoreManager

public abstract class DistributedStoreManager
extends AbstractStoreManager

Abstract class that handles configuration options shared by all distributed storage backends

Author:

Matthias Broecheler (me@matthiasb.com)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DistributedStoreManager.Deployment
class	DistributedStoreManager.MaskedTimestamp Helper class to create the deletion and addition timestamps for a particular transaction.

Field Summary

Fields

Modifier and Type	Field and Description
protected int	connectionPoolSize
protected Duration	connectionTimeoutMS
protected String[]	hostnames
protected int	pageSize
protected String	password
protected int	port
protected TimestampProvider	times
protected String	username

Fields inherited from class com.thinkaurelius.titan.diskstorage.common.AbstractStoreManager

batchLoading, isReadOnly, storageConfig, transactional

Constructor Summary

Constructors

Constructor and Description
DistributedStoreManager(Configuration storageConfig, int portDefault)

Method Summary

Methods

Modifier and Type	Method and Description
abstract DistributedStoreManager.Deployment	getDeployment() Returns the DistributedStoreManager.Deployment mode of this connection to the storage backend
int	getPageSize() Returns the default configured page size for this storage backend.
protected String	getSingleHostname() Returns a randomly chosen host name.
TimestampProvider	getTimestampProvider()
boolean	hasAuthentication() Whether authentication is enabled for this storage backend
protected void	sleepAfterWrite(StoreTransaction txh, DistributedStoreManager.MaskedTimestamp mustPass) This method attempts to generate Rid in the following three ways, in order, returning the value produced by the first successful attempt in the sequence.
String	toString()

Methods inherited from class com.thinkaurelius.titan.diskstorage.common.AbstractStoreManager

getMetaDataSchema, getStorageConfig

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.thinkaurelius.titan.diskstorage.keycolumnvalue.StoreManager

beginTransaction, clearStorage, close, getFeatures, getLocalKeyPartition, getName

Field Detail

hostnames

protected final String[] hostnames

port

protected final int port

connectionTimeoutMS

protected final Duration connectionTimeoutMS

connectionPoolSize

protected final int connectionPoolSize

pageSize

protected final int pageSize

username

protected final String username

password

protected final String password

times

protected final TimestampProvider times

Constructor Detail

DistributedStoreManager

public DistributedStoreManager(Configuration storageConfig,
                       int portDefault)

Method Detail

getSingleHostname

protected String getSingleHostname()

Returns a randomly chosen host name. This is used to pick one host when multiple are configured

Returns:

hasAuthentication

public boolean hasAuthentication()

Whether authentication is enabled for this storage backend

Returns:

getPageSize

public int getPageSize()

Returns the default configured page size for this storage backend. The page size is used to determine the number of records to request at a time when streaming result data.

Returns:

getTimestampProvider

public TimestampProvider getTimestampProvider()

getDeployment

public abstract DistributedStoreManager.Deployment getDeployment()

Returns the DistributedStoreManager.Deployment mode of this connection to the storage backend

Returns:

toString

public String toString()

Overrides:

toString in class Object

sleepAfterWrite

protected void sleepAfterWrite(StoreTransaction txh,
                   DistributedStoreManager.MaskedTimestamp mustPass)
                        throws StorageException

This method attempts to generate Rid in the following three ways, in order, returning the value produced by the first successful attempt in the sequence.

1. If config contains GraphDatabaseConfiguration#INSTANCE_RID_RAW_KEY, then read it as a String value. Convert the String returned into a char[] and call org.apache.commons.codec.binary.Hex#decodeHex on the char[]. The byte[] returned by decodeHex is then returned as Rid.
2. If config contains GraphDatabaseConfiguration#INSTANCE_RID_SHORT_KEY, then read it as a short value. Call InetAddress.getLocalHost(), and on its return value call InetAddress.getAddress() to retrieve the machine's IP address in byte[] form. The returned Rid is a byte[] containing the localhost address bytes in its lower indices and the short value in its penultimate and final indices.
3. If both of the previous failed, then call RuntimeMXBean.getName() and then call String#getBytes() on the returned value. Return a Rid as described in the previous point, replacing the short value with the byte[] representing the JVM name.

Parameters:

config - commons config from which to read Rid-related keys

Throws:

StorageException