org.neo4j.com
Class MasterUtil

java.lang.Object
  org.neo4j.com.MasterUtil

public class MasterUtil
extends Object

Nested Class Summary

static interface

MasterUtil.TxHandler

Field Summary

static Predicate<Long>	ALL
static MasterUtil.TxHandler	NO_ACTION

Constructor Summary

MasterUtil()

Method Summary

static <T> void	applyReceivedTransactions(Response<T> response, GraphDatabaseService graphDb, MasterUtil.TxHandler txHandler)
static Response<Void>	getTransactions(GraphDatabaseService graphDb, String dataSourceName, long startTx, long endTx) Given a data source name, a start and an end tx, this method extracts these transactions (inclusive) in a transaction stream and encapsulates them in a Response object, ready to be returned to the slave.
static <T> Response<T>	packResponse(GraphDatabaseService graphDb, SlaveContext context, T response, Predicate<Long> filter) After having created the response for a slave, this method compares its context against the local (master's) context and creates a transaction stream containing all the transactions the slave does not currently have.
static <T> Response<T>	packResponseWithoutTransactionStream(GraphDatabaseService graphDb, SlaveContext context, T response)
static SlaveContext.Tx[]	rotateLogs(GraphDatabaseService graphDb)
static SlaveContext	rotateLogsAndStreamStoreFiles(GraphDatabaseService graphDb, boolean includeLogicalLogs, StoreWriter writer)
static MasterUtil.TxHandler	txHandlerForFullCopy()

Methods inherited from class java.lang.Object

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

Field Detail

ALL

public static final Predicate<Long> ALL

NO_ACTION

public static final MasterUtil.TxHandler NO_ACTION

Constructor Detail

MasterUtil

public MasterUtil()

Method Detail

rotateLogs

public static SlaveContext.Tx[] rotateLogs(GraphDatabaseService graphDb)

rotateLogsAndStreamStoreFiles

public static SlaveContext rotateLogsAndStreamStoreFiles(GraphDatabaseService graphDb,
                                                         boolean includeLogicalLogs,
                                                         StoreWriter writer)

packResponse

public static <T> Response<T> packResponse(GraphDatabaseService graphDb,
                                           SlaveContext context,
                                           T response,
                                           Predicate<Long> filter)

After having created the response for a slave, this method compares its context against the local (master's) context and creates a transaction stream containing all the transactions the slave does not currently have. This way every response returned acts as an update for the slave.

Type Parameters:

T - The type of the response

Parameters:

graphDb - The graph database to use

context - The slave context

response - The response being packed

filter - A Predicate to apply on each txid, selecting only those that evaluate to true

Returns:

The response, packed with the latest transactions

getTransactions

public static Response<Void> getTransactions(GraphDatabaseService graphDb,
                                             String dataSourceName,
                                             long startTx,
                                             long endTx)

Given a data source name, a start and an end tx, this method extracts these transactions (inclusive) in a transaction stream and encapsulates them in a Response object, ready to be returned to the slave.

Parameters:

graphDb - The graph database to use

dataSourceName - The name of the data source to extract transactions from

startTx - The first tx in the returned stream

endTx - The last tx in the returned stream

Returns:

A Response object containing a transaction stream with the requested transactions from the specified data source.

packResponseWithoutTransactionStream

public static <T> Response<T> packResponseWithoutTransactionStream(GraphDatabaseService graphDb,
                                                                   SlaveContext context,
                                                                   T response)

applyReceivedTransactions

public static <T> void applyReceivedTransactions(Response<T> response,
                                                 GraphDatabaseService graphDb,
                                                 MasterUtil.TxHandler txHandler)
                                      throws IOException

Throws:

IOException

txHandlerForFullCopy

public static MasterUtil.TxHandler txHandlerForFullCopy()