com.graphaware.writer.neo4j

Class BatchWriter

java.lang.Object

com.google.common.util.concurrent.AbstractScheduledService

com.graphaware.writer.service.QueueBackedScheduledService<RunnableFuture<?>>

com.graphaware.writer.neo4j.SingleThreadedWriter

com.graphaware.writer.neo4j.BatchWriter

All Implemented Interfaces:

com.google.common.util.concurrent.Service, Neo4jWriter, Writer

public class BatchWriter
extends SingleThreadedWriter
implements Neo4jWriter

SingleThreadedWriter that writes tasks in batches. This is more performant but dangerous, since a single task's failure can roll back the whole batch. This is here for experiments, not for production.

Nested Class Summary

Nested classes/interfaces inherited from class com.google.common.util.concurrent.AbstractScheduledService

com.google.common.util.concurrent.AbstractScheduledService.CustomScheduler, com.google.common.util.concurrent.AbstractScheduledService.Scheduler

Nested classes/interfaces inherited from interface com.google.common.util.concurrent.Service

com.google.common.util.concurrent.Service.Listener, com.google.common.util.concurrent.Service.State

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_BATCH_SIZE

Fields inherited from class com.graphaware.writer.neo4j.SingleThreadedWriter

database

Fields inherited from class com.graphaware.writer.service.QueueBackedScheduledService

DEFAULT_QUEUE_CAPACITY, queue

Constructor Summary

Constructors

Constructor and Description
BatchWriter(org.neo4j.graphdb.GraphDatabaseService database) Construct a new writer with a default queue capacity of 10,000 and a batch size of 1,000.
BatchWriter(org.neo4j.graphdb.GraphDatabaseService database, int queueCapacity, int batchSize) Construct a new writer.

Method Summary

Modifier and Type	Method and Description
protected <T> RunnableFuture<T>	createTask(Callable<T> task) Create a runnable future from the given task.
protected void	processInput(RunnableFuture<?> input) Perform the processing of the given RunnableFuture.
protected void	runOneIteration()

Methods inherited from class com.graphaware.writer.neo4j.SingleThreadedWriter

block, offer, start, stop, write, write, write

Methods inherited from class com.graphaware.writer.service.QueueBackedScheduledService

equals, hashCode, logEmptyQueue, loggingFrequencyMs, offer, scheduler, shutDown

Methods inherited from class com.google.common.util.concurrent.AbstractScheduledService

addListener, awaitRunning, awaitRunning, awaitTerminated, awaitTerminated, executor, failureCause, isRunning, serviceName, startAsync, startUp, state, stopAsync, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.graphaware.writer.neo4j.Neo4jWriter

write, write, write

Methods inherited from interface com.graphaware.writer.Writer

start, stop

Field Detail

DEFAULT_BATCH_SIZE

public static final int DEFAULT_BATCH_SIZE

See Also:

Constant Field Values

Constructor Detail

BatchWriter

public BatchWriter(org.neo4j.graphdb.GraphDatabaseService database)

Construct a new writer with a default queue capacity of 10,000 and a batch size of 1,000.

Parameters:

database - to write to.

BatchWriter

public BatchWriter(org.neo4j.graphdb.GraphDatabaseService database,
                   int queueCapacity,
                   int batchSize)

Construct a new writer.

Parameters:

database - to write to.

queueCapacity - capacity of the queue.

batchSize - batch size.

Method Detail

createTask

protected <T> RunnableFuture<T> createTask(Callable<T> task)

Create a runnable future from the given task.

Specified by:

createTask in class SingleThreadedWriter

Parameters:

task - task.

Returns:

future.

runOneIteration

protected final void runOneIteration()
                              throws Exception

Specified by:

runOneIteration in class com.google.common.util.concurrent.AbstractScheduledService

Throws:

Exception

processInput

protected void processInput(RunnableFuture<?> input)

Perform the processing of the given RunnableFuture. Can be overridden to add extra logging, timing, etc.

Parameters:

input - to process.