org.apache.tinkerpop.gremlin.driver

Class ResultSet

java.lang.Object

org.apache.tinkerpop.gremlin.driver.ResultSet

All Implemented Interfaces:

Iterable<Result>

public final class ResultSet
extends Object
implements Iterable<Result>

A ResultSet is returned from the submission of a Gremlin script to the server and represents the results provided by the server. The results from the server are streamed into the ResultSet and therefore may not be available immediately. As such, ResultSet provides access to a a number of functions that help to work with the asynchronous nature of the data streaming back. Data from results is stored in an Result which can be used to retrieve the item once it is on the client side.

Note that a ResultSet is a forward-only stream only so depending on how the methods are called and interacted with, it is possible to return partial bits of the total response (e.g. calling one() followed by all() will make it so that the List of results returned from all() have one Result missing from the total set as it was already retrieved by one().

This class is not thread-safe.

Author:

Stephen Mallette (http://stephen.genoprime.com)

Constructor Summary

Constructors

Constructor and Description
ResultSet(org.apache.tinkerpop.gremlin.driver.ResultQueue resultQueue, ExecutorService executor, CompletableFuture<Void> readCompleted)

Method Summary

Modifier and Type	Method and Description
CompletableFuture<List<Result>>	all() The returned CompletableFuture completes when all reads are complete for this request and the entire result has been accounted for on the client.
boolean	allItemsAvailable() Determines if all items have been returned to the client.
int	getAvailableItemCount() Gets the number of items available on the client.
Iterator<Result>	iterator() Returns a blocking iterator of the items streaming from the server to the client.
Result	one() Get the next Result from the stream, blocking until one is available.
CompletableFuture<List<Result>>	some(int items) The returned CompletableFuture completes when the number of items specified are available.
Stream<Result>	stream() Stream items with a blocking iterator.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

ResultSet

public ResultSet(org.apache.tinkerpop.gremlin.driver.ResultQueue resultQueue,
                 ExecutorService executor,
                 CompletableFuture<Void> readCompleted)

Method Detail

allItemsAvailable

public boolean allItemsAvailable()

Determines if all items have been returned to the client.

getAvailableItemCount

public int getAvailableItemCount()

Gets the number of items available on the client.

one

public Result one()

Get the next Result from the stream, blocking until one is available.

some

public CompletableFuture<List<Result>> some(int items)

The returned CompletableFuture completes when the number of items specified are available. The number returned will be equal to or less than that number. They will only be less if the stream is completed and there are less than that number specified available.

all

public CompletableFuture<List<Result>> all()

The returned CompletableFuture completes when all reads are complete for this request and the entire result has been accounted for on the client. While this method is named "all" it really refers to retrieving all remaining items in the set. For large result sets it is preferred to use Iterator or Stream options, as the results will be held in memory at once.

stream

public Stream<Result> stream()

Stream items with a blocking iterator.

iterator

public Iterator<Result> iterator()

Returns a blocking iterator of the items streaming from the server to the client. This Iterator will consume results as they arrive and leaving the ResultSet empty when complete.

The returned Iterator does not support the Iterator.remove() method.

Specified by:

iterator in interface Iterable<Result>