com.mongodb.operation

类 ParallelCollectionScanOperation<T>

java.lang.Object

com.mongodb.operation.ParallelCollectionScanOperation<T>

类型参数:

T - the operations result type.

所有已实现的接口:

AsyncReadOperation<java.util.List<AsyncBatchCursor<T>>>, ReadOperation<java.util.List<BatchCursor<T>>>

public class ParallelCollectionScanOperation<T>
extends java.lang.Object
implements AsyncReadOperation<java.util.List<AsyncBatchCursor<T>>>, ReadOperation<java.util.List<BatchCursor<T>>>

Return a list of cursors over the collection that can be used to scan it in parallel.

Note: As of MongoDB 2.6, this operation will work against a mongod, but not a mongos.

从以下版本开始:

3.0

MongoDB documentation

parallelCollectionScan

Since server release

2.6

构造器概要

构造器

构造器和说明
ParallelCollectionScanOperation(MongoNamespace namespace, int numCursors, Decoder<T> decoder) Construct a new instance.

方法概要

限定符和类型	方法和说明
ParallelCollectionScanOperation<T>	batchSize(int batchSize) The batch size to use for each cursor.
java.util.List<BatchCursor<T>>	execute(ReadBinding binding) General execute which can return anything of type T
void	executeAsync(AsyncReadBinding binding, SingleResultCallback<java.util.List<AsyncBatchCursor<T>>> callback) General execute which can return anything of type T
int	getBatchSize() Gets the batch size to use for each cursor.
int	getNumCursors() Gets the number of cursors requested.
ReadConcern	getReadConcern() Gets the read concern
ParallelCollectionScanOperation<T>	readConcern(ReadConcern readConcern) Sets the read concern

从类继承的方法 java.lang.Object

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

构造器详细资料

ParallelCollectionScanOperation

public ParallelCollectionScanOperation(MongoNamespace namespace,
                                       int numCursors,
                                       Decoder<T> decoder)

Construct a new instance.

参数:

namespace - the database and collection namespace for the operation.

numCursors - The maximum number of cursors to return. Must be between 1 and 10000, inclusive.

decoder - the decoder for the result documents.

方法详细资料

getNumCursors

public int getNumCursors()

Gets the number of cursors requested.

返回:

number of cursors requested.

getBatchSize

public int getBatchSize()

Gets the batch size to use for each cursor. The default value is 0, which tells the server to use its own default batch size.

返回:

batch size

MongoDB documentation

BatchSize

batchSize

public ParallelCollectionScanOperation<T> batchSize(int batchSize)

The batch size to use for each cursor.

参数:

batchSize - the batch size, which must be greater than or equal to 0

返回:

this

MongoDB documentation

BatchSize

getReadConcern

public ReadConcern getReadConcern()

Gets the read concern

返回:

the read concern

从以下版本开始:

3.2

MongoDB documentation

Read Concern

readConcern

public ParallelCollectionScanOperation<T> readConcern(ReadConcern readConcern)

Sets the read concern

参数:

readConcern - the read concern

返回:

this

从以下版本开始:

3.2

MongoDB documentation

Read Concern

execute

public java.util.List<BatchCursor<T>> execute(ReadBinding binding)

从接口复制的说明: ReadOperation

General execute which can return anything of type T

指定者:

execute 在接口中 ReadOperation<java.util.List<BatchCursor<T>>>

参数:

binding - the binding to execute in the context of

返回:

T, the result of the execution

executeAsync

public void executeAsync(AsyncReadBinding binding,
                         SingleResultCallback<java.util.List<AsyncBatchCursor<T>>> callback)

从接口复制的说明: AsyncReadOperation

General execute which can return anything of type T

指定者:

executeAsync 在接口中 AsyncReadOperation<java.util.List<AsyncBatchCursor<T>>>

参数:

binding - the binding to execute in the context of

callback - the callback to be called when the operation has been executed