Interface ReactiveMapReduceOperation

All Known Subinterfaces:

ReactiveFluentMongoOperations, ReactiveMongoOperations

All Known Implementing Classes:

ReactiveMongoTemplate

public interface ReactiveMapReduceOperation

ReactiveMapReduceOperation allows creation and execution of MongoDB mapReduce operations in a fluent API style. The starting domainType is used for mapping an optional Query provided via matching into the MongoDB specific representation. By default, the originating domainType is also used for mapping back the results from the Document. However, it is possible to define an different returnType via as to mapping the result.
The collection to operate on is by default derived from the initial domainType and can be defined there via Document. Using inCollection allows to override the collection name for the execution.

    
        mapReduce(Human.class)
            .map("function() { emit(this.id, this.firstname) }")
            .reduce("function(id, name) { return sum(id, name); }")
            .inCollection("star-wars")
            .as(Jedi.class)
            .matching(query(where("lastname").is("skywalker")))
            .all();
    

Since:

2.1

Author:

Christoph Strobl

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	ReactiveMapReduceOperation.MapReduceWithCollection<T>	Collection override (Optional).
static interface	ReactiveMapReduceOperation.MapReduceWithMapFunction<T>	Provide the Javascript function() used to map matching documents.
static interface	ReactiveMapReduceOperation.MapReduceWithOptions<T>	Additional mapReduce options (Optional).
static interface	ReactiveMapReduceOperation.MapReduceWithProjection<T>	Result type override (Optional).
static interface	ReactiveMapReduceOperation.MapReduceWithQuery<T>	Input document filter query (Optional).
static interface	ReactiveMapReduceOperation.MapReduceWithReduceFunction<T>	Provide the Javascript function() used to reduce matching documents.
static interface	ReactiveMapReduceOperation.ReactiveMapReduce<T>	ReactiveMapReduceOperation.ReactiveMapReduce provides methods for constructing reactive mapReduce operations in a fluent way.
static interface	ReactiveMapReduceOperation.TerminatingMapReduce<T>	Trigger mapReduce execution by calling one of the terminating methods.

Method Summary

Modifier and Type	Method	Description
<T> ReactiveMapReduceOperation.MapReduceWithMapFunction<T>	mapReduce(Class<T> domainType)	Start creating a mapReduce operation for the given domainType.

Method Details

mapReduce

<T>
ReactiveMapReduceOperation.MapReduceWithMapFunction<T> mapReduce(Class<T> domainType)

Start creating a mapReduce operation for the given domainType.

Parameters:

domainType - must not be null.

Returns:

new instance of ExecutableFindOperation.ExecutableFind.

Throws:

IllegalArgumentException - if domainType is null.