/
AggregatePublisherImpl.java
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/
AggregatePublisherImpl.java
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/*
* Copyright 2008-present MongoDB, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.mongodb.reactivestreams.client.internal;
import com.mongodb.ExplainVerbosity;
import com.mongodb.MongoNamespace;
import com.mongodb.client.model.Collation;
import com.mongodb.internal.async.AsyncBatchCursor;
import com.mongodb.internal.client.model.AggregationLevel;
import com.mongodb.internal.client.model.FindOptions;
import com.mongodb.internal.operation.AggregateOperation;
import com.mongodb.internal.operation.AsyncReadOperation;
import com.mongodb.internal.operation.AsyncWriteOperation;
import com.mongodb.lang.Nullable;
import com.mongodb.reactivestreams.client.AggregatePublisher;
import com.mongodb.reactivestreams.client.ClientSession;
import org.bson.BsonDocument;
import org.bson.BsonString;
import org.bson.Document;
import org.bson.conversions.Bson;
import org.reactivestreams.Publisher;
import java.util.List;
import java.util.concurrent.TimeUnit;
import static com.mongodb.assertions.Assertions.notNull;
final class AggregatePublisherImpl<T> extends BatchCursorPublisher<T> implements AggregatePublisher<T> {
private final List<? extends Bson> pipeline;
private final AggregationLevel aggregationLevel;
private Boolean allowDiskUse;
private long maxTimeMS;
private long maxAwaitTimeMS;
private Boolean bypassDocumentValidation;
private Collation collation;
private String comment;
private Bson hint;
private Bson variables;
AggregatePublisherImpl(
@Nullable final ClientSession clientSession,
final MongoOperationPublisher<T> mongoOperationPublisher,
final List<? extends Bson> pipeline,
final AggregationLevel aggregationLevel) {
super(clientSession, mongoOperationPublisher);
this.pipeline = notNull("pipeline", pipeline);
this.aggregationLevel = notNull("aggregationLevel", aggregationLevel);
}
@Override
public AggregatePublisher<T> allowDiskUse(@Nullable final Boolean allowDiskUse) {
this.allowDiskUse = allowDiskUse;
return this;
}
@Override
public AggregatePublisher<T> batchSize(final int batchSize) {
super.batchSize(batchSize);
return this;
}
@Override
public AggregatePublisher<T> maxTime(final long maxTime, final TimeUnit timeUnit) {
notNull("timeUnit", timeUnit);
this.maxTimeMS = TimeUnit.MILLISECONDS.convert(maxTime, timeUnit);
return this;
}
@Override
public AggregatePublisher<T> maxAwaitTime(final long maxAwaitTime, final TimeUnit timeUnit) {
notNull("timeUnit", timeUnit);
this.maxAwaitTimeMS = TimeUnit.MILLISECONDS.convert(maxAwaitTime, timeUnit);
return this;
}
@Override
public AggregatePublisher<T> bypassDocumentValidation(@Nullable final Boolean bypassDocumentValidation) {
this.bypassDocumentValidation = bypassDocumentValidation;
return this;
}
@Override
public AggregatePublisher<T> collation(@Nullable final Collation collation) {
this.collation = collation;
return this;
}
@Override
public AggregatePublisher<T> comment(@Nullable final String comment) {
this.comment = comment;
return this;
}
@Override
public AggregatePublisher<T> hint(@Nullable final Bson hint) {
this.hint = hint;
return this;
}
@Override
public AggregatePublisher<T> let(@Nullable final Bson variables) {
this.variables = variables;
return this;
}
@Override
public Publisher<Void> toCollection() {
BsonDocument lastPipelineStage = getLastPipelineStage();
if (lastPipelineStage == null || !lastPipelineStage.containsKey("$out") && !lastPipelineStage.containsKey("$merge")) {
throw new IllegalStateException("The last stage of the aggregation pipeline must be $out or $merge");
}
return getMongoOperationPublisher().createWriteOperationMono(this::getAggregateToCollectionOperation, getClientSession());
}
@Override
public Publisher<Document> explain() {
return publishExplain(Document.class, null);
}
@Override
public Publisher<Document> explain(final ExplainVerbosity verbosity) {
return publishExplain(Document.class, notNull("verbosity", verbosity));
}
@Override
public <E> Publisher<E> explain(final Class<E> explainResultClass) {
return publishExplain(explainResultClass, null);
}
@Override
public <E> Publisher<E> explain(final Class<E> explainResultClass, final ExplainVerbosity verbosity) {
return publishExplain(explainResultClass, notNull("verbosity", verbosity));
}
private <E> Publisher<E> publishExplain(final Class<E> explainResultClass, @Nullable final ExplainVerbosity verbosity) {
notNull("explainDocumentClass", explainResultClass);
return getMongoOperationPublisher().createReadOperationMono(() ->
asAggregateOperation(1).asAsyncExplainableOperation(verbosity,
getCodecRegistry().get(explainResultClass)),
getClientSession());
}
@Override
AsyncReadOperation<AsyncBatchCursor<T>> asAsyncReadOperation(final int initialBatchSize) {
MongoNamespace outNamespace = getOutNamespace();
if (outNamespace != null) {
AsyncWriteOperation<Void> aggregateToCollectionOperation = getAggregateToCollectionOperation();
FindOptions findOptions = new FindOptions().collation(collation).batchSize(initialBatchSize);
AsyncReadOperation<AsyncBatchCursor<T>> findOperation =
getOperations().find(outNamespace, new BsonDocument(), getDocumentClass(), findOptions);
return new WriteOperationThenCursorReadOperation<>(aggregateToCollectionOperation, findOperation);
} else {
return asAggregateOperation(initialBatchSize);
}
}
private AggregateOperation<T> asAggregateOperation(final int initialBatchSize) {
return getOperations()
.aggregate(pipeline, getDocumentClass(), maxTimeMS, maxAwaitTimeMS,
initialBatchSize, collation, hint, comment, variables, allowDiskUse, aggregationLevel);
}
private AsyncWriteOperation<Void> getAggregateToCollectionOperation() {
return getOperations().aggregateToCollection(pipeline, maxTimeMS, allowDiskUse, bypassDocumentValidation, collation, hint, comment,
variables, aggregationLevel);
}
@Nullable
private BsonDocument getLastPipelineStage() {
if (pipeline.isEmpty()) {
return null;
} else {
Bson lastStage = notNull("last pipeline stage", pipeline.get(pipeline.size() - 1));
return lastStage.toBsonDocument(getDocumentClass(), getCodecRegistry());
}
}
@Nullable
private MongoNamespace getOutNamespace() {
BsonDocument lastPipelineStage = getLastPipelineStage();
if (lastPipelineStage == null) {
return null;
}
String databaseName = getNamespace().getDatabaseName();
if (lastPipelineStage.containsKey("$out")) {
if (lastPipelineStage.get("$out").isString()) {
return new MongoNamespace(databaseName, lastPipelineStage.getString("$out").getValue());
} else if (lastPipelineStage.get("$out").isDocument()) {
BsonDocument outDocument = lastPipelineStage.getDocument("$out");
if (!outDocument.containsKey("db") || !outDocument.containsKey("coll")) {
throw new IllegalStateException("Cannot return a cursor when the value for $out stage is not a namespace document");
}
return new MongoNamespace(outDocument.getString("db").getValue(), outDocument.getString("coll").getValue());
} else {
throw new IllegalStateException("Cannot return a cursor when the value for $out stage "
+ "is not a string or namespace document");
}
} else if (lastPipelineStage.containsKey("$merge")) {
if (lastPipelineStage.isString("$merge")) {
return new MongoNamespace(databaseName, lastPipelineStage.getString("$merge").getValue());
} else if (lastPipelineStage.isDocument("$merge")) {
BsonDocument mergeDocument = lastPipelineStage.getDocument("$merge");
if (mergeDocument.isDocument("into")) {
BsonDocument intoDocument = mergeDocument.getDocument("into");
return new MongoNamespace(intoDocument.getString("db", new BsonString(databaseName)).getValue(),
intoDocument.getString("coll").getValue());
} else if (mergeDocument.isString("into")) {
return new MongoNamespace(databaseName, mergeDocument.getString("into").getValue());
}
} else {
throw new IllegalStateException("Cannot return a cursor when the value for $merge stage is not a string or a document");
}
}
return null;
}
}