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The MongoDB Java Driver uber-artifact, containing mongodb-driver, mongodb-driver-core, and bson
/*
* 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.operation;
import com.mongodb.MongoNamespace;
import com.mongodb.async.AsyncAggregateResponseBatchCursor;
import com.mongodb.async.AsyncBatchCursor;
import com.mongodb.async.SingleResultCallback;
import com.mongodb.binding.AsyncConnectionSource;
import com.mongodb.binding.AsyncReadBinding;
import com.mongodb.binding.ConnectionSource;
import com.mongodb.binding.ReadBinding;
import com.mongodb.client.model.Collation;
import com.mongodb.client.model.changestream.ChangeStreamLevel;
import com.mongodb.client.model.changestream.FullDocument;
import com.mongodb.connection.ConnectionDescription;
import com.mongodb.operation.OperationHelper.AsyncCallableWithSource;
import com.mongodb.operation.OperationHelper.CallableWithSource;
import com.mongodb.session.SessionContext;
import org.bson.BsonArray;
import org.bson.BsonBoolean;
import org.bson.BsonDocument;
import org.bson.BsonInt32;
import org.bson.BsonString;
import org.bson.BsonTimestamp;
import org.bson.BsonValue;
import org.bson.RawBsonDocument;
import org.bson.codecs.Decoder;
import org.bson.codecs.RawBsonDocumentCodec;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.operation.OperationHelper.withConnection;
import static com.mongodb.operation.OperationHelper.withConnectionSource;
/**
* An operation that executes an {@code $changeStream} aggregation.
*
* @param the operations result type.
* @mongodb.driver.manual aggregation/ Aggregation
* @mongodb.server.release 2.6
* @since 3.6
*/
@Deprecated
public class ChangeStreamOperation implements AsyncReadOperation>, ReadOperation> {
private static final RawBsonDocumentCodec RAW_BSON_DOCUMENT_CODEC = new RawBsonDocumentCodec();
private final AggregateOperationImpl wrapped;
private final FullDocument fullDocument;
private final Decoder decoder;
private final ChangeStreamLevel changeStreamLevel;
private BsonDocument resumeAfter;
private BsonDocument startAfter;
private BsonTimestamp startAtOperationTime;
/**
* Construct a new instance.
*
* @param namespace the database and collection namespace for the operation.
* @param fullDocument the fullDocument value
* @param pipeline the aggregation pipeline.
* @param decoder the decoder for the result documents.
*/
public ChangeStreamOperation(final MongoNamespace namespace, final FullDocument fullDocument, final List pipeline,
final Decoder decoder) {
this(namespace, fullDocument, pipeline, decoder, ChangeStreamLevel.COLLECTION);
}
/**
* Construct a new instance.
*
* @param namespace the database and collection namespace for the operation.
* @param fullDocument the fullDocument value
* @param pipeline the aggregation pipeline.
* @param decoder the decoder for the result documents.
* @param changeStreamLevel the level at which the change stream is observing
*
* @since 3.8
*/
public ChangeStreamOperation(final MongoNamespace namespace, final FullDocument fullDocument, final List pipeline,
final Decoder decoder, final ChangeStreamLevel changeStreamLevel) {
this.wrapped = new AggregateOperationImpl(namespace, pipeline, RAW_BSON_DOCUMENT_CODEC,
getAggregateTarget(), getPipelineCreator());
this.fullDocument = notNull("fullDocument", fullDocument);
this.decoder = notNull("decoder", decoder);
this.changeStreamLevel = notNull("changeStreamLevel", changeStreamLevel);
}
/**
* @return the namespace for this operation
*/
public MongoNamespace getNamespace() {
return wrapped.getNamespace();
}
/**
* @return the decoder for this operation
*/
public Decoder getDecoder() {
return decoder;
}
/**
* Returns the fullDocument value, in 3.6
*
* @return the fullDocument value
*/
public FullDocument getFullDocument() {
return fullDocument;
}
/**
* Returns the logical starting point for the new change stream.
*
* A null value represents the server default.
*
* @return the resumeAfter
* @deprecated use {@link #getResumeAfter()} instead
*/
@Deprecated
public BsonDocument getResumeToken() {
return resumeAfter;
}
/**
* Returns the logical starting point for the new change stream.
*
* A null value represents the server default.
*
* @return the resumeAfter resumeToken
* @since 3.11
* @mongodb.server.release 4.2
*/
public BsonDocument getResumeAfter() {
return resumeAfter;
}
/**
* Sets the logical starting point for the new change stream.
*
* @param resumeAfter the resumeToken
* @return this
*/
public ChangeStreamOperation resumeAfter(final BsonDocument resumeAfter) {
this.resumeAfter = resumeAfter;
return this;
}
/**
* Returns the logical starting point for the new change stream returning the first notification after the token.
*
* A null value represents the server default.
*
* @return the startAfter resumeToken
* @since 3.11
* @mongodb.server.release 4.2
*/
public BsonDocument getStartAfter() {
return startAfter;
}
/**
* Similar to {@code resumeAfter}, this option takes a resume token and starts a
* new change stream returning the first notification after the token.
*
* This will allow users to watch collections that have been dropped and recreated
* or newly renamed collections without missing any notifications.
*
* Note: The server will report an error if both {@code startAfter} and {@code resumeAfter} are specified.
*
* @param startAfter the startAfter resumeToken
* @return this
* @since 3.11
* @mongodb.server.release 4.2
* @mongodb.driver.manual changeStreams/#change-stream-start-after
*/
public ChangeStreamOperation startAfter(final BsonDocument startAfter) {
this.startAfter = startAfter;
return this;
}
/**
* Gets the aggregation pipeline.
*
* @return the pipeline
* @mongodb.driver.manual core/aggregation-introduction/#aggregation-pipelines Aggregation Pipeline
*/
public List getPipeline() {
return wrapped.getPipeline();
}
/**
* Gets the number of documents to return per batch. Default to 0, which indicates that the server chooses an appropriate batch size.
*
* @return the batch size, which may be null
* @mongodb.driver.manual reference/method/cursor.batchSize/#cursor.batchSize Batch Size
*/
public Integer getBatchSize() {
return wrapped.getBatchSize();
}
/**
* Sets the number of documents to return per batch.
*
* @param batchSize the batch size
* @return this
* @mongodb.driver.manual reference/method/cursor.batchSize/#cursor.batchSize Batch Size
*/
public ChangeStreamOperation batchSize(final Integer batchSize) {
wrapped.batchSize(batchSize);
return this;
}
/**
* The maximum amount of time for the server to wait on new documents to satisfy a tailable cursor
* query. This only applies to a TAILABLE_AWAIT cursor. When the cursor is not a TAILABLE_AWAIT cursor,
* this option is ignored.
*
* A zero value will be ignored.
*
* @param timeUnit the time unit to return the result in
* @return the maximum await execution time in the given time unit
* @mongodb.driver.manual reference/method/cursor.maxTimeMS/#cursor.maxTimeMS Max Time
*/
public long getMaxAwaitTime(final TimeUnit timeUnit) {
return wrapped.getMaxAwaitTime(timeUnit);
}
/**
* Sets the maximum await execution time on the server for this operation.
*
* @param maxAwaitTime the max await time. A value less than one will be ignored, and indicates that the driver should respect the
* server's default value
* @param timeUnit the time unit, which may not be null
* @return this
*/
public ChangeStreamOperation maxAwaitTime(final long maxAwaitTime, final TimeUnit timeUnit) {
wrapped.maxAwaitTime(maxAwaitTime, timeUnit);
return this;
}
/**
* Returns the collation options
*
* @return the collation options
* @mongodb.driver.manual reference/command/aggregate/ Aggregation
*/
public Collation getCollation() {
return wrapped.getCollation();
}
/**
* Sets the collation options
*
* A null value represents the server default.
*
* @param collation the collation options to use
* @return this
* @mongodb.driver.manual reference/command/aggregate/ Aggregation
*/
public ChangeStreamOperation collation(final Collation collation) {
wrapped.collation(collation);
return this;
}
/**
* The change stream will only provides changes that occurred after the specified timestamp.
*
* Any command run against the server will return an operation time that can be used here.
* The default value is an operation time obtained from the server before the change stream was created.
*
* @param startAtOperationTime the start at operation time
* @return this
* @since 3.8
* @mongodb.server.release 4.0
* @mongodb.driver.manual reference/method/db.runCommand/
*/
public ChangeStreamOperation startAtOperationTime(final BsonTimestamp startAtOperationTime) {
this.startAtOperationTime = startAtOperationTime;
return this;
}
/**
* Returns the start at operation time
*
* @return the start at operation time
* @since 3.8
* @mongodb.server.release 4.0
*/
public BsonTimestamp getStartAtOperationTime() {
return startAtOperationTime;
}
/**
* Enables retryable reads if a read fails due to a network error.
*
* @param retryReads true if reads should be retried
* @return this
* @mongodb.driver.manual reference/method/db.collection.find/ Filter
* @since 3.11
*/
public ChangeStreamOperation retryReads(final boolean retryReads) {
wrapped.retryReads(retryReads);
return this;
}
/**
* Gets the value for retryable reads. The default is true.
*
* @return the retryable reads value
* @since 3.11
*/
public boolean getRetryReads() {
return wrapped.getRetryReads();
}
@Override
public BatchCursor execute(final ReadBinding binding) {
return withConnectionSource(binding, new CallableWithSource>() {
@Override
public BatchCursor call(final ConnectionSource source) {
AggregateResponseBatchCursor cursor =
(AggregateResponseBatchCursor) wrapped.execute(binding);
return new ChangeStreamBatchCursor(ChangeStreamOperation.this, cursor, binding,
setChangeStreamOptions(cursor.getPostBatchResumeToken(), cursor.getOperationTime(),
source.getServerDescription().getMaxWireVersion(), cursor.isFirstBatchEmpty()));
}
});
}
@Override
public void executeAsync(final AsyncReadBinding binding, final SingleResultCallback> callback) {
wrapped.executeAsync(binding, new SingleResultCallback>() {
@Override
public void onResult(final AsyncBatchCursor result, final Throwable t) {
if (t != null) {
callback.onResult(null, t);
} else {
final AsyncAggregateResponseBatchCursor cursor =
(AsyncAggregateResponseBatchCursor) result;
withConnection(binding, new AsyncCallableWithSource() {
@Override
public void call(final AsyncConnectionSource source, final Throwable t) {
if (t != null) {
callback.onResult(null, t);
} else {
callback.onResult(new AsyncChangeStreamBatchCursor(ChangeStreamOperation.this, cursor, binding,
setChangeStreamOptions(cursor.getPostBatchResumeToken(), cursor.getOperationTime(),
source.getServerDescription().getMaxWireVersion(), cursor.isFirstBatchEmpty())), null);
}
source.release();
}
});
}
}
});
}
private BsonDocument setChangeStreamOptions(final BsonDocument postBatchResumeToken, final BsonTimestamp operationTime,
final int maxWireVersion, final boolean firstBatchEmpty) {
BsonDocument resumeToken = null;
if (startAfter != null) {
resumeToken = startAfter;
} else if (resumeAfter != null) {
resumeToken = resumeAfter;
} else if (startAtOperationTime == null && postBatchResumeToken == null && firstBatchEmpty && maxWireVersion >= 7) {
startAtOperationTime = operationTime;
}
return resumeToken;
}
/**
* Set the change stream operation options for a resumeable operation.
*
* @param resumeToken the resume token cached prior to resume
* @param maxWireVersion the max wire version reported by the server description
* @since 3.11
*/
public void setChangeStreamOptionsForResume(final BsonDocument resumeToken, final int maxWireVersion) {
startAfter = null;
if (resumeToken != null) {
startAtOperationTime = null;
resumeAfter = resumeToken;
} else if (startAtOperationTime != null && maxWireVersion >= 7) {
resumeAfter = null;
} else {
resumeAfter = null;
startAtOperationTime = null;
}
}
private AggregateOperationImpl.AggregateTarget getAggregateTarget() {
return new AggregateOperationImpl.AggregateTarget() {
@Override
public BsonValue create() {
return changeStreamLevel == ChangeStreamLevel.COLLECTION
? new BsonString(getNamespace().getCollectionName()) : new BsonInt32(1);
}
};
}
private AggregateOperationImpl.PipelineCreator getPipelineCreator() {
return new AggregateOperationImpl.PipelineCreator() {
@Override
public BsonArray create(final ConnectionDescription description, final SessionContext sessionContext) {
List changeStreamPipeline = new ArrayList();
BsonDocument changeStream = new BsonDocument("fullDocument", new BsonString(fullDocument.getValue()));
if (changeStreamLevel == ChangeStreamLevel.CLIENT) {
changeStream.append("allChangesForCluster", BsonBoolean.TRUE);
}
if (resumeAfter != null) {
changeStream.append("resumeAfter", resumeAfter);
}
if (startAfter != null) {
changeStream.append("startAfter", startAfter);
}
if (startAtOperationTime != null) {
changeStream.append("startAtOperationTime", startAtOperationTime);
}
changeStreamPipeline.add(new BsonDocument("$changeStream", changeStream));
changeStreamPipeline.addAll(getPipeline());
return new BsonArray(changeStreamPipeline);
}
};
}
}
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