/*
* Copyright 2015-2016 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.async.client;
import com.mongodb.Block;
import com.mongodb.Function;
import com.mongodb.MongoNamespace;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.WriteConcern;
import com.mongodb.async.AsyncBatchCursor;
import com.mongodb.async.SingleResultCallback;
import com.mongodb.client.model.Collation;
import com.mongodb.client.model.FindOptions;
import com.mongodb.client.model.MapReduceAction;
import com.mongodb.operation.AsyncOperationExecutor;
import com.mongodb.operation.MapReduceStatistics;
import com.mongodb.operation.MapReduceToCollectionOperation;
import com.mongodb.operation.MapReduceWithInlineResultsOperation;
import org.bson.BsonDocument;
import org.bson.BsonJavaScript;
import org.bson.codecs.configuration.CodecRegistry;
import org.bson.conversions.Bson;
import java.util.Collection;
import java.util.concurrent.TimeUnit;
import static com.mongodb.ReadPreference.primary;
import static com.mongodb.assertions.Assertions.notNull;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
class MapReduceIterableImpl<TDocument, TResult> implements MapReduceIterable<TResult> {
private final MongoNamespace namespace;
private final Class<TDocument> documentClass;
private final Class<TResult> resultClass;
private final ReadPreference readPreference;
private final ReadConcern readConcern;
private final CodecRegistry codecRegistry;
private final AsyncOperationExecutor executor;
private final String mapFunction;
private final String reduceFunction;
private final WriteConcern writeConcern;
private boolean inline = true;
private String collectionName;
private String finalizeFunction;
private Bson scope;
private Bson filter;
private Bson sort;
private int limit;
private boolean jsMode;
private boolean verbose = true;
private long maxTimeMS;
private MapReduceAction action = MapReduceAction.REPLACE;
private String databaseName;
private boolean sharded;
private boolean nonAtomic;
private int batchSize;
private Boolean bypassDocumentValidation;
private Collation collation;
MapReduceIterableImpl(final MongoNamespace namespace, final Class<TDocument> documentClass, final Class<TResult> resultClass,
final CodecRegistry codecRegistry, final ReadPreference readPreference, final ReadConcern readConcern,
final WriteConcern writeConcern, final AsyncOperationExecutor executor, final String mapFunction,
final String reduceFunction) {
this.namespace = notNull("namespace", namespace);
this.documentClass = notNull("documentClass", documentClass);
this.resultClass = notNull("resultClass", resultClass);
this.codecRegistry = notNull("codecRegistry", codecRegistry);
this.readPreference = notNull("readPreference", readPreference);
this.readConcern = notNull("readConcern", readConcern);
this.writeConcern = notNull("writeConcern", writeConcern);
this.executor = notNull("executor", executor);
this.mapFunction = notNull("mapFunction", mapFunction);
this.reduceFunction = notNull("reduceFunction", reduceFunction);
}
@Override
public MapReduceIterable<TResult> collectionName(final String collectionName) {
this.collectionName = notNull("collectionName", collectionName);
this.inline = false;
return this;
}
@Override
public MapReduceIterable<TResult> finalizeFunction(final String finalizeFunction) {
this.finalizeFunction = finalizeFunction;
return this;
}
@Override
public MapReduceIterable<TResult> scope(final Bson scope) {
this.scope = scope;
return this;
}
@Override
public MapReduceIterable<TResult> sort(final Bson sort) {
this.sort = sort;
return this;
}
@Override
public MapReduceIterable<TResult> filter(final Bson filter) {
this.filter = filter;
return this;
}
@Override
public MapReduceIterable<TResult> limit(final int limit) {
this.limit = limit;
return this;
}
@Override
public MapReduceIterable<TResult> jsMode(final boolean jsMode) {
this.jsMode = jsMode;
return this;
}
@Override
public MapReduceIterable<TResult> verbose(final boolean verbose) {
this.verbose = verbose;
return this;
}
@Override
public MapReduceIterable<TResult> maxTime(final long maxTime, final TimeUnit timeUnit) {
notNull("timeUnit", timeUnit);
this.maxTimeMS = TimeUnit.MILLISECONDS.convert(maxTime, timeUnit);
return this;
}
@Override
public MapReduceIterable<TResult> action(final MapReduceAction action) {
this.action = action;
return this;
}
@Override
public MapReduceIterable<TResult> databaseName(final String databaseName) {
this.databaseName = databaseName;
return this;
}
@Override
public MapReduceIterable<TResult> sharded(final boolean sharded) {
this.sharded = sharded;
return this;
}
@Override
public MapReduceIterable<TResult> nonAtomic(final boolean nonAtomic) {
this.nonAtomic = nonAtomic;
return this;
}
@Override
public MapReduceIterable<TResult> batchSize(final int batchSize) {
this.batchSize = batchSize;
return this;
}
@Override
public MapReduceIterable<TResult> bypassDocumentValidation(final Boolean bypassDocumentValidation) {
this.bypassDocumentValidation = bypassDocumentValidation;
return this;
}
@Override
public MapReduceIterable<TResult> collation(final Collation collation) {
this.collation = collation;
return this;
}
@Override
public void toCollection(final SingleResultCallback<Void> callback) {
notNull("callback", callback);
if (inline) {
throw new IllegalStateException("The options must specify a non-inline result");
}
executor.execute(createMapReduceToCollectionOperation(),
new SingleResultCallback<MapReduceStatistics>() {
@Override
public void onResult(final MapReduceStatistics result, final Throwable t) {
callback.onResult(null, t);
}
});
}
@Override
public void first(final SingleResultCallback<TResult> callback) {
notNull("callback", callback);
execute().first(callback);
}
@Override
public void forEach(final Block<? super TResult> block, final SingleResultCallback<Void> callback) {
notNull("block", block);
notNull("callback", callback);
execute().forEach(block, callback);
}
@Override
public <A extends Collection<? super TResult>> void into(final A target, final SingleResultCallback<A> callback) {
notNull("target", target);
notNull("callback", callback);
execute().into(target, callback);
}
@Override
public <U> MongoIterable<U> map(final Function<TResult, U> mapper) {
return new MappingIterable<TResult, U>(this, mapper);
}
@Override
public void batchCursor(final SingleResultCallback<AsyncBatchCursor<TResult>> callback) {
notNull("callback", callback);
execute().batchCursor(callback);
}
MongoIterable<TResult> execute() {
if (inline) {
MapReduceWithInlineResultsOperation<TResult> operation =
new MapReduceWithInlineResultsOperation<TResult>(namespace,
new BsonJavaScript(mapFunction),
new BsonJavaScript(reduceFunction),
codecRegistry.get(resultClass))
.filter(toBsonDocument(filter))
.limit(limit)
.maxTime(maxTimeMS, MILLISECONDS)
.jsMode(jsMode)
.scope(toBsonDocument(scope))
.sort(toBsonDocument(sort))
.verbose(verbose)
.readConcern(readConcern)
.collation(collation);
if (finalizeFunction != null) {
operation.finalizeFunction(new BsonJavaScript(finalizeFunction));
}
return new OperationIterable<TResult>(operation, readPreference, executor);
} else {
MapReduceToCollectionOperation operation = createMapReduceToCollectionOperation();
String dbName = databaseName != null ? databaseName : namespace.getDatabaseName();
MongoIterable<TResult> delegated = new FindIterableImpl<TDocument, TResult>(new MongoNamespace(dbName, collectionName),
documentClass, resultClass, codecRegistry, primary(), readConcern, executor, new BsonDocument(),
new FindOptions().collation(collation)).batchSize(batchSize);
return new AwaitingWriteOperationIterable<TResult, MapReduceStatistics>(operation, executor, delegated);
}
}
private MapReduceToCollectionOperation createMapReduceToCollectionOperation() {
MapReduceToCollectionOperation operation = new MapReduceToCollectionOperation(namespace, new BsonJavaScript(mapFunction),
new BsonJavaScript(reduceFunction), collectionName, writeConcern)
.filter(toBsonDocument(filter))
.limit(limit)
.maxTime(maxTimeMS, MILLISECONDS)
.jsMode(jsMode)
.scope(toBsonDocument(scope))
.sort(toBsonDocument(sort))
.verbose(verbose)
.action(action.getValue())
.nonAtomic(nonAtomic)
.sharded(sharded)
.databaseName(databaseName)
.bypassDocumentValidation(bypassDocumentValidation)
.collation(collation);
if (finalizeFunction != null) {
operation.finalizeFunction(new BsonJavaScript(finalizeFunction));
}
return operation;
}
private BsonDocument toBsonDocument(final Bson document) {
return document == null ? null : document.toBsonDocument(documentClass, codecRegistry);
}
}