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• MapReduceIterableImpl.java

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com.mongodb.async.client.MapReduceIterableImpl Maven / Gradle / Ivy

/*
 * 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.async.client;

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.binding.AsyncReadBinding;
import com.mongodb.binding.AsyncWriteBinding;
import com.mongodb.client.model.Collation;
import com.mongodb.client.model.FindOptions;
import com.mongodb.client.model.MapReduceAction;
import com.mongodb.internal.operation.AsyncOperations;
import com.mongodb.lang.Nullable;
import com.mongodb.operation.AsyncReadOperation;
import com.mongodb.operation.AsyncWriteOperation;
import com.mongodb.operation.MapReduceAsyncBatchCursor;
import com.mongodb.operation.MapReduceStatistics;
import org.bson.BsonDocument;
import org.bson.codecs.configuration.CodecRegistry;
import org.bson.conversions.Bson;

import java.util.concurrent.TimeUnit;

import static com.mongodb.ReadPreference.primary;
import static com.mongodb.assertions.Assertions.notNull;

class MapReduceIterableImpl extends MongoIterableImpl implements MapReduceIterable {
    private final AsyncOperations operations;
    private final MongoNamespace namespace;
    private final Class resultClass;
    private final String mapFunction;
    private final String reduceFunction;

    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 Boolean bypassDocumentValidation;
    private Collation collation;

    MapReduceIterableImpl(@Nullable final ClientSession clientSession, final MongoNamespace namespace, final Class documentClass,
                          final Class resultClass, final CodecRegistry codecRegistry, final ReadPreference readPreference,
                          final ReadConcern readConcern, final WriteConcern writeConcern, final OperationExecutor executor,
                          final String mapFunction, final String reduceFunction) {
        super(clientSession, executor, readConcern, readPreference, false);
        this.operations = new AsyncOperations(namespace, documentClass, readPreference, codecRegistry, readConcern, writeConcern,
                false, false);
        this.namespace = notNull("namespace", namespace);
        this.resultClass = notNull("resultClass", resultClass);
        this.mapFunction = notNull("mapFunction", mapFunction);
        this.reduceFunction = notNull("reduceFunction", reduceFunction);
    }

    @Override
    public MapReduceIterable collectionName(final String collectionName) {
        this.collectionName = notNull("collectionName", collectionName);
        this.inline = false;
        return this;
    }

    @Override
    public MapReduceIterable finalizeFunction(@Nullable final String finalizeFunction) {
        this.finalizeFunction = finalizeFunction;
        return this;
    }

    @Override
    public MapReduceIterable scope(@Nullable final Bson scope) {
        this.scope = scope;
        return this;
    }

    @Override
    public MapReduceIterable sort(@Nullable final Bson sort) {
        this.sort = sort;
        return this;
    }

    @Override
    public MapReduceIterable filter(@Nullable final Bson filter) {
        this.filter = filter;
        return this;
    }

    @Override
    public MapReduceIterable limit(final int limit) {
        this.limit = limit;
        return this;
    }

    @Override
    public MapReduceIterable jsMode(final boolean jsMode) {
        this.jsMode = jsMode;
        return this;
    }

    @Override
    public MapReduceIterable verbose(final boolean verbose) {
        this.verbose = verbose;
        return this;
    }

    @Override
    public MapReduceIterable maxTime(final long maxTime, final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        this.maxTimeMS = TimeUnit.MILLISECONDS.convert(maxTime, timeUnit);
        return this;
    }

    @Override
    public MapReduceIterable action(final MapReduceAction action) {
        this.action = action;
        return this;
    }

    @Override
    public MapReduceIterable databaseName(@Nullable final String databaseName) {
        this.databaseName = databaseName;
        return this;
    }

    @Override
    public MapReduceIterable sharded(final boolean sharded) {
        this.sharded = sharded;
        return this;
    }

    @Override
    public MapReduceIterable nonAtomic(final boolean nonAtomic) {
        this.nonAtomic = nonAtomic;
        return this;
    }

    @Override
    public MapReduceIterable batchSize(final int batchSize) {
        super.batchSize(batchSize);
        return this;
    }

    @Override
    public MapReduceIterable bypassDocumentValidation(@Nullable final Boolean bypassDocumentValidation) {
        this.bypassDocumentValidation = bypassDocumentValidation;
        return this;
    }

    @Override
    public MapReduceIterable collation(@Nullable final Collation collation) {
        this.collation = collation;
        return this;
    }

    @Override
    public void toCollection(final SingleResultCallback callback) {
        notNull("callback", callback);
        if (inline) {
            throw new IllegalStateException("The options must specify a non-inline result");
        }
        getExecutor().execute(createMapReduceToCollectionOperation(), getReadConcern(), callback);
    }

    @Override
    ReadPreference getReadPreference() {
        if (inline) {
            return super.getReadPreference();
        } else {
            return primary();
        }
    }

    @Override
    AsyncReadOperation> asAsyncReadOperation() {
        if (inline) {
            return createMapReduceInlineOperation();
        } else {
            return new WriteOperationThenCursorReadOperation(createMapReduceToCollectionOperation(), createFindOperation());
        }
    }

    private WrappedMapReduceReadOperation createMapReduceInlineOperation() {
        return new WrappedMapReduceReadOperation(operations.mapReduce(mapFunction, reduceFunction, finalizeFunction,
                resultClass, filter, limit, maxTimeMS, jsMode, scope, sort, verbose, collation));
    }

    private WrappedMapReduceWriteOperation createMapReduceToCollectionOperation() {
        return new WrappedMapReduceWriteOperation(operations.mapReduceToCollection(databaseName, collectionName, mapFunction,
                reduceFunction, finalizeFunction, filter, limit, maxTimeMS, jsMode, scope, sort, verbose, action, nonAtomic, sharded,
                bypassDocumentValidation, collation));
    }

    private AsyncReadOperation> createFindOperation() {
        String dbName = databaseName != null ? databaseName : namespace.getDatabaseName();
        FindOptions findOptions = new FindOptions().collation(collation);
        Integer batchSize = getBatchSize();
        if (batchSize != null) {
            findOptions.batchSize(batchSize);
        }
        return operations.find(new MongoNamespace(dbName, collectionName), new BsonDocument(), resultClass, findOptions);
    }

    // this could be inlined, but giving it a name so that it's unit-testable
    static class WrappedMapReduceReadOperation implements AsyncReadOperation> {
        private final AsyncReadOperation> operation;

        AsyncReadOperation> getOperation() {
            return operation;
        }

        WrappedMapReduceReadOperation(final AsyncReadOperation> operation) {
            this.operation = operation;
        }

        @Override
        public void executeAsync(final AsyncReadBinding binding, final SingleResultCallback> callback) {
            operation.executeAsync(binding, new SingleResultCallback>() {
                @Override
                public void onResult(final MapReduceAsyncBatchCursor batchCursor, final Throwable t) {
                    callback.onResult(batchCursor, t);
                }
            });
        }
    }

    static class WrappedMapReduceWriteOperation implements AsyncWriteOperation {
        private final AsyncWriteOperation operation;

        AsyncWriteOperation getOperation() {
            return operation;
        }

        WrappedMapReduceWriteOperation(final AsyncWriteOperation operation) {
            this.operation = operation;
        }

        @Override
        public void executeAsync(final AsyncWriteBinding binding, final SingleResultCallback callback) {
            operation.executeAsync(binding, new SingleResultCallback() {
                @Override
                public void onResult(final MapReduceStatistics result, final Throwable t) {
                    callback.onResult(null, t);
                }
            });
        }
    }
}