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The Java operations layer for the MongoDB Java Driver. Third parties can wrap this layer to provide custom higher-level APIs

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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.internal.operation;

import com.mongodb.internal.async.SingleResultCallback;
import com.mongodb.internal.binding.AsyncReadBinding;
import com.mongodb.internal.binding.ReadBinding;
import org.bson.BsonDocument;
import org.bson.codecs.Decoder;

import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.internal.operation.AsyncOperationHelper.executeRetryableReadAsync;
import static com.mongodb.internal.operation.CommandOperationHelper.CommandCreator;
import static com.mongodb.internal.operation.SyncOperationHelper.executeRetryableRead;

/**
 * An operation that executes an arbitrary command that reads from the server.
 *
 * This class is not part of the public API and may be removed or changed at any time
 */
public class CommandReadOperation implements AsyncReadOperation, ReadOperation {
    private final String databaseName;
    private final BsonDocument command;
    private final Decoder decoder;

    public CommandReadOperation(final String databaseName, final BsonDocument command, final Decoder decoder) {
        this.databaseName = notNull("databaseName", databaseName);
        this.command = notNull("command", command);
        this.decoder = notNull("decoder", decoder);
    }

    @Override
    public T execute(final ReadBinding binding) {
        return executeRetryableRead(binding, databaseName, getCommandCreator(), decoder, (result, source, connection) -> result, false);
    }

    @Override
    public void executeAsync(final AsyncReadBinding binding, final SingleResultCallback callback) {
        executeRetryableReadAsync(binding, databaseName, getCommandCreator(), decoder, (result, source, connection) -> result,
                false, callback);
    }

    private CommandCreator getCommandCreator() {
        return (serverDescription, connectionDescription) -> command;
    }
}