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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.connection;

import com.mongodb.ReadPreference;
import com.mongodb.connection.ClusterConnectionMode;
import com.mongodb.connection.ConnectionDescription;
import com.mongodb.internal.async.SingleResultCallback;
import com.mongodb.internal.connection.MessageSequences.EmptyMessageSequences;
import com.mongodb.internal.diagnostics.logging.Logger;
import com.mongodb.internal.diagnostics.logging.Loggers;
import com.mongodb.internal.session.SessionContext;
import com.mongodb.lang.Nullable;
import org.bson.BsonDocument;
import org.bson.FieldNameValidator;
import org.bson.codecs.Decoder;

import static com.mongodb.internal.async.ErrorHandlingResultCallback.errorHandlingCallback;

/**
 * This class is not part of the public API and may be removed or changed at any time
 */
public class DefaultServerConnection extends AbstractReferenceCounted implements Connection, AsyncConnection {
    private static final Logger LOGGER = Loggers.getLogger("connection");
    private final InternalConnection wrapped;
    private final ProtocolExecutor protocolExecutor;
    private final ClusterConnectionMode clusterConnectionMode;

    public DefaultServerConnection(final InternalConnection wrapped, final ProtocolExecutor protocolExecutor,
                            final ClusterConnectionMode clusterConnectionMode) {
        this.wrapped = wrapped;
        this.protocolExecutor = protocolExecutor;
        this.clusterConnectionMode = clusterConnectionMode;
    }

    @Override
    public DefaultServerConnection retain() {
        super.retain();
        return this;
    }

    @Override
    public int release() {
        int count = super.release();
        if (count == 0) {
            wrapped.close();
        }
        return count;
    }

    @Override
    public ConnectionDescription getDescription() {
        return wrapped.getDescription();
    }

    @Nullable
    @Override
    public  T command(final String database, final BsonDocument command, final FieldNameValidator fieldNameValidator,
            @Nullable final ReadPreference readPreference, final Decoder commandResultDecoder, final OperationContext operationContext) {
        return command(database, command, fieldNameValidator, readPreference, commandResultDecoder, operationContext, true, EmptyMessageSequences.INSTANCE);
    }

    @Nullable
    @Override
    public  T command(final String database, final BsonDocument command, final FieldNameValidator commandFieldNameValidator,
            @Nullable final ReadPreference readPreference, final Decoder commandResultDecoder,
            final OperationContext operationContext, final boolean responseExpected, final MessageSequences sequences) {
        return executeProtocol(
                new CommandProtocolImpl<>(database, command, commandFieldNameValidator, readPreference, commandResultDecoder,
                        responseExpected, sequences, clusterConnectionMode, operationContext),
                operationContext.getSessionContext());
    }

    @Override
    public  void commandAsync(final String database, final BsonDocument command, final FieldNameValidator fieldNameValidator,
            @Nullable final ReadPreference readPreference, final Decoder commandResultDecoder, final OperationContext operationContext,
            final SingleResultCallback callback) {
        commandAsync(database, command, fieldNameValidator, readPreference, commandResultDecoder,
                operationContext, true, EmptyMessageSequences.INSTANCE, callback);
    }

    @Override
    public  void commandAsync(final String database, final BsonDocument command, final FieldNameValidator commandFieldNameValidator,
            @Nullable final ReadPreference readPreference, final Decoder commandResultDecoder, final OperationContext operationContext,
            final boolean responseExpected, final MessageSequences sequences, final SingleResultCallback callback) {
        executeProtocolAsync(new CommandProtocolImpl<>(database, command, commandFieldNameValidator, readPreference,
                        commandResultDecoder, responseExpected, sequences, clusterConnectionMode, operationContext),
                operationContext.getSessionContext(), callback);
    }

    @Override
    public void markAsPinned(final PinningMode pinningMode) {
        wrapped.markAsPinned(pinningMode);
    }

    @Nullable
    private  T executeProtocol(final CommandProtocol protocol, final SessionContext sessionContext) {
        return protocolExecutor.execute(protocol, this.wrapped, sessionContext);
    }

    private  void executeProtocolAsync(final CommandProtocol protocol, final SessionContext sessionContext,
                                          final SingleResultCallback callback) {
        SingleResultCallback errHandlingCallback = errorHandlingCallback(callback, LOGGER);
        try {
            protocolExecutor.executeAsync(protocol, this.wrapped, sessionContext, errHandlingCallback);
        } catch (Throwable t) {
            errHandlingCallback.onResult(null, t);
        }
    }
}