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The MongoDB Java Driver uber-artifact, containing mongodb-driver, mongodb-driver-core, and bson
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/*
 * Copyright (c) 2008-2014 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.Function;
import com.mongodb.MongoNamespace;
import com.mongodb.ServerAddress;
import com.mongodb.async.AsyncBatchCursor;
import com.mongodb.async.SingleResultCallback;
import com.mongodb.binding.AsyncConnectionSource;
import com.mongodb.binding.AsyncReadBinding;
import com.mongodb.binding.AsyncWriteBinding;
import com.mongodb.binding.ConnectionSource;
import com.mongodb.binding.ReadBinding;
import com.mongodb.binding.WriteBinding;
import com.mongodb.connection.AsyncConnection;
import com.mongodb.connection.Connection;
import com.mongodb.connection.ConnectionDescription;
import com.mongodb.connection.QueryResult;
import com.mongodb.connection.ServerVersion;
import org.bson.BsonDocument;
import org.bson.BsonInt64;
import org.bson.codecs.Decoder;

import java.util.Collections;

import static com.mongodb.internal.async.ErrorHandlingResultCallback.errorHandlingCallback;
import static java.util.Arrays.asList;

final class OperationHelper {

    interface CallableWithConnection {
        T call(Connection connection);
    }

    interface CallableWithConnectionAndSource {
        T call(ConnectionSource source, Connection connection);
    }

    interface AsyncCallableWithConnection {
        void call(AsyncConnection connection, Throwable t);
    }

    interface AsyncCallableWithConnectionAndSource {
        void call(AsyncConnectionSource source, AsyncConnection connection, Throwable t);
    }

    static class IdentityTransformer implements Function {
        @Override
        public T apply(final T t) {
            return t;
        }
    }

    static class VoidTransformer implements Function {
        @Override
        public Void apply(final T t) {
            return null;
        }
    }

    static  QueryBatchCursor createEmptyBatchCursor(final MongoNamespace namespace, final Decoder decoder,
                                                          final ServerAddress serverAddress, final int batchSize) {
        return new QueryBatchCursor(new QueryResult(namespace, Collections.emptyList(), 0L,
                                                          serverAddress),
                                       0, batchSize, decoder);
    }

    static  AsyncBatchCursor createEmptyAsyncBatchCursor(final MongoNamespace namespace, final Decoder decoder,
                                                               final ServerAddress serverAddress, final int batchSize) {
        return new AsyncQueryBatchCursor(new QueryResult(namespace, Collections.emptyList(), 0L, serverAddress), 0, batchSize,
                decoder);
    }

    static  BatchCursor cursorDocumentToBatchCursor(final BsonDocument cursorDocument, final Decoder decoder,
                                                          final ConnectionSource source, final int batchSize) {
        return new QueryBatchCursor(OperationHelper.cursorDocumentToQueryResult(cursorDocument,
                                                                                      source.getServerDescription().getAddress()),
                                       0, batchSize, decoder, source);
    }

    static  AsyncBatchCursor cursorDocumentToAsyncBatchCursor(final BsonDocument cursorDocument, final Decoder decoder,
                                                                    final AsyncConnectionSource source, final AsyncConnection connection,
                                                                    final int batchSize) {
        return new AsyncQueryBatchCursor(OperationHelper.cursorDocumentToQueryResult(cursorDocument,
                                                                                           source.getServerDescription().getAddress()),
                                            0, batchSize, decoder, source, connection);
    }


    static  QueryResult cursorDocumentToQueryResult(final BsonDocument cursorDocument, final ServerAddress serverAddress) {
        long cursorId = ((BsonInt64) cursorDocument.get("id")).getValue();
        MongoNamespace queryResultNamespace = new MongoNamespace(cursorDocument.getString("ns").getValue());
        return new QueryResult(queryResultNamespace, BsonDocumentWrapperHelper.toList(cursorDocument, "firstBatch"), cursorId,
                serverAddress);
    }

    static  SingleResultCallback releasingCallback(final SingleResultCallback wrapped, final AsyncConnection connection) {
        return new ConnectionReleasingWrappedCallback(wrapped, null, connection);
    }

    static  SingleResultCallback releasingCallback(final SingleResultCallback wrapped, final AsyncConnectionSource source,
                                                         final AsyncConnection connection) {
        return new ConnectionReleasingWrappedCallback(wrapped, source, connection);
    }

    private static class ConnectionReleasingWrappedCallback implements SingleResultCallback {
        private final SingleResultCallback wrapped;
        private final AsyncConnectionSource source;
        private final AsyncConnection connection;

        ConnectionReleasingWrappedCallback(final SingleResultCallback wrapped, final AsyncConnectionSource source,
                                           final AsyncConnection connection) {
            this.wrapped = wrapped;
            this.source = source;
            this.connection = connection;
        }

        @Override
        public void onResult(final T result, final Throwable t) {
            if (connection != null) {
                connection.release();
            }
            if (source != null) {
                source.release();
            }
            wrapped.onResult(result, t);
        }
    }

    static boolean serverIsAtLeastVersionTwoDotSix(final ConnectionDescription description) {
        return serverIsAtLeastVersion(description, new ServerVersion(2, 6));
    }

    static boolean serverIsAtLeastVersionThreeDotZero(final ConnectionDescription description) {
        return serverIsAtLeastVersion(description, new ServerVersion(asList(3, 0, 0)));
    }

    static boolean serverIsAtLeastVersion(final ConnectionDescription description, final ServerVersion serverVersion) {
        return description.getServerVersion().compareTo(serverVersion) >= 0;
    }

    static  T withConnection(final ReadBinding binding, final CallableWithConnection callable) {
        ConnectionSource source = binding.getReadConnectionSource();
        try {
            return withConnectionSource(source, callable);
        } finally {
            source.release();
        }
    }

    static  T withConnection(final ReadBinding binding, final CallableWithConnectionAndSource callable) {
        ConnectionSource source = binding.getReadConnectionSource();
        try {
            return withConnectionSource(source, callable);
        } finally {
            source.release();
        }
    }

    static  T withConnection(final WriteBinding binding, final CallableWithConnection callable) {
        ConnectionSource source = binding.getWriteConnectionSource();
        try {
            return withConnectionSource(source, callable);
        } finally {
            source.release();
        }
    }

    static  T withConnectionSource(final ConnectionSource source, final CallableWithConnection callable) {
        Connection connection = source.getConnection();
        try {
            return callable.call(connection);
        } finally {
            connection.release();
        }
    }

    static  T withConnectionSource(final ConnectionSource source, final CallableWithConnectionAndSource callable) {
        Connection connection = source.getConnection();
        try {
            return callable.call(source, connection);
        } finally {
            connection.release();
        }
    }

    static void withConnection(final AsyncWriteBinding binding, final AsyncCallableWithConnection callable) {
        binding.getWriteConnectionSource(errorHandlingCallback(new AsyncCallableWithConnectionCallback(callable)));
    }

    static void withConnection(final AsyncReadBinding binding, final AsyncCallableWithConnection callable) {
        binding.getReadConnectionSource(errorHandlingCallback(new AsyncCallableWithConnectionCallback(callable)));
    }

    static void withConnection(final AsyncReadBinding binding, final AsyncCallableWithConnectionAndSource callable) {
        binding.getReadConnectionSource(errorHandlingCallback(new AsyncCallableWithConnectionAndSourceCallback(callable)));
    }

    private static class AsyncCallableWithConnectionCallback implements SingleResultCallback {
        private final AsyncCallableWithConnection callable;
        public AsyncCallableWithConnectionCallback(final AsyncCallableWithConnection callable) {
            this.callable = callable;
        }
        @Override
        public void onResult(final AsyncConnectionSource source, final Throwable t) {
            if (t != null) {
                callable.call(null, t);
            } else {
                withConnectionSource(source, callable);
            }
        }
    }

    private static void withConnectionSource(final AsyncConnectionSource source, final AsyncCallableWithConnection callable) {
        source.getConnection(new SingleResultCallback() {
            @Override
            public void onResult(final AsyncConnection connection, final Throwable t) {
                source.release();
                if (t != null) {
                    callable.call(null, t);
                } else {
                    callable.call(connection, null);
                }
            }
        });
    }

    private static void withConnectionSource(final AsyncConnectionSource source, final AsyncCallableWithConnectionAndSource callable) {
        source.getConnection(new SingleResultCallback() {
            @Override
            public void onResult(final AsyncConnection result, final Throwable t) {
                callable.call(source, result, t);
            }
        });
    }

    private static class AsyncCallableWithConnectionAndSourceCallback implements SingleResultCallback {
        private final AsyncCallableWithConnectionAndSource callable;

        public AsyncCallableWithConnectionAndSourceCallback(final AsyncCallableWithConnectionAndSource callable) {
            this.callable = callable;
        }

        @Override
        public void onResult(final AsyncConnectionSource source, final Throwable t) {
            if (t != null) {
                callable.call(null, null, t);
            } else {
                withConnectionSource(source, callable);
            }
        }
    }

    private OperationHelper() {
    }
}