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96 lines
3.0 KiB
96 lines
3.0 KiB
/* Copyright 2010 10gen Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading;
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using MongoDB.Bson;
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using MongoDB.Bson.IO;
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namespace MongoDB.Driver.Internal {
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internal abstract class MongoRequestMessage : MongoMessage, IDisposable {
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#region private static fields
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private static int lastRequestId = 0;
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#endregion
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#region protected fields
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protected bool disposed = false;
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protected BsonBuffer buffer;
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protected bool disposeBuffer;
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protected int messageStartPosition = -1; // start position in buffer for backpatching messageLength
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#endregion
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#region constructors
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protected MongoRequestMessage(
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MessageOpcode opcode
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)
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: this(opcode, null) {
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}
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protected MongoRequestMessage(
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MessageOpcode opcode,
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BsonBuffer buffer // not null if piggybacking this message onto an existing buffer
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)
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: base(opcode) {
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this.buffer = buffer ?? new BsonBuffer();
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this.disposeBuffer = buffer == null; // only call Dispose if we allocated the buffer
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this.requestId = Interlocked.Increment(ref lastRequestId);
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}
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#endregion
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#region public propertieds
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public BsonBuffer Buffer {
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get { return buffer; }
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}
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#endregion
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#region public methods
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public void Dispose() {
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if (!disposed) {
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if (disposeBuffer) {
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buffer.Dispose();
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}
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buffer = null;
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disposed = true;
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}
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}
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#endregion
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#region internal methods
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internal void WriteToBuffer() {
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// this method is sometimes called more than once (see MongoConnection and MongoCollection)
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if (messageStartPosition == -1) {
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messageStartPosition = buffer.Position;
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WriteMessageHeaderTo(buffer);
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WriteBody();
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BackpatchMessageLength();
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}
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}
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#endregion
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#region protected methods
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protected void BackpatchMessageLength() {
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messageLength = buffer.Position - messageStartPosition;
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buffer.Backpatch(messageStartPosition, messageLength);
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}
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protected abstract void WriteBody();
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#endregion
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}
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}
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