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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
using System;
namespace Qpid.Client
{
public abstract class Closeable
{
/// <summary>
/// Used to ensure orderly closing of the object. The only method that is allowed to be called
/// from another thread of control is close().
/// </summary>
protected readonly object _closingLock = new object();
/// <summary>
/// All access to this field should be using the Inerlocked class, to make it atomic.
/// Hence it is an int since you cannot use a bool with the Interlocked class.
/// </summary>
protected int _closed = NOT_CLOSED;
protected const int CLOSED = 1;
protected const int NOT_CLOSED = 2;
/// <summary>
/// Checks the not closed.
/// </summary>
protected void CheckNotClosed()
{
if (_closed == CLOSED)
{
throw new InvalidOperationException("Object " + ToString() + " has been closed");
}
}
/// <summary>
/// Gets a value indicating whether this <see cref="Closeable"/> is closed.
/// </summary>
/// <value><c>true</c> if closed; otherwise, <c>false</c>.</value>
public bool Closed
{
get
{
return _closed == CLOSED;
}
}
/// <summary>
/// Close the resource
/// </summary>
/// <exception cref="QpidMessagingException">If something goes wrong</exception>
public abstract void Close();
}
}
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