src/Lucene.Net.Tests/Store/TestLock.cs

using NUnit.Framework;
using System.IO;
using Assert = Lucene.Net.TestFramework.Assert;

namespace Lucene.Net.Store
{
    /*
     * 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 LuceneTestCase = Lucene.Net.Util.LuceneTestCase;

    [TestFixture]
    public class TestLock : LuceneTestCase
    {
        [Test]
        public virtual void TestObtain()
        {
            LockMock @lock = new LockMock(this);
            Lock.LOCK_POLL_INTERVAL = 10;

            try
            {
                @lock.Obtain(Lock.LOCK_POLL_INTERVAL);
                Assert.Fail("Should have failed to obtain lock");
            }
#pragma warning disable 168
            catch (IOException e)
#pragma warning restore 168
            {
                Assert.AreEqual(@lock.LockAttempts, 2, "should attempt to lock more than once");
            }
        }

        private class LockMock : Lock
        {
            private readonly TestLock outerInstance;

            public LockMock(TestLock outerInstance)
            {
                this.outerInstance = outerInstance;
            }

            public int LockAttempts;

            public override bool Obtain()
            {
                LockAttempts++;
                return false;
            }

            protected override void Dispose(bool disposing)
            {
                // do nothing
            }

            public override bool IsLocked()
            {
                return false;
            }
        }
    }
}