ExamineComponent.cs

public class ProductComponent : IComponent
{
    private readonly IExamineManager _examineManager;
    private readonly ProductIndexCreator _productIndexCreator;

    public ProductComponent (IExamineManager examineManager, ProductIndexCreator productIndexCreator)
    {
        _examineManager = examineManager;
        _productIndexCreator = productIndexCreator;
    }

    public void Initialize()
    {      
        foreach (var index in _productIndexCreator.Create())
            _examineManager.AddIndex(index);
    }

    public void Terminate() { }
}

ProductComposer.cs

[RuntimeLevel(MinLevel = RuntimeLevel.Run)]
public class ProductComposer : IUserComposer
{
    public void Compose(Composition composition)
    {
        composition.Components().Append<ProductComponent>();

        composition.RegisterUnique<ProductIndexValueSetBuilder>();
        composition.Register<ProductIndexPopulator>(Lifetime.Singleton);
        composition.RegisterUnique<ProductIndexCreator>();
    }
}

ProductIndexCreator.cs

public class ProductIndexCreator : LuceneIndexCreator
{
    public override IEnumerable<IIndex> Create()
    {
        var index = new LuceneIndex("ProductIndex",
            CreateFileSystemLuceneDirectory("ProductIndex"),
            new FieldDefinitionCollection(
                new FieldDefinition("name", FieldDefinitionTypes.FullTextSortable),
                new FieldDefinition("price", FieldDefinitionTypes.FullText)
            ),
            new StandardAnalyzer(Version.LUCENE_30));

        return new[] { index };
    }
}

ProductIndexPopulator.cs

public class ProductIndexPopulator : IndexPopulator
{
    private readonly ProductIndexValueSetBuilder _productValueSetBuilder;
    private readonly IProductService _productService;

    public ProductIndexPopulator(ProductIndexValueSetBuilder productValueSetBuilder, IProductService productService)
    {
        _productValueSetBuilder = productValueSetBuilder;
        _productService = productService;

        RegisterIndex("ProductIndex");
    }

    protected override void PopulateIndexes(IReadOnlyList<IIndex> indexes)
    {
        var products = _productService.GetAll();
        if (products != null && products.Any())
        {
            foreach (var index in indexes)
            {
                index.IndexItems(_productValueSetBuilder.GetValueSets(products));
            }
        }
    }
}

ProductIndexValueBuilder.cs

public class ProductIndexValueSetBuilder : IValueSetBuilder<Product>
{
    public IEnumerable<ValueSet> GetValueSets(params Product[] products)
    {
        foreach (var product in products)
        {
            var indexValues = new Dictionary<string, object>
            {
                ["name"] = product.Name,
                ["price"] = product.Price
            };

            var valueSet = new ValueSet(product.Id.ToString(), "product", indexValues);

            yield return valueSet;
        }
    }
}

Thanks Morten, I’ve updated Umbraco.PDF for V8 so I’m sure I’ll get some feedback when Shannon reviews that PR. Thanks for this gist, it’s been super helpful.

Please don't manually unlock the index. There should be no need to do this and if it's locked then we need to figure out why since this will be covering up another issue. The usage of CreateFileSystemLuceneDirectory makes sure that the correct lucene lock policy is used and then we already unlock all LuceneIndex's on startup based on this locking policy. The above code abides by this.

With all my tests locally I cannot replicate indexes being locked on restart or anything.

Am currently trying to figure this out with @hartviglarsen if he can replicate.

Any news on this with index's not getting unlocked? :)

It should be fixed in Umbraco 8.1.2. Evan Moore

…

On Aug 29, 2019, at 2:23 AM, AndersBrohus-MySupport ***@***.***> wrote:  Any news on this with index's not getting unlocked? :) — You are receiving this because you commented. Reply to this email directly, view it on GitHub, or mute the thread.

Following the example... I got System.InvalidOperationException: 'Unable to resolve type: Umbraco.Web.Search.ExamineComponent, service name: OMG.... I'm getting mad to migrate to V8 ! :-)