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There is a newer version: 2.0.0-rc-1

/*
 * Copyright 2013 the original author or authors.
 *
 * 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 ratpack.handling.internal;

import io.netty.buffer.ByteBuf;
import ratpack.func.Action;
import ratpack.func.Function;
import ratpack.handling.Handler;
import ratpack.handling.Handlers;
import ratpack.reload.internal.ClassUtil;
import ratpack.reload.internal.ReloadableFileBackedFactory;

import java.io.File;
import java.nio.file.Path;
import java.util.LinkedList;
import java.util.List;

public class ChainBuilders {

  public static  Handler build(boolean reloadable, final Function, ? extends T> toChainBuilder, final Action chainBuilderAction) throws Exception {
    if (reloadable) {
      File classFile = ClassUtil.getClassFile(chainBuilderAction);
      if (classFile != null) {
        ReloadableFileBackedFactory factory = new ReloadableFileBackedFactory<>(classFile.toPath(), true, new ReloadableFileBackedFactory.Producer() {
          @Override
          public Handler produce(Path file, ByteBuf bytes) throws Exception {
            return create(toChainBuilder, chainBuilderAction);
          }
        });
        return new FactoryHandler(factory);
      }
    }

    return create(toChainBuilder, chainBuilderAction);
  }

  private static  Handler create(Function, ? extends T> toChainBuilder, Action chainBuilderAction) throws Exception {
    List handlers = new LinkedList<>();
    T chainBuilder = toChainBuilder.apply(handlers);
    chainBuilderAction.execute(chainBuilder);
    return Handlers.chain(handlers.toArray(new Handler[handlers.size()]));
  }

}