package test.byteman;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Test case for BYTEMAN-216
 * @see https://issues.jboss.org/browse/BYTEMAN-216
 * @author wschell
 */
public class BytemanBugMonitorEnter {
	public static void main(String[] args) throws Exception {
		System.out.println("start");
		try {
			new BytemanBugMonitorEnter().getData("dummy");
		}
		catch (Throwable t) {
			t.printStackTrace();
		}

		System.out.println("done");
	}
	
	private List<String> strings = Collections.emptyList();

	/**
	 * Reduced original method, so it still triggers the bug.
	 * Original method did a lookup in some cache.
	 */
	public Object getData(String name) {
		List<Object> data = null;
		synchronized (DBIndex.class) {
			String indexName = "MyKey";
			
			// lookup existing cache entry
			Map<String, List<Object>> cache = (Map<String, List<Object>>) DBIndex.getCustomIndex(indexName);
			if (cache == null) {
				// cache miss, create new cache entry
				cache = new HashMap<String, List<Object>>();
				
				// create cache entries
				List<Object> cachedData = new ArrayList<Object>();
				// XXX: this loop triggers the Byteman bug!
				// XXX: the loop body is irrelevant
				for (String s : strings) {
					cachedData.add(s);
				}
				cache.put(name, cachedData);

				DBIndex.addCustomIndex(indexName, cache);
			}
			// use cache
			data = cache.get(name);
			if (data == null) {
				data = Collections.emptyList();
			}
		}

		return data;
	}

	/**
	 * Dummy class.
	 */
	public static class DBIndex {
		public static Map<String, List<Object>> getCustomIndex(String customKey) {
			return Collections.emptyMap();
		}

		public static void addCustomIndex(String customKey,
				Map<String, List<Object>> cache) {
		}
	}
}