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/***************************************************************************
 * Copyright 2022 Kieker Project (http://kieker-monitoring.net)
 *
 * 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 kieker.common.registry.writer;

import java.util.HashMap;
import java.util.Map;

import kieker.common.registry.IRegistryListener;

/**
 * Manages a writer registry. It triggers an registry listener for every new entry.
 *
 * @author Christian Wulf (chw)
 *
 * @since 1.13
 */
public class WriterRegistry implements IWriterRegistry {

	private final Map storage = new HashMap<>(); // NOPMD (synchronization is not necessary)
	/** id of the next value which will be registered. */
	private int nextId;
	/** the listener of this registry which is notified upon a newly registered value. */
	private final IRegistryListener registryListener;
	/** ID of this registry to distinguish multiple ones. */
	private final long id;

	/**
	 * Create a new writer registry.
	 *
	 * @param registryListener
	 *            registry listener
	 */
	public WriterRegistry(final IRegistryListener registryListener) {
		this.registryListener = registryListener;
		this.id = WriterRegistryUtil.generateId();
	}

	@Override
	public int getId(final String value) {
		final Integer valueId = this.storage.get(value);
		if (valueId == null) {
			this.register(value);
			return this.storage.get(value);
		} else {
			return valueId;
		}
	}

	@Override
	public void register(final String value) {
		if (!this.storage.containsKey(value)) {
			final int valueId = this.nextId++;
			this.storage.put(value, valueId);
			this.registryListener.onNewRegistryEntry(value, valueId);
		}
	}

	@Override
	public long getId() {
		return this.id;
	}

}