/*
 * Copyright 2020-2020 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
 *
 *      https://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 org.springframework.cloud.fn.common.tensorflow;

import org.tensorflow.Graph;
import org.tensorflow.Session;
import org.tensorflow.op.Ops;

/**
 * @author Christian Tzolov
 */
class AutoCloseableSession implements AutoCloseable {

	private Session session;

	/**
	 * Note: don't call this method inside the constructor.
	 */
	protected void init() {
		Graph graph = this.doCreateGraph();
		this.doGraphDefinition(Ops.create(graph));
		this.session = new Session(graph);
	}

	protected Graph doCreateGraph() {
		return new Graph();
	}

	protected void doGraphDefinition(Ops tf) {
	}

	protected Session getSession() {
		if (this.session == null) {
			init();
		}
		return this.session;
	}

	@Override
	public void close() {
		this.doClose();
		if (this.session != null) {
			this.session.close();
		}
	}

	protected void doClose() {
	}
}
