/*
 * Copyright 2019 Red Hat, Inc.
 *
 * Red Hat licenses this file to you 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 io.vertx.cassandra.impl;

import com.datastax.oss.driver.api.core.CqlSession;
import io.vertx.core.impl.TaskQueue;
import io.vertx.core.shareddata.Shareable;

import java.util.Objects;

Author:Thomas Segismont
/** * @author Thomas Segismont */
class SessionHolder implements Shareable { final TaskQueue connectionQueue; final CqlSession session; final int refCount; SessionHolder() { connectionQueue = new TaskQueue(); session = null; refCount = 1; } private SessionHolder(TaskQueue connectionQueue, CqlSession session, int refCount) { this.connectionQueue = connectionQueue; this.session = session; this.refCount = refCount; } SessionHolder connected(CqlSession session) { Objects.requireNonNull(session); if (this.session != null) { throw new IllegalStateException(); } return new SessionHolder(connectionQueue, session, refCount); } SessionHolder increment() { return new SessionHolder(connectionQueue, session, refCount + 1); } SessionHolder decrement() { if (refCount < 1) { throw new IllegalArgumentException(); } return new SessionHolder(connectionQueue, session, refCount - 1); } }