/*
 * Copyright 2005 JBoss Inc
 *
 * 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 org.drools.model.impl;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;

public class NamesGenerator {

    private static int index = 0;

    private static Map<String, AtomicInteger> indexes = new HashMap<>();

    private NamesGenerator() { }

    public static String generateName(String topic) {
        return "$" + topic + "$" + indexes.computeIfAbsent( topic, t -> new AtomicInteger() ).incrementAndGet() + "$";
    }
}

/*
 * Copyright 2005 JBoss Inc
 *
 * 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 org.drools.model.impl;

import java.util.concurrent.atomic.AtomicInteger;

public class NamesGenerator {

    private static final AtomicInteger index = new AtomicInteger();

    private NamesGenerator() { }

    public static String generateName(String topic) {
        return "$" + topic + "$" + index.incrementAndGet() + "$";
    }
}

fix concurrent access to NamesGenerator in executable model