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JSON schema-based messages for Cucumber's inter-process communication

There is a newer version: 27.0.2

package io.cucumber.messages;

public interface IdGenerator {
    String newId();

    class Incrementing implements IdGenerator {
        private int next = 0;

        @Override
        public String newId() {
            return Integer.toString(next++);
        }
    }

    class UUID implements IdGenerator {
        @Override
        public String newId() {
            return java.util.UUID.randomUUID().toString();
        }
    }
}