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Socket.IO Client Library for Java

There is a newer version: 2.1.1

package io.socket.client;

import io.socket.emitter.Emitter;

public class On {

    private On() {}

    public static Handle on(final Emitter obj, final String ev, final Emitter.Listener fn) {
        obj.on(ev, fn);
        return new Handle() {
            @Override
            public void destroy() {
                obj.off(ev, fn);
            }
        };
    }

    public static interface Handle {

        public void destroy();
    }
}