ch-commons-util/src/main/java/com/cloudhopper/commons/util/windowing/Window.java [488:497]:
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        if (!this.futures.containsKey(key)) {
            return null;
        }

        this.lock.lockInterruptibly();
        try {
            // try to remove future from window
            DefaultWindowFuture<K,R,P> future = this.futures.remove(key);
            if (future == null) {
                return null;
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ch-commons-util/src/main/java/com/cloudhopper/commons/util/windowing/Window.java [530:539]:
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        if (!this.futures.containsKey(key)) {
            return null;
        }

        this.lock.lockInterruptibly();
        try {
            // try to remove future from window
            DefaultWindowFuture<K,R,P> future = this.futures.remove(key);
            if (future == null) {
                return null;
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