MidiScope/Application/src/main/java/com/example/android/common/midi/EventScheduler.java [154:171]:
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    public void add(SchedulableEvent event) {
        synchronized (lock) {
            FastEventQueue list = mEventBuffer.get(event.getTimestamp());
            if (list == null) {
                long lowestTime = mEventBuffer.isEmpty() ? Long.MAX_VALUE
                        : mEventBuffer.firstKey();
                list = new FastEventQueue(event);
                mEventBuffer.put(event.getTimestamp(), list);
                // If the event we added is earlier than the previous earliest
                // event then notify any threads waiting for the next event.
                if (event.getTimestamp() < lowestTime) {
                    lock.notify();
                }
            } else {
                list.add(event);
            }
        }
    }
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MidiSynth/Application/src/main/java/com/example/android/common/midi/EventScheduler.java [154:171]:
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    public void add(SchedulableEvent event) {
        synchronized (lock) {
            FastEventQueue list = mEventBuffer.get(event.getTimestamp());
            if (list == null) {
                long lowestTime = mEventBuffer.isEmpty() ? Long.MAX_VALUE
                        : mEventBuffer.firstKey();
                list = new FastEventQueue(event);
                mEventBuffer.put(event.getTimestamp(), list);
                // If the event we added is earlier than the previous earliest
                // event then notify any threads waiting for the next event.
                if (event.getTimestamp() < lowestTime) {
                    lock.notify();
                }
            } else {
                list.add(event);
            }
        }
    }
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