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Reader-Writer Locks - Part III

Of course there are many improvements we can make here to reduce contention; for example, following the best practice of reducing the time a thread spends inside a critical section:

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
class Reader extends Consumer implements Runnable {
public void run() {
int[] deepCopy;
synchronized (Shared.cache) {
int[] value = Shared.cache.get("key");
deepCopy = Arrays.copyOf(value, value.length);
// {...}
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