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27 package org.apache.hc.client5.http.schedule;
28
29 import java.util.concurrent.ConcurrentHashMap;
30 import java.util.concurrent.ConcurrentMap;
31 import java.util.concurrent.atomic.AtomicInteger;
32
33 import org.apache.hc.core5.annotation.Contract;
34 import org.apache.hc.core5.annotation.ThreadingBehavior;
35 import org.apache.hc.core5.util.Args;
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44 @Contract(threading = ThreadingBehavior.SAFE)
45 public final class ConcurrentCountMap<T> {
46
47 private final ConcurrentMap<T, AtomicInteger> map;
48
49 public ConcurrentCountMap() {
50 this.map = new ConcurrentHashMap<>();
51 }
52
53 public int getCount(final T identifier) {
54 Args.notNull(identifier, "Identifier");
55 final AtomicInteger count = map.get(identifier);
56 return count != null ? count.get() : 0;
57 }
58
59 public void resetCount(final T identifier) {
60 Args.notNull(identifier, "Identifier");
61 map.remove(identifier);
62 }
63
64 public int increaseCount(final T identifier) {
65 Args.notNull(identifier, "Identifier");
66 final AtomicInteger count = get(identifier);
67 return count.incrementAndGet();
68 }
69
70 private AtomicInteger get(final T identifier) {
71 AtomicInteger entry = map.get(identifier);
72 if (entry == null) {
73 final AtomicInteger newEntry = new AtomicInteger();
74 entry = map.putIfAbsent(identifier, newEntry);
75 if (entry == null) {
76 entry = newEntry;
77 }
78 }
79 return entry;
80 }
81
82 }