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src/java.base/share/classes/jdk/internal/module/ServicesCatalog.java

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rev 55958 : 8229407: Avoid ConcurrentHashMap resizes during bootstrap
Reviewed-by: alanb


  64         public String providerName() {
  65             return providerName;
  66         }
  67 
  68         @Override
  69         public int hashCode() {
  70             return Objects.hash(module, providerName);
  71         }
  72 
  73         @Override
  74         public boolean equals(Object ob) {
  75             if (!(ob instanceof ServiceProvider))
  76                 return false;
  77             ServiceProvider that = (ServiceProvider)ob;
  78             return Objects.equals(this.module, that.module)
  79                     && Objects.equals(this.providerName, that.providerName);
  80         }
  81     }
  82 
  83     // service name -> list of providers
  84     private final Map<String, List<ServiceProvider>> map = new ConcurrentHashMap<>();
  85 
  86     private ServicesCatalog() { }
  87 
  88     /**
  89      * Creates a ServicesCatalog that supports concurrent registration
  90      * and lookup
  91      */
  92     public static ServicesCatalog create() {
  93         return new ServicesCatalog();
  94     }
  95 
  96     /**
  97      * Returns the list of service provides for the given service type
  98      * name, creating it if needed.
  99      */
 100     private List<ServiceProvider> providers(String service) {
 101         // avoid computeIfAbsent here
 102         List<ServiceProvider> list = map.get(service);
 103         if (list == null) {
 104             list = new CopyOnWriteArrayList<>();




  64         public String providerName() {
  65             return providerName;
  66         }
  67 
  68         @Override
  69         public int hashCode() {
  70             return Objects.hash(module, providerName);
  71         }
  72 
  73         @Override
  74         public boolean equals(Object ob) {
  75             if (!(ob instanceof ServiceProvider))
  76                 return false;
  77             ServiceProvider that = (ServiceProvider)ob;
  78             return Objects.equals(this.module, that.module)
  79                     && Objects.equals(this.providerName, that.providerName);
  80         }
  81     }
  82 
  83     // service name -> list of providers
  84     private final Map<String, List<ServiceProvider>> map = new ConcurrentHashMap<>(32);
  85 
  86     private ServicesCatalog() { }
  87 
  88     /**
  89      * Creates a ServicesCatalog that supports concurrent registration
  90      * and lookup
  91      */
  92     public static ServicesCatalog create() {
  93         return new ServicesCatalog();
  94     }
  95 
  96     /**
  97      * Returns the list of service provides for the given service type
  98      * name, creating it if needed.
  99      */
 100     private List<ServiceProvider> providers(String service) {
 101         // avoid computeIfAbsent here
 102         List<ServiceProvider> list = map.get(service);
 103         if (list == null) {
 104             list = new CopyOnWriteArrayList<>();


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