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ServiceRegistry.java
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/**
* Jooby https://jooby.io
* Apache License Version 2.0 https://jooby.io/LICENSE.txt
* Copyright 2014 Edgar Espina
*/
package io.jooby;
import io.jooby.exception.RegistryException;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.inject.Provider;
import java.util.Map;
import java.util.Set;
/**
* Default registry which use a simply key/value mechanism for storing and retrieving services.
*
* @author edgar
* @since 2.0.0
*/
public interface ServiceRegistry extends Registry {
/**
* Registered service keys.
*
* @return Service keys.
*/
@Nonnull Set<ServiceKey<?>> keySet();
/**
* Registered service entries.
*
* @return Service entries.
*/
@Nonnull Set<Map.Entry<ServiceKey<?>, Provider<?>>> entrySet();
/**
* Retrieve a service/resource by key.
*
* @param key Service/resource key.
* @param <T> Service/resource type.
* @return Service.
* @throws RegistryException If there was a runtime failure while providing an instance.
*/
default @Nonnull <T> T get(@Nonnull ServiceKey<T> key) {
T service = getOrNull(key);
if (service == null) {
throw new RegistryException("Service not found: " + key);
}
return service;
}
/**
* Retrieve a service/resource by key.
*
* @param type Service/resource key.
* @param <T> Service/resource type.
* @return Service.
* @throws RegistryException If there was a runtime failure while providing an instance.
*/
default @Nonnull <T> T get(@Nonnull Class<T> type) {
return get(ServiceKey.key(type));
}
/**
* Retrieve an existing service or <code>null</code> if not exists.
*
* @param key Service/resource key.
* @param <T> Service/resource type.
* @return Service or <code>null</code>.
*/
@Nullable <T> T getOrNull(@Nonnull ServiceKey<T> key);
/**
* Retrieve an existing service or <code>null</code> if not exists.
*
* @param type Service/resource key.
* @param <T> Service/resource type.
* @return Service or <code>null</code>.
*/
default @Nullable <T> T getOrNull(@Nonnull Class<T> type) {
return getOrNull(ServiceKey.key(type));
}
/**
* Put a service in this registry. This method overrides any previous registered service.
*
* @param type Service/resource key.
* @param service Service instance.
* @param <T> Service type.
* @return Previously registered service or <code>null</code>.
*/
default @Nullable <T> T put(@Nonnull Class<T> type, Provider<T> service) {
return put(ServiceKey.key(type), service);
}
/**
* Put a service in this registry. This method overrides any previous registered service.
*
* @param key Service/resource key.
* @param service Service instance.
* @param <T> Service type.
* @return Previously registered service or <code>null</code>.
*/
@Nullable <T> T put(@Nonnull ServiceKey<T> key, Provider<T> service);
/**
* Put a service in this registry. This method overrides any previous registered service.
*
* @param type Service/resource key.
* @param service Service instance.
* @param <T> Service type.
* @return Previously registered service or <code>null</code>.
*/
default @Nullable <T> T put(@Nonnull Class<T> type, T service) {
return put(ServiceKey.key(type), service);
}
/**
* Put a service in this registry. This method overrides any previous registered service.
*
* @param key Service/resource key.
* @param service Service instance.
* @param <T> Service type.
* @return Previously registered service or <code>null</code>.
*/
@Nullable <T> T put(@Nonnull ServiceKey<T> key, T service);
/**
* Put/register a service in this registry if there isn't the same service already registered.
*
*
* @param key Service/resource key.
* @param service Service instance.
* @param <T> Service type.
* @return Previously registered service or <code>null</code>.
*/
@Nullable <T> T putIfAbsent(@Nonnull ServiceKey<T> key, T service);
/**
* Put/register a service in this registry if there isn't the same service already registered.
*
*
* @param type Service/resource key.
* @param service Service instance.
* @param <T> Service type.
* @return Previously registered service or <code>null</code>.
*/
default @Nullable <T> T putIfAbsent(@Nonnull Class<T> type, T service) {
return putIfAbsent(ServiceKey.key(type), service);
}
/**
* Put/register a service in this registry if there isn't the same service already registered.
*
*
* @param key Service/resource key.
* @param service Service instance.
* @param <T> Service type.
* @return Previously registered service or <code>null</code>.
*/
@Nullable <T> T putIfAbsent(@Nonnull ServiceKey<T> key, Provider<T> service);
/**
* Put/register a service in this registry if there isn't the same service already registered.
*
*
* @param type Service/resource key.
* @param service Service instance.
* @param <T> Service type.
* @return Previously registered service or <code>null</code>.
*/
default @Nullable <T> T putIfAbsent(@Nonnull Class<T> type, Provider<T> service) {
return putIfAbsent(ServiceKey.key(type), service);
}
default @Nonnull @Override <T> T require(@Nonnull Class<T> type) {
return get(ServiceKey.key(type));
}
default @Nonnull @Override <T> T require(@Nonnull Class<T> type, @Nonnull String name) {
return get(ServiceKey.key(type, name));
}
default @Nonnull @Override <T> T require(@Nonnull ServiceKey<T> key) throws RegistryException {
return get(key);
}
}