java.util.ServiceLoader.loadFromSystemProperty()方法的使用及代码示例

x33g5p2x  于2022-01-29 转载在 其他  
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本文整理了Java中java.util.ServiceLoader.loadFromSystemProperty()方法的一些代码示例，展示了ServiceLoader.loadFromSystemProperty()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ServiceLoader.loadFromSystemProperty()方法的具体详情如下：
包路径：java.util.ServiceLoader
类名称：ServiceLoader
方法名：loadFromSystemProperty

ServiceLoader.loadFromSystemProperty介绍

[英]Internal API to support built-in SPIs that check a system property first. Returns an instance specified by a property with the class' binary name, or null if no such property is set.
[中]支持先检查系统属性的内置SPI的内部API。返回由具有类的二进制名称的属性指定的实例，如果未设置此类属性，则返回null。

代码示例

代码示例来源：origin: robovm/robovm

private static PreferencesFactory findPreferencesFactory() {
  // Try the system property first...
  PreferencesFactory result = ServiceLoader.loadFromSystemProperty(PreferencesFactory.class);
  if (result != null) {
    return result;
  }
  // Then use ServiceLoader for META-INF/services/...
  for (PreferencesFactory impl : ServiceLoader.load(PreferencesFactory.class)) {
    return impl;
  }
  // Finally return a default...
  return new FilePreferencesFactoryImpl();
}

代码示例来源：origin: robovm/robovm

/**
 * Gets a provider instance by executing the following steps when called for
 * the first time:
 * <ul>
 * <li> if the system property "java.nio.channels.spi.SelectorProvider" is
 * set, the value of this property is the class name of the provider
 * returned; </li>
 * <li>if there is a provider-configuration file named
 * "java.nio.channels.spi.SelectorProvider" in META-INF/services of a jar
 * file valid in the system class loader, the first class name is the
 * provider's class name; </li>
 * <li> otherwise, a system default provider will be returned.</li>
 * </ul>
 *
 * @return the provider.
 */
synchronized public static SelectorProvider provider() {
  if (provider == null) {
    provider = ServiceLoader.loadFromSystemProperty(SelectorProvider.class);
    if (provider == null) {
      provider = loadProviderByJar();
    }
    if (provider == null) {
      provider = new SelectorProviderImpl();
    }
  }
  return provider;
}

代码示例来源：origin: com.bugvm/bugvm-rt

private static PreferencesFactory findPreferencesFactory() {
  // Try the system property first...
  PreferencesFactory result = ServiceLoader.loadFromSystemProperty(PreferencesFactory.class);
  if (result != null) {
    return result;
  }
  // Then use ServiceLoader for META-INF/services/...
  for (PreferencesFactory impl : ServiceLoader.load(PreferencesFactory.class)) {
    return impl;
  }
  // Finally return a default...
  return new FilePreferencesFactoryImpl();
}

代码示例来源：origin: MobiVM/robovm

private static PreferencesFactory findPreferencesFactory() {
  // Try the system property first...
  PreferencesFactory result = ServiceLoader.loadFromSystemProperty(PreferencesFactory.class);
  if (result != null) {
    return result;
  }
  // Then use ServiceLoader for META-INF/services/...
  for (PreferencesFactory impl : ServiceLoader.load(PreferencesFactory.class)) {
    return impl;
  }
  // Finally return a default...
  return new FilePreferencesFactoryImpl();
}

代码示例来源：origin: FlexoVM/flexovm

private static PreferencesFactory findPreferencesFactory() {
  // Try the system property first...
  PreferencesFactory result = ServiceLoader.loadFromSystemProperty(PreferencesFactory.class);
  if (result != null) {
    return result;
  }
  // Then use ServiceLoader for META-INF/services/...
  for (PreferencesFactory impl : ServiceLoader.load(PreferencesFactory.class)) {
    return impl;
  }
  // Finally return a default...
  return new FilePreferencesFactoryImpl();
}

代码示例来源：origin: com.gluonhq/robovm-rt

private static PreferencesFactory findPreferencesFactory() {
  // Try the system property first...
  PreferencesFactory result = ServiceLoader.loadFromSystemProperty(PreferencesFactory.class);
  if (result != null) {
    return result;
  }
  // Then use ServiceLoader for META-INF/services/...
  for (PreferencesFactory impl : ServiceLoader.load(PreferencesFactory.class)) {
    return impl;
  }
  // Finally return a default...
  return new FilePreferencesFactoryImpl();
}

代码示例来源：origin: ibinti/bugvm

private static PreferencesFactory findPreferencesFactory() {
  // Try the system property first...
  PreferencesFactory result = ServiceLoader.loadFromSystemProperty(PreferencesFactory.class);
  if (result != null) {
    return result;
  }
  // Then use ServiceLoader for META-INF/services/...
  for (PreferencesFactory impl : ServiceLoader.load(PreferencesFactory.class)) {
    return impl;
  }
  // Finally return a default...
  return new FilePreferencesFactoryImpl();
}

代码示例来源：origin: com.mobidevelop.robovm/robovm-rt

private static PreferencesFactory findPreferencesFactory() {
  // Try the system property first...
  PreferencesFactory result = ServiceLoader.loadFromSystemProperty(PreferencesFactory.class);
  if (result != null) {
    return result;
  }
  // Then use ServiceLoader for META-INF/services/...
  for (PreferencesFactory impl : ServiceLoader.load(PreferencesFactory.class)) {
    return impl;
  }
  // Finally return a default...
  return new FilePreferencesFactoryImpl();
}

代码示例来源：origin: com.bugvm/bugvm-rt

/**
 * Gets a provider instance by executing the following steps when called for
 * the first time:
 * <ul>
 * <li> if the system property "java.nio.channels.spi.SelectorProvider" is
 * set, the value of this property is the class name of the provider
 * returned; </li>
 * <li>if there is a provider-configuration file named
 * "java.nio.channels.spi.SelectorProvider" in META-INF/services of a jar
 * file valid in the system class loader, the first class name is the
 * provider's class name; </li>
 * <li> otherwise, a system default provider will be returned.</li>
 * </ul>
 *
 * @return the provider.
 */
synchronized public static SelectorProvider provider() {
  if (provider == null) {
    provider = ServiceLoader.loadFromSystemProperty(SelectorProvider.class);
    if (provider == null) {
      provider = loadProviderByJar();
    }
    if (provider == null) {
      provider = new SelectorProviderImpl();
    }
  }
  return provider;
}

代码示例来源：origin: MobiVM/robovm

/**
 * Gets a provider instance by executing the following steps when called for
 * the first time:
 * <ul>
 * <li> if the system property "java.nio.channels.spi.SelectorProvider" is
 * set, the value of this property is the class name of the provider
 * returned; </li>
 * <li>if there is a provider-configuration file named
 * "java.nio.channels.spi.SelectorProvider" in META-INF/services of a jar
 * file valid in the system class loader, the first class name is the
 * provider's class name; </li>
 * <li> otherwise, a system default provider will be returned.</li>
 * </ul>
 *
 * @return the provider.
 */
synchronized public static SelectorProvider provider() {
  if (provider == null) {
    provider = ServiceLoader.loadFromSystemProperty(SelectorProvider.class);
    if (provider == null) {
      provider = loadProviderByJar();
    }
    if (provider == null) {
      provider = new SelectorProviderImpl();
    }
  }
  return provider;
}

代码示例来源：origin: com.gluonhq/robovm-rt

/**
 * Gets a provider instance by executing the following steps when called for
 * the first time:
 * <ul>
 * <li> if the system property "java.nio.channels.spi.SelectorProvider" is
 * set, the value of this property is the class name of the provider
 * returned; </li>
 * <li>if there is a provider-configuration file named
 * "java.nio.channels.spi.SelectorProvider" in META-INF/services of a jar
 * file valid in the system class loader, the first class name is the
 * provider's class name; </li>
 * <li> otherwise, a system default provider will be returned.</li>
 * </ul>
 *
 * @return the provider.
 */
synchronized public static SelectorProvider provider() {
  if (provider == null) {
    provider = ServiceLoader.loadFromSystemProperty(SelectorProvider.class);
    if (provider == null) {
      provider = loadProviderByJar();
    }
    if (provider == null) {
      provider = new SelectorProviderImpl();
    }
  }
  return provider;
}

代码示例来源：origin: ibinti/bugvm

/**
 * Gets a provider instance by executing the following steps when called for
 * the first time:
 * <ul>
 * <li> if the system property "java.nio.channels.spi.SelectorProvider" is
 * set, the value of this property is the class name of the provider
 * returned; </li>
 * <li>if there is a provider-configuration file named
 * "java.nio.channels.spi.SelectorProvider" in META-INF/services of a jar
 * file valid in the system class loader, the first class name is the
 * provider's class name; </li>
 * <li> otherwise, a system default provider will be returned.</li>
 * </ul>
 *
 * @return the provider.
 */
synchronized public static SelectorProvider provider() {
  if (provider == null) {
    provider = ServiceLoader.loadFromSystemProperty(SelectorProvider.class);
    if (provider == null) {
      provider = loadProviderByJar();
    }
    if (provider == null) {
      provider = new SelectorProviderImpl();
    }
  }
  return provider;
}

代码示例来源：origin: com.mobidevelop.robovm/robovm-rt

/**
 * Gets a provider instance by executing the following steps when called for
 * the first time:
 * <ul>
 * <li> if the system property "java.nio.channels.spi.SelectorProvider" is
 * set, the value of this property is the class name of the provider
 * returned; </li>
 * <li>if there is a provider-configuration file named
 * "java.nio.channels.spi.SelectorProvider" in META-INF/services of a jar
 * file valid in the system class loader, the first class name is the
 * provider's class name; </li>
 * <li> otherwise, a system default provider will be returned.</li>
 * </ul>
 *
 * @return the provider.
 */
synchronized public static SelectorProvider provider() {
  if (provider == null) {
    provider = ServiceLoader.loadFromSystemProperty(SelectorProvider.class);
    if (provider == null) {
      provider = loadProviderByJar();
    }
    if (provider == null) {
      provider = new SelectorProviderImpl();
    }
  }
  return provider;
}

代码示例来源：origin: FlexoVM/flexovm

/**
 * Gets a provider instance by executing the following steps when called for
 * the first time:
 * <ul>
 * <li> if the system property "java.nio.channels.spi.SelectorProvider" is
 * set, the value of this property is the class name of the provider
 * returned; </li>
 * <li>if there is a provider-configuration file named
 * "java.nio.channels.spi.SelectorProvider" in META-INF/services of a jar
 * file valid in the system class loader, the first class name is the
 * provider's class name; </li>
 * <li> otherwise, a system default provider will be returned.</li>
 * </ul>
 *
 * @return the provider.
 */
synchronized public static SelectorProvider provider() {
  if (provider == null) {
    provider = ServiceLoader.loadFromSystemProperty(SelectorProvider.class);
    if (provider == null) {
      provider = loadProviderByJar();
    }
    if (provider == null) {
      provider = new SelectorProviderImpl();
    }
  }
  return provider;
}

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