message APIResourceDiscovery {
  // resource is the plural name of the resource.  This is used in the URL path and is the unique identifier
  // for this resource across all versions in the API group.
  // Resources with non-empty groups are located at /apis/<APIGroupDiscovery.objectMeta.name>/<APIVersionDiscovery.version>/<APIResourceDiscovery.Resource>

  // Group is the API Group of the Resource.  "*" means all.
  // +optional
  optional string group = 3;

  // Version is the API Version of the Resource.  "*" means all.
  // +optional
  optional string version = 4;

  // Resource is one of the existing resource types.  "*" means all.
  // +optional
  optional string resource = 5;

  // Subresource is one of the existing resource types.  "" means none.
  // +optional

    URL resource = getClass().getResource("testdata/i18n.txt");
    assertThat(Resources.toByteArray(resource)).isEqualTo(I18N.getBytes(UTF_8));
  }

  public void testReadLines() throws IOException {
    // TODO(chrisn): Check in a better resource
    URL resource = getClass().getResource("testdata/i18n.txt");
    assertEquals(ImmutableList.of(I18N), Resources.readLines(resource, UTF_8));
  }

    URL resource = getClass().getResource("testdata/i18n.txt");
    assertThat(Resources.toByteArray(resource)).isEqualTo(I18N.getBytes(UTF_8));
  }

  public void testReadLines() throws IOException {
    // TODO(chrisn): Check in a better resource
    URL resource = getClass().getResource("testdata/i18n.txt");
    assertEquals(ImmutableList.of(I18N), Resources.readLines(resource, UTF_8));
  }

  private final ImmutableSet<ResourceInfo> resources;

  private ClassPath(ImmutableSet<ResourceInfo> resources) {
    this.resources = resources;
  }

  /**
   * Returns a {@code ClassPath} representing all classes and resources loadable from {@code
   * classloader} and its ancestor class loaders.
   *
   * <p><b>Warning:</b> {@code ClassPath} can find classes and resources only from:
   *
   * <ul>

    public static final String RESOURCE = "META-INF/maven/slf4j-configuration.properties";

    public static Slf4jConfiguration getConfiguration(ILoggerFactory loggerFactory) {
        String slf4jBinding = loggerFactory.getClass().getCanonicalName();

        try {
            Enumeration<URL> resources =
                    Slf4jConfigurationFactory.class.getClassLoader().getResources(RESOURCE);

  </dependencies>
  <build>
    <resources>
      <resource>
        <directory>..</directory>
        <includes>
          <include>LICENSE</include> <!-- copied from the parent pom because I couldn't figure out a way to make combine.children="append" work -->
          <include>proguard/*</include>
        </includes>
        <targetPath>META-INF</targetPath>
      </resource>
    </resources>
    <plugins>
      <plugin>

Istio reads from over 20 different resources types, and aggregates them together to build the proxy configuration. These resources can be sourced from Kubernetes (via watches), files, or over xDS; Kubernetes is by far the most common usage, though.

Primarily for historical reasons, ingestion is split into a few components.

#### ConfigStore

// resources supported in a specific group and version, and if the resource
// is namespaced.
message APIResourceList {
  // groupVersion is the group and version this APIResourceList is for.
  optional string groupVersion = 1;

  // resources contains the name of the resources and if they are namespaced.
  repeated APIResource resources = 2;
}

                    .build());
        }
    }

    private <T> List<T> map(List<T> resources, Function<T, T> mapper) {
        List<T> newResources = null;
        if (resources != null) {
            for (int i = 0; i < resources.size(); i++) {
                T resource = resources.get(i);
                T newResource = mapper.apply(resource);
                if (newResource != null) {
                    if (newResources == null) {