# Istio Agent

This document describes the internal architecture of Istio agent.

## High Level overview

![High Level overview](docs/overview.svg)

At a high level, the Istio agent acts as an intermediate proxy between Istiod and Envoy. This is done
at two levels. For distributing workload certificates, Envoy will send [SDS](https://www.envoyproxy.io/docs/envoy/latest/configuration/security/secret)

   */
  public ImmutableSet<ClassInfo> getAllClasses() {
    return FluentIterable.from(resources).filter(ClassInfo.class).toSet();
  }

  /**
   * Returns all top level classes loadable from the current class path. Note that "top-level-ness"
   * is determined heuristically by class name (see {@link ClassInfo#isTopLevel}).
   */
  public ImmutableSet<ClassInfo> getTopLevelClasses() {
    return FluentIterable.from(resources)

        } catch( IOException ioe ) {
            close();
            throw ioe;
        }

        switch( type ) {
            case SessionServicePacket.POSITIVE_SESSION_RESPONSE:
                if( log.level > 2 )
                    log.println( "session established ok with " + address );
                return;
            case SessionServicePacket.NEGATIVE_SESSION_RESPONSE:

     */
    @Nonnull
    String getMessage();

    /**
     * Gets the severity level of this problem.
     *
     * @return the severity level of this problem, never {@code null}
     */
    @Nonnull
    Severity getSeverity();

    /**
     * The different severity levels for a problem, in decreasing order.
     *
     * @since 4.0.0
     */
    @Experimental
    enum Severity {

   * Returns the ancestor of the current domain at the given number of levels "higher" (rightward)
   * in the subdomain list. The number of levels must be non-negative, and less than {@code N-1},
   * where {@code N} is the number of parts in the domain.
   *
   * <p>TODO: Reasonable candidate for addition to public API.
   */
  private InternetDomainName ancestor(int levels) {

import com.google.j2objc.annotations.ReflectionSupport;
import java.util.Set;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import java.util.logging.Level;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A helper which does some thread-safe operations for aggregate futures, which must be implemented

  @Test
  fun testHttpLoggingInterceptor() {
    val interceptor =
      HttpLoggingInterceptor.androidLogging(tag = "testHttpLoggingInterceptor").apply {
        level = HttpLoggingInterceptor.Level.BASIC
      }

    val client = clientBuilder.addInterceptor(interceptor).build()

    try {
      client.newCall(request).execute()
    } catch (uhe: UnknownHostException) {
      // expected

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package mockwebserver3.junit5.internal

import java.io.IOException
import java.util.logging.Level
import java.util.logging.Logger
import mockwebserver3.MockWebServer
import okhttp3.ExperimentalOkHttpApi
import org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
import org.junit.jupiter.api.extension.AfterAllCallback

			}

			// Print all the messages to stdout in the specified format
			msgs = msgs.SortedDedupedCopy()
			outputMsgs := diag.Messages{}
			for _, m := range msgs {
				if m.Type.Level().IsWorseThanOrEqualTo(outputThreshold.Level) {
					outputMsgs = append(outputMsgs, m)
				}
			}
			output, err := formatting.Print(outputMsgs, msgOutputFormat, true)
			if err != nil {
				return err
			}

example, RAID6 can protect against two drive failure whereas in MinIO erasure code you can lose as many as half of drives and still the data remains safe. Further, MinIO's erasure code is at the object level and can heal one object at a time. For RAID, healing can be done only at the volume level which translates into high downtime. As MinIO encodes each object individually, it can heal objects incrementally. Storage servers once deployed should not require drive replacement or healing for the lifetime...