io.sphere.internal.ChaosMode Maven / Gradle / Ivy
package io.sphere.internal;
import com.google.common.collect.ImmutableList;
import java.util.List;
import java.util.Random;
import static io.sphere.internal.util.ListUtil.*;
import javax.annotation.concurrent.Immutable;
/** Chaos! */
public class ChaosMode {
private static int chaosLevel;
public static final int minLevel = 0;
public static final int maxLevel = 5;
private static final int errorChance = 25;
/** True if chaos is enabled at all. */
public static boolean isEnabled() { return getChaosLevel() > 0; }
/** True if now is time for some random expected errors, such as backend errors. */
public static boolean isChaos() { return isEnabled() && isChaosTime(); }
/** True if now is the time for some strange unexpected errors, like random exceptions etc. */
public static boolean isUnexpectedChaos() { return chaosLevel == maxLevel && isChaosTime(); }
/** The level. */
public static synchronized int getChaosLevel() { return chaosLevel; }
/** Sets the level. */
public static synchronized void setChaosLevel(int value) {
ChaosMode.chaosLevel = Math.min(Math.max(value, minLevel), maxLevel);
}
private static final ThreadLocal random = new ThreadLocal() {
@Override protected Random initialValue() {
return new Random();
}
};
private static boolean isChaosTime() {
return random.get().nextInt(100) < errorChance;
}
// ---------------------------------
// Simulate backend HTTP responses
// ---------------------------------
private static HttpResponse resp(int status) {
return new HttpResponse(status, "Chaos: " + status);
}
@SuppressWarnings("unchecked")
private static List> responses = list(
list(resp(404)), // level 1
list(resp(404), resp(409)), // level 2
list(resp(404), resp(409), resp(400)), // level 3
list(resp(404), resp(409), resp(400), resp(500))); // level 4
/** Returns a new chaos response. */
public static HttpResponse chaosHttpResponse() {
if (chaosLevel < 0 || chaosLevel >= responses.size()) return resp(404);
return randomElement(responses.get(chaosLevel - 1));
}
@Immutable
public static class HttpResponse {
private final int status;
private final String body;
public HttpResponse(int status, String body) {
this.status = status;
this.body = body;
}
public int getStatus() { return status; }
public String getBody() { return body; }
}
}