package com.cloudbees.api;
import com.cloudbees.api.oauth.OauthToken;
import javax.annotation.CheckForNull;
import javax.annotation.Nullable;
import java.util.concurrent.TimeUnit;
/**
* Cached {@link OauthToken} with accurate expiration tracking.
*
* @author Kohsuke Kawaguchi
*/
final class CachedToken {
/**
* Null if the token was invalid to begin with.
*/
private final @Nullable OauthToken token;
private final long expiration;
private final long halfExpiration;
CachedToken(OauthToken token) {
this.token = token;
if (token!=null) {
long now = System.currentTimeMillis();
long e = TimeUnit.SECONDS.toMillis(token.getExpiresIn());
expiration = now + e;
halfExpiration = now + e /2;
} else
expiration = halfExpiration = -1;
}
/**
* Returns true if half the life time of the token has elapsed
* since the token was obtained. This really only makes sense
* for caching token generation.
*/
boolean isHalfExpired() {
return halfExpiration < System.currentTimeMillis();
}
public @CheckForNull OauthToken get() {
if (token==null) return null;
OauthToken t = token.clone();
t.setExpiresIn(round(TimeUnit.MICROSECONDS.toSeconds(expiration - System.currentTimeMillis())));
return t;
}
/**
* Converts long to int by rounding values outside the range of int to the max/min values.
*/
private int round(long l) {
if (l>Integer.MAX_VALUE) return Integer.MAX_VALUE;
if (l<Integer.MIN_VALUE) return Integer.MIN_VALUE;
return (int)l;
}
}