* Class that detects {@link Sone} modifications (as per their {@link
* Sone#getFingerprint() fingerprints} and determines when a modified Sone may
* be inserted.
- *
- * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
*/
class SoneModificationDetector {
private final Ticker ticker;
private final LockableFingerprintProvider lockableFingerprintProvider;
private final AtomicInteger insertionDelay;
- private Optional<Long> lastModificationTime;
- private String originalFingerprint;
- private String lastFingerprint;
+ private Long lastModificationTime;
+ private String lastInsertFingerprint;
+ private String lastCheckFingerprint;
SoneModificationDetector(LockableFingerprintProvider lockableFingerprintProvider, AtomicInteger insertionDelay) {
this(systemTicker(), lockableFingerprintProvider, insertionDelay);
this.ticker = ticker;
this.lockableFingerprintProvider = lockableFingerprintProvider;
this.insertionDelay = insertionDelay;
- lastFingerprint = originalFingerprint;
+ lastCheckFingerprint = lastInsertFingerprint;
}
public boolean isEligibleForInsert() {
if (lockableFingerprintProvider.isLocked()) {
- lastModificationTime = absent();
- lastFingerprint = "";
+ lastModificationTime = null;
+ lastCheckFingerprint = "";
return false;
}
String fingerprint = lockableFingerprintProvider.getFingerprint();
- if (originalFingerprint.equals(fingerprint)) {
- lastModificationTime = absent();
- lastFingerprint = fingerprint;
+ if (fingerprint.equals(lastInsertFingerprint)) {
+ lastModificationTime = null;
+ lastCheckFingerprint = fingerprint;
return false;
}
- if (!lastFingerprint.equals(fingerprint)) {
- lastModificationTime = of(ticker.read());
- lastFingerprint = fingerprint;
+ if (!Objects.equal(lastCheckFingerprint, fingerprint)) {
+ lastModificationTime = ticker.read();
+ lastCheckFingerprint = fingerprint;
return false;
}
return insertionDelayHasPassed();
}
- public String getOriginalFingerprint() {
- return originalFingerprint;
+ public String getLastInsertFingerprint() {
+ return lastInsertFingerprint;
}
public void setFingerprint(String fingerprint) {
- originalFingerprint = fingerprint;
- lastFingerprint = originalFingerprint;
- lastModificationTime = absent();
+ lastInsertFingerprint = fingerprint;
+ lastCheckFingerprint = lastInsertFingerprint;
+ lastModificationTime = null;
}
private boolean insertionDelayHasPassed() {
- return NANOSECONDS.toSeconds(ticker.read() - lastModificationTime.get()) >= insertionDelay.get();
+ return NANOSECONDS.toSeconds(ticker.read() - lastModificationTime) >= insertionDelay.get();
}
public boolean isModified() {
- return !Objects.equal(lockableFingerprintProvider.getFingerprint(), originalFingerprint);
+ return !Objects.equal(lockableFingerprintProvider.getFingerprint(), lastInsertFingerprint);
}
/**
* Provider for a fingerprint and the information if a {@link Sone} is locked. This
* prevents us from having to lug a Sone object around.
- *
- * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
*/
static interface LockableFingerprintProvider {