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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jrt.slobrok.api;
import java.util.Arrays;
import java.util.concurrent.ThreadLocalRandom;
import java.util.logging.Logger;
public class SlobrokList {
private static final Logger log = Logger.getLogger(SlobrokList.class.getName());
private final Internal internal;
private String[] slobroks;
private int idx = 0;
public SlobrokList() {
this.internal = new Internal();
}
public SlobrokList(SlobrokList sibling) {
this.internal = sibling.internal;
}
private void checkUpdate() {
synchronized (internal) {
if (slobroks == internal.slobroks) {
return;
}
slobroks = internal.slobroks;
log.fine(() -> "checkUpdate() updated tmp list="+Arrays.toString(slobroks)+" from shared list="+Arrays.toString(internal.slobroks));
idx = 0;
}
}
public String nextSlobrokSpec() {
checkUpdate();
if (idx < slobroks.length) {
log.fine(() -> "nextSlobrokSpec() returns: "+slobroks[idx]);
return slobroks[idx++];
}
log.fine(() -> "nextSlobrokSpec() reached end of internal list, idx="+idx+"/"+slobroks.length+", tmp list="+Arrays.toString(slobroks)+", shared list="+Arrays.toString(internal.slobroks));
idx = 0;
return null;
}
public void setup(String[] slobroks) {
internal.setup(slobroks);
}
public int length() {
return internal.length();
}
public boolean contains(String slobrok) {
checkUpdate();
for (String s : slobroks) {
if (s.equals(slobrok)) return true;
}
return false;
}
@Override
public String toString() {
return internal.toString();
}
private static class Internal {
String[] slobroks = new String[0];
void setup(String[] slobroks) {
String[] next = new String[slobroks.length];
for (int i = 0; i < slobroks.length; i++) {
next[i] = slobroks[i];
}
for (int i = 0; i + 1 < next.length; i++) {
int lim = next.length - i;
int x = ThreadLocalRandom.current().nextInt(lim);
if (x != 0) {
String tmp = next[i];
next[i] = next[i+x];
next[i+x] = tmp;
}
}
synchronized (this) {
this.slobroks = next;
}
}
synchronized int length() {
return slobroks.length;
}
@Override
public synchronized String toString() {
return Arrays.toString(slobroks);
}
}
}
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