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package org.slf4j.helpers;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.HashMap;
import java.util.Map;
/**
* A simple implementation of ThreadLocal backed Map containing values of type
* Deque<String>.
*
* @author Ceki Guuml;cü
* @since 2.0.0
*/
public class ThreadLocalMapOfStacks {
// BEWARE: Keys or values placed in a ThreadLocal should not be of a type/class
// not included in the JDK. See also https://jira.qos.ch/browse/LOGBACK-450
final ThreadLocal<Map<String, Deque<String>>> tlMapOfStacks = new ThreadLocal<>();
public void pushByKey(String key, String value) {
if (key == null)
return;
Map<String, Deque<String>> map = tlMapOfStacks.get();
if (map == null) {
map = new HashMap<>();
tlMapOfStacks.set(map);
}
Deque<String> deque = map.get(key);
if (deque == null) {
deque = new ArrayDeque<>();
}
deque.push(value);
map.put(key, deque);
}
public String popByKey(String key) {
if (key == null)
return null;
Map<String, Deque<String>> map = tlMapOfStacks.get();
if (map == null)
return null;
Deque<String> deque = map.get(key);
if (deque == null)
return null;
return deque.pop();
}
public Deque<String> getCopyOfDequeByKey(String key) {
if (key == null)
return null;
Map<String, Deque<String>> map = tlMapOfStacks.get();
if (map == null)
return null;
Deque<String> deque = map.get(key);
if (deque == null)
return null;
return new ArrayDeque<String>(deque);
}
/**
* Clear the deque(stack) referenced by 'key'.
*
* @param key identifies the stack
*
* @since 2.0.0
*/
public void clearDequeByKey(String key) {
if (key == null)
return;
Map<String, Deque<String>> map = tlMapOfStacks.get();
if (map == null)
return;
Deque<String> deque = map.get(key);
if (deque == null)
return;
deque.clear();
}
}
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