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Prevent memory leak in CallbackEvent

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This commit is contained in:
topjohnwu 2017-07-21 05:18:24 +08:00
parent 72820b162c
commit 73bb0b10ee
1 changed files with 15 additions and 7 deletions
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22
app/src/main/java/com/topjohnwu/magisk/utils/CallbackEvent.java
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@ -1,19 +1,23 @@
package com.topjohnwu.magisk.utils; package com.topjohnwu.magisk.utils;
import java.lang.ref.WeakReference;
import java.util.HashSet; import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Set; import java.util.Set;
public class CallbackEvent<Result> { public class CallbackEvent<Result> {
public boolean isTriggered = false; public boolean isTriggered = false;
private Result result; private Result result;
private Set<Listener<Result>> listeners; private List<WeakReference<Listener<Result>>> listeners;
public void register(Listener<Result> l) { public void register(Listener<Result> l) {
if (listeners == null) { if (listeners == null) {
listeners = new HashSet<>(); listeners = new LinkedList<>();
} }
listeners.add(l); listeners.add(new WeakReference<>(l));
} }
public void unRegister() { public void unRegister() {
@ -21,8 +25,11 @@ public class CallbackEvent<Result> {
} }
public void unRegister(Listener<Result> l) { public void unRegister(Listener<Result> l) {
if (listeners != null) { for (Iterator<WeakReference<Listener<Result>>> i = listeners.iterator(); i.hasNext();) {
listeners.remove(l); WeakReference<Listener<Result>> listener = i.next();
if (listener.get() == null || listener.get() == l) {
i.remove();
}
} }
} }
@ -34,8 +41,9 @@ public class CallbackEvent<Result> {
result = r; result = r;
isTriggered = true; isTriggered = true;
if (listeners != null) { if (listeners != null) {
for (Listener<Result> listener : listeners) { for (WeakReference<Listener<Result>> listener : listeners) {
listener.onTrigger(this); if (listener.get() != null)
listener.get().onTrigger(this);
} }
} }
} }