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Make Comparators Serializable

Browse Source 
Motivation:

Objects of java.util.TreeMap or java.util.TreeSet will become
non-Serializable if instantiated with Comparators, which are not also
 Serializable. This can result in unexpected and difficult-to-diagnose
 bugs.

Modifications:

Implements Serializable for all classes, which implements Comparator.

Result:

Proper Comparators which will not force collections to
non-Serializable mode.
This commit is contained in:
Idel Pivnitskiy 2017-10-14 07:28:54 -07:00 committed by Norman Maurer
parent 50a067a8f7
commit 4793daa589
2 changed files with 11 additions and 3 deletions
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9
codec-http2/src/main/java/io/netty/handler/codec/http2/WeightedFairQueueByteDistributor.java
View File

@ -25,6 +25,7 @@ import io.netty.util.internal.PriorityQueueNode;
import io.netty.util.internal.SystemPropertyUtil;
import io.netty.util.internal.UnstableApi;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Iterator;
@ -399,7 +400,9 @@ public final class WeightedFairQueueByteDistributor implements StreamByteDistrib
* <li>Stream ID (higher stream ID is higher priority - used for tie breaker)</li>
* </ul>
*/
private static final class StateOnlyComparator implements Comparator<State> {
private static final class StateOnlyComparator implements Comparator<State>, Serializable {
private static final long serialVersionUID = -4806936913002105966L;
static final StateOnlyComparator INSTANCE = new StateOnlyComparator();
private StateOnlyComparator() {
@ -426,7 +429,9 @@ public final class WeightedFairQueueByteDistributor implements StreamByteDistrib
}
}
private static final class StatePseudoTimeComparator implements Comparator<State> {
private static final class StatePseudoTimeComparator implements Comparator<State>, Serializable {
private static final long serialVersionUID = -1437548640227161828L;
static final StatePseudoTimeComparator INSTANCE = new StatePseudoTimeComparator();
private StatePseudoTimeComparator() {

5
common/src/test/java/io/netty/util/internal/DefaultPriorityQueueTest.java
View File

@ -17,6 +17,7 @@ package io.netty.util.internal;
import org.junit.Test;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
@ -245,7 +246,9 @@ public class DefaultPriorityQueueTest {
assertTrue(queue.isEmpty());
}
private static final class TestElementComparator implements Comparator<TestElement> {
private static final class TestElementComparator implements Comparator<TestElement>, Serializable {
private static final long serialVersionUID = 7930368853384760103L;
static final TestElementComparator INSTANCE = new TestElementComparator();
private TestElementComparator() {