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WaitForConditionWatcher.java
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WaitForConditionWatcher.java
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/**
* Copyright (C) 2015 Red Hat, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.fabric8.kubernetes.client.dsl.base;
import java.net.HttpURLConnection;
import java.util.concurrent.CompletableFuture;
import java.util.function.Predicate;
import io.fabric8.kubernetes.api.model.HasMetadata;
import io.fabric8.kubernetes.client.KubernetesClientException;
import io.fabric8.kubernetes.client.Watcher;
public class WaitForConditionWatcher<T extends HasMetadata> implements Watcher<T> {
private final Predicate<T> condition;
private final CompletableFuture<T> future;
public WaitForConditionWatcher(Predicate<T> condition) {
this.condition = condition;
this.future = new CompletableFuture<>();
}
public CompletableFuture<T> getFuture() {
return future;
}
@Override
public void eventReceived(Action action, T resource) {
switch (action) {
case ADDED:
case MODIFIED:
if (condition.test(resource)) {
future.complete(resource);
}
break;
case DELETED:
if (condition.test(null)) {
future.complete(null);
}
break;
case ERROR:
future.completeExceptionally(new WatchException("Action.ERROR received"));
break;
}
}
@Override
public void onClose(KubernetesClientException cause) {
future.completeExceptionally(new WatchException("Watcher closed", cause));
}
public static class WatchException extends Exception {
public WatchException(String message, KubernetesClientException cause) {
super(message, cause);
}
public WatchException(String message) {
super(message);
}
public boolean isShouldRetry() {
return getCause() == null || !isHttpGone();
}
private boolean isHttpGone() {
KubernetesClientException cause = ((KubernetesClientException) getCause());
return cause.getCode() == HttpURLConnection.HTTP_GONE
|| (cause.getStatus() != null && cause.getStatus().getCode() == HttpURLConnection.HTTP_GONE);
}
}
}