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CustomResourceInformerExample.java
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CustomResourceInformerExample.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.examples;
import io.fabric8.kubernetes.api.model.HasMetadata;
import io.fabric8.kubernetes.api.model.ObjectMeta;
import io.fabric8.kubernetes.client.KubernetesClient;
import io.fabric8.kubernetes.client.KubernetesClientBuilder;
import io.fabric8.kubernetes.client.informers.ResourceEventHandler;
import io.fabric8.kubernetes.client.informers.SharedIndexInformer;
import io.fabric8.kubernetes.client.informers.SharedInformerFactory;
import io.fabric8.kubernetes.examples.crds.Dummy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
public class CustomResourceInformerExample {
private static final Logger logger = LoggerFactory.getLogger(CustomResourceInformerExample.class);
public static void main(String[] args) {
try (KubernetesClient client = new KubernetesClientBuilder().build()) {
SharedInformerFactory sharedInformerFactory = client.informers();
SharedIndexInformer<Dummy> podInformer = sharedInformerFactory.sharedIndexInformerFor(Dummy.class, 60 * 1000L);
logger.info("Informer factory initialized.");
podInformer.addEventHandler(
new ResourceEventHandler<Dummy>() {
@Override
public void onAdd(Dummy pod) {
logger.info("{} dummy added", pod.getMetadata().getName());
}
@Override
public void onUpdate(Dummy oldPod, Dummy newPod) {
logger.info("{} dummy updated", oldPod.getMetadata().getName());
}
@Override
public void onDelete(Dummy pod, boolean deletedFinalStateUnknown) {
logger.info("{} dummy deleted", pod.getMetadata().getName());
}
});
podInformer.stopped().whenComplete((v, t) -> {
if (t != null) {
logger.error("Exception occurred, caught: {}", t.getMessage());
}
});
logger.info("Starting all registered informers");
sharedInformerFactory.startAllRegisteredInformers();
Executors.newSingleThreadExecutor().submit(() -> {
Thread.currentThread().setName("HAS_SYNCED_THREAD");
try {
for (;;) {
logger.info("podInformer.hasSynced() : {}", podInformer.hasSynced());
Thread.sleep(10 * 1000L);
}
} catch (InterruptedException inEx) {
Thread.currentThread().interrupt();
logger.warn("HAS_SYNCED_THREAD interrupted: {}", inEx.getMessage());
}
});
final Dummy toCreate = new Dummy();
toCreate.getMetadata().setName("dummy");
if (client.getConfiguration().getNamespace() != null) {
toCreate.getMetadata().setNamespace(client.getConfiguration().getNamespace());
} else if (client.getNamespace() != null) {
toCreate.getMetadata().setNamespace(client.getNamespace());
} else {
toCreate.getMetadata().setNamespace(client.namespaces().list().getItems().stream().findFirst()
.map(HasMetadata::getMetadata).map(ObjectMeta::getNamespace).orElse("default"));
}
client.resources(Dummy.class).createOrReplace(toCreate);
// Wait for some time now
TimeUnit.MINUTES.sleep(5);
} catch (InterruptedException interruptedException) {
Thread.currentThread().interrupt();
logger.warn("interrupted: {}", interruptedException.getMessage());
}
}
}