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fix fabric8io#4638 creating a common base for resource locks
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96 changes: 96 additions & 0 deletions
96
.../java/io/fabric8/kubernetes/client/extended/leaderelection/resourcelock/ResourceLock.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| /** | ||
| * 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. | ||
| */ | ||
|
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| package io.fabric8.kubernetes.client.extended.leaderelection.resourcelock; | ||
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| import io.fabric8.kubernetes.api.model.HasMetadata; | ||
| import io.fabric8.kubernetes.api.model.ObjectMeta; | ||
| import io.fabric8.kubernetes.api.model.ObjectMetaBuilder; | ||
| import io.fabric8.kubernetes.client.KubernetesClient; | ||
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| import java.util.Objects; | ||
| import java.util.Optional; | ||
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| public abstract class ResourceLock<T extends HasMetadata> implements Lock { | ||
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| private final String namespace; | ||
| private final String name; | ||
| private final String identity; | ||
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| public ResourceLock(String namespace, String name, String identity) { | ||
| this.namespace = Objects.requireNonNull(namespace, "namespace is required"); | ||
| this.name = Objects.requireNonNull(name, "name is required"); | ||
| this.identity = Objects.requireNonNull(identity, "identity is required"); | ||
| } | ||
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| protected abstract Class<T> getKind(); | ||
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| @Override | ||
| public LeaderElectionRecord get(KubernetesClient client) { | ||
| return getResource(client).map(this::toRecord).orElse(null); | ||
| } | ||
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| private Optional<T> getResource(KubernetesClient client) { | ||
| return Optional.ofNullable(client.resources(getKind()).inNamespace(namespace).withName(name).get()); | ||
| } | ||
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| @Override | ||
| public void create(KubernetesClient client, LeaderElectionRecord leaderElectionRecord) { | ||
| client.resource(toResource(leaderElectionRecord, getObjectMeta(null), null)).create(); | ||
| } | ||
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| @Override | ||
| public void update(KubernetesClient client, LeaderElectionRecord leaderElectionRecord) { | ||
| // this should be an edit, but we've disabled the ability for it to have optimistic locking | ||
| client.resource(getResource(client).map(r -> toResource(leaderElectionRecord, getObjectMeta(r), r)) | ||
| .orElseThrow(() -> new NullPointerException())).lockResourceVersion().replace(); | ||
| } | ||
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| /** | ||
| * Convert the record to a resource | ||
| * | ||
| * @param leaderElectionRecord | ||
| * @param meta not null | ||
| * @param current may be null | ||
| * @return | ||
| */ | ||
| protected abstract T toResource(LeaderElectionRecord leaderElectionRecord, ObjectMeta meta, T current); | ||
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| protected abstract LeaderElectionRecord toRecord(T resource); | ||
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| protected ObjectMeta getObjectMeta(T current) { | ||
| ObjectMetaBuilder builder = Optional.ofNullable(current).map(HasMetadata::getMetadata).map(ObjectMetaBuilder::new) | ||
| .orElse(new ObjectMetaBuilder()); | ||
| return builder.withNamespace(namespace).withName(name).build(); | ||
| } | ||
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| /** | ||
| * {@inheritDoc} | ||
| */ | ||
| @Override | ||
| public String identity() { | ||
| return identity; | ||
| } | ||
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| /** | ||
| * {@inheritDoc} | ||
| */ | ||
| @Override | ||
| public String describe() { | ||
| return String.format("%sLock: %s - %s (%s)", getKind().getSimpleName(), namespace, name, identity); | ||
| } | ||
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| } |
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