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[hotfix][coordination] Introduce the interface StateHandleStore and m…
…ake ZooKeeperStateHandleStore as an implementation
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92 changes: 92 additions & 0 deletions
92
flink-runtime/src/main/java/org/apache/flink/runtime/persistence/IntegerResourceVersion.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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 org.apache.flink.runtime.persistence; | ||
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| import org.apache.flink.util.Preconditions; | ||
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| import javax.annotation.Nonnull; | ||
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| /** | ||
| * {@link ResourceVersion} implementation with {@link Integer} value. The resource version in | ||
| * ZooKeeper is {@link Integer}. | ||
| */ | ||
| public class IntegerResourceVersion implements ResourceVersion<IntegerResourceVersion> { | ||
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| private static final long serialVersionUID = 1L; | ||
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| private static final IntegerResourceVersion NOT_EXISTING = new IntegerResourceVersion(-1); | ||
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| private final int value; | ||
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| private IntegerResourceVersion(int value) { | ||
| this.value = value; | ||
| } | ||
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| @Override | ||
| public int compareTo(@Nonnull IntegerResourceVersion other) { | ||
| return Integer.compare(value, other.getValue()); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object obj) { | ||
| if (obj == this) { | ||
| return true; | ||
| } else if (obj != null && obj.getClass() == IntegerResourceVersion.class) { | ||
| final IntegerResourceVersion that = (IntegerResourceVersion) obj; | ||
| return this.value == that.getValue(); | ||
| } else { | ||
| return false; | ||
| } | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Integer.hashCode(value); | ||
| } | ||
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| @Override | ||
| public boolean isExisting() { | ||
| return this != NOT_EXISTING; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return "IntegerResourceVersion{" + "value='" + value + '\'' + '}'; | ||
| } | ||
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| public int getValue() { | ||
| return this.value; | ||
| } | ||
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| public static IntegerResourceVersion notExisting() { | ||
| return NOT_EXISTING; | ||
| } | ||
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| /** | ||
| * Create a {@link IntegerResourceVersion} with given integer value. | ||
| * | ||
| * @param value resource version integer value. The value should not be negative. | ||
| * | ||
| * @return {@link IntegerResourceVersion} with given value. | ||
| */ | ||
| public static IntegerResourceVersion valueOf(int value) { | ||
| Preconditions.checkArgument(value >= 0); | ||
| return new IntegerResourceVersion(value); | ||
| } | ||
| } |
38 changes: 38 additions & 0 deletions
38
flink-runtime/src/main/java/org/apache/flink/runtime/persistence/ResourceVersion.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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 org.apache.flink.runtime.persistence; | ||
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| import java.io.Serializable; | ||
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| /** | ||
| * Resource version for specific state handle on the underlying storage. The implementation also needs to implement the | ||
| * {@link Comparable} interface so that we could compare the resource versions. | ||
| * | ||
| * @param <R> Type of {@link ResourceVersion} | ||
| */ | ||
| public interface ResourceVersion<R> extends Comparable<R>, Serializable { | ||
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| /** | ||
| * Check whether the state handle is existing. | ||
| * | ||
| * @return true if state handle exists with current {@link ResourceVersion} on external storage. Or false | ||
| * it does not exist. | ||
| */ | ||
| boolean isExisting(); | ||
| } |
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