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core/src/main/java/org/apache/accumulo/core/client/admin/TabletMergeability.java
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| /* | ||
| * 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 | ||
| * | ||
| * https://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 org.apache.accumulo.core.client.admin; | ||
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| import java.io.Serializable; | ||
| import java.time.Duration; | ||
| import java.util.Objects; | ||
| import java.util.Optional; | ||
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| import com.google.common.base.Preconditions; | ||
|
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| /** | ||
| * @since 4.0.0 | ||
| */ | ||
| public class TabletMergeability implements Serializable { | ||
| private static final long serialVersionUID = 1L; | ||
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| private static final TabletMergeability NEVER = new TabletMergeability(); | ||
| private static final TabletMergeability ALWAYS = new TabletMergeability(Duration.ZERO); | ||
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| private final Duration delay; | ||
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| private TabletMergeability(Duration delay) { | ||
| this.delay = Objects.requireNonNull(delay); | ||
| } | ||
|
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| // Edge case for NEVER | ||
| private TabletMergeability() { | ||
| this.delay = null; | ||
| } | ||
|
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| /** | ||
| * Determines if the configured delay signals a tablet is never eligible to be automatically | ||
| * merged. | ||
| * | ||
| * @return true if never mergeable, else false | ||
| */ | ||
| public boolean isNever() { | ||
| return this.delay == null; | ||
| } | ||
|
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| /** | ||
| * Determines if the configured delay signals a tablet is always eligible to be automatically | ||
| * merged now. (Has a delay of 0) | ||
| * | ||
| * @return true if always mergeable now, else false | ||
| */ | ||
| public boolean isAlways() { | ||
| return delay != null && this.delay.isZero(); | ||
| } | ||
|
|
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| /** | ||
| * Returns an Optional duration of the delay which is one of: | ||
| * | ||
| * <ul> | ||
| * <li>empty (never)</li> | ||
| * <li>0 (now)</li> | ||
| * <li>positive delay</li> | ||
| * </ul> | ||
| * | ||
| * @return the configured mergeability delay | ||
| */ | ||
| public Optional<Duration> getDelay() { | ||
| return Optional.ofNullable(delay); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (o == null || getClass() != o.getClass()) { | ||
| return false; | ||
| } | ||
| TabletMergeability that = (TabletMergeability) o; | ||
| return Objects.equals(delay, that.delay); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hashCode(delay); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| if (delay == null) { | ||
| return "TabletMergeability=NEVER"; | ||
| } | ||
| return "TabletMergeability=AFTER:" + delay.toMillis() + "ms"; | ||
| } | ||
|
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| /** | ||
| * Signifies that a tablet is never eligible to be automatically merged. | ||
| * | ||
| * @return a {@link TabletMergeability} with an empty delay signaling never merge | ||
| */ | ||
| public static TabletMergeability never() { | ||
| return NEVER; | ||
| } | ||
|
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| /** | ||
| * Signifies that a tablet is eligible now to be automatically merged | ||
| * | ||
| * @return a {@link TabletMergeability} with a delay of 0 signaling never merge | ||
| */ | ||
| public static TabletMergeability always() { | ||
| return ALWAYS; | ||
| } | ||
|
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| /** | ||
| * Creates a {@link TabletMergeability} that signals a tablet has a delay to a point in the future | ||
| * before it is automatically eligible to be merged. The duration must be positive value. | ||
| * | ||
| * @param delay the duration of the delay | ||
| * | ||
| * @return a {@link TabletMergeability} from the given delay. | ||
| */ | ||
| public static TabletMergeability after(Duration delay) { | ||
| Preconditions.checkArgument(delay.toNanos() >= 0, "Duration of delay must be greater than 0."); | ||
| return new TabletMergeability(delay); | ||
| } | ||
|
|
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| } |
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