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Moved ZooCache management into ZooSession
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53 changes: 53 additions & 0 deletions
53
core/src/main/java/org/apache/accumulo/core/zookeeper/ZcStat.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| /* | ||
| * 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.zookeeper; | ||
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| import org.apache.zookeeper.data.Stat; | ||
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| import com.google.common.annotations.VisibleForTesting; | ||
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| public class ZcStat { | ||
| private long ephemeralOwner; | ||
| private long mzxid; | ||
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| public ZcStat() {} | ||
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| public ZcStat(Stat stat) { | ||
| this.ephemeralOwner = stat.getEphemeralOwner(); | ||
| this.mzxid = stat.getMzxid(); | ||
| } | ||
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| public long getEphemeralOwner() { | ||
| return ephemeralOwner; | ||
| } | ||
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| public void set(ZcStat cachedStat) { | ||
| this.ephemeralOwner = cachedStat.ephemeralOwner; | ||
| this.mzxid = cachedStat.mzxid; | ||
| } | ||
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| @VisibleForTesting | ||
| public void setEphemeralOwner(long ephemeralOwner) { | ||
| this.ephemeralOwner = ephemeralOwner; | ||
| } | ||
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| public long getMzxid() { | ||
| return mzxid; | ||
| } | ||
| } |
107 changes: 107 additions & 0 deletions
107
core/src/main/java/org/apache/accumulo/core/zookeeper/ZooCache.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| /* | ||
| * 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.zookeeper; | ||
|
|
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| import java.util.List; | ||
| import java.util.Optional; | ||
| import java.util.function.Consumer; | ||
| import java.util.function.Predicate; | ||
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| import org.apache.accumulo.core.lock.ServiceLockData; | ||
| import org.apache.accumulo.core.lock.ServiceLockPaths.ServiceLockPath; | ||
| import org.apache.zookeeper.WatchedEvent; | ||
|
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| public interface ZooCache { | ||
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| interface ZooCacheWatcher extends Consumer<WatchedEvent> {} | ||
|
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| /** | ||
| * Add a ZooCacheWatcher object to this ZooCache | ||
| * | ||
| * @param watcher | ||
| */ | ||
| void addZooCacheWatcher(ZooCacheWatcher watcher); | ||
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| /** | ||
| * Gets the children of the given node. A watch is established by this call. | ||
| * | ||
| * @param zPath path of node | ||
| * @return children list, or null if node has no children or does not exist | ||
| */ | ||
| List<String> getChildren(String zPath); | ||
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| /** | ||
| * Gets data at the given path. Status information is not returned. A watch is established by this | ||
| * call. | ||
| * | ||
| * @param zPath path to get | ||
| * @return path data, or null if non-existent | ||
| */ | ||
| byte[] get(String zPath); | ||
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| /** | ||
| * Gets data at the given path, filling status information into the given <code>Stat</code> | ||
| * object. A watch is established by this call. | ||
| * | ||
| * @param zPath path to get | ||
| * @param status status object to populate | ||
| * @return path data, or null if non-existent | ||
| */ | ||
| byte[] get(String zPath, ZcStat status); | ||
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| /** | ||
| * Returns a monotonically increasing count of the number of time the cache was updated. If the | ||
| * count is the same, then it means cache did not change. | ||
| */ | ||
| long getUpdateCount(); | ||
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| /** | ||
| * Checks if a data value (or lack of one) is cached. | ||
| * | ||
| * @param zPath path of node | ||
| * @return true if data value is cached | ||
| */ | ||
| boolean dataCached(String zPath); | ||
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| /** | ||
| * Checks if children of a node (or lack of them) are cached. | ||
| * | ||
| * @param zPath path of node | ||
| * @return true if children are cached | ||
| */ | ||
| boolean childrenCached(String zPath); | ||
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| /** | ||
| * Removes all paths in the cache match the predicate. | ||
| */ | ||
| void clear(Predicate<String> pathPredicate); | ||
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| /** | ||
| * Clears this cache of all information about nodes rooted at the given path. | ||
| * | ||
| * @param zPath path of top node | ||
| */ | ||
| void clear(String zPath); | ||
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| /** | ||
| * Gets the lock data from the node in the cache at the specified path | ||
| */ | ||
| Optional<ServiceLockData> getLockData(ServiceLockPath path); | ||
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| } |
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