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Auth Manager API part 3: OAuth2 Manager
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core/src/main/java/org/apache/iceberg/rest/auth/AuthSessionCache.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 | ||
| * | ||
| * 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 org.apache.iceberg.rest.auth; | ||
|
|
||
| import com.github.benmanes.caffeine.cache.Cache; | ||
| import com.github.benmanes.caffeine.cache.Caffeine; | ||
| import java.time.Duration; | ||
| import java.util.concurrent.Executor; | ||
| import java.util.concurrent.ForkJoinPool; | ||
| import java.util.function.Function; | ||
| import java.util.function.LongSupplier; | ||
| import javax.annotation.Nullable; | ||
| import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; | ||
|
|
||
| /** A cache for {@link AuthSession} instances. */ | ||
| public class AuthSessionCache implements AutoCloseable { | ||
|
|
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| private final Duration sessionTimeout; | ||
| private final Executor executor; | ||
| private final LongSupplier nanoTimeSupplier; | ||
|
|
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| private volatile Cache<String, AuthSession> sessionCache; | ||
|
|
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| /** | ||
| * Creates a new cache with the given session timeout, and with default executor and nano time | ||
| * supplier for eviction tasks. | ||
| * | ||
| * @param sessionTimeout the session timeout. Sessions will become eligible for eviction after | ||
| * this duration of inactivity. | ||
| */ | ||
| public AuthSessionCache(Duration sessionTimeout) { | ||
| this(sessionTimeout, null, null); | ||
| } | ||
|
|
||
| /** | ||
| * Creates a new cache with the given session timeout, executor, and nano time supplier. This | ||
| * method is useful for testing mostly. | ||
| * | ||
| * @param sessionTimeout the session timeout. Sessions will become eligible for eviction after | ||
| * this duration of inactivity. | ||
| * @param executor the executor to use for eviction tasks; if null, the cache will use the | ||
| * {@linkplain ForkJoinPool#commonPool() common pool}. The executor will not be closed when | ||
| * this cache is closed. | ||
| * @param nanoTimeSupplier the supplier for nano time; if null, the cache will use {@link | ||
| * System#nanoTime()}. | ||
| */ | ||
| public AuthSessionCache( | ||
| Duration sessionTimeout, | ||
| @Nullable Executor executor, | ||
| @Nullable LongSupplier nanoTimeSupplier) { | ||
| this.sessionTimeout = sessionTimeout; | ||
| this.executor = executor; | ||
| this.nanoTimeSupplier = nanoTimeSupplier; | ||
| } | ||
|
|
||
| /** | ||
| * Returns a cached session for the given key, loading it with the given loader if it is not | ||
| * already cached. | ||
| * | ||
| * @param key the key to use for the session. | ||
| * @param loader the loader to use to load the session if it is not already cached. | ||
| * @param <T> the type of the session. | ||
| * @return the cached session. | ||
| */ | ||
| @SuppressWarnings("unchecked") | ||
| public <T extends AuthSession> T cachedSession(String key, Function<String, T> loader) { | ||
| return (T) sessionCache().get(key, loader); | ||
| } | ||
|
|
||
| @Override | ||
| public void close() { | ||
| Cache<String, AuthSession> cache = sessionCache; | ||
| this.sessionCache = null; | ||
| if (cache != null) { | ||
| cache.invalidateAll(); | ||
| cache.cleanUp(); | ||
| } | ||
| } | ||
|
|
||
| @VisibleForTesting | ||
| Cache<String, AuthSession> sessionCache() { | ||
| if (sessionCache == null) { | ||
| synchronized (this) { | ||
| if (sessionCache == null) { | ||
| this.sessionCache = newSessionCache(sessionTimeout, executor, nanoTimeSupplier); | ||
| } | ||
| } | ||
| } | ||
| return sessionCache; | ||
| } | ||
|
|
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| private static Cache<String, AuthSession> newSessionCache( | ||
| Duration sessionTimeout, Executor executor, LongSupplier nanoTimeSupplier) { | ||
| Caffeine<String, AuthSession> builder = | ||
| Caffeine.newBuilder() | ||
| .expireAfterAccess(sessionTimeout) | ||
| .removalListener( | ||
| (id, auth, cause) -> { | ||
| if (auth != null) { | ||
| auth.close(); | ||
| } | ||
| }); | ||
| if (executor != null) { | ||
| builder.executor(executor); | ||
| } | ||
| if (nanoTimeSupplier != null) { | ||
| builder.ticker(nanoTimeSupplier::getAsLong); | ||
| } | ||
| return builder.build(); | ||
| } | ||
| } |
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