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Camunda 7 Keycloak Identity Provider Plugin for Camunda Platform 7 Run
/*
* Copyright 2015 Ben Manes. All Rights Reserved.
*
* 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.
*/
package com.github.benmanes.caffeine.cache;
import static com.github.benmanes.caffeine.cache.Caffeine.calculateHashMapCapacity;
import static com.github.benmanes.caffeine.cache.LocalAsyncCache.composeResult;
import static java.util.Objects.requireNonNull;
import java.lang.System.Logger;
import java.lang.System.Logger.Level;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CancellationException;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionException;
import java.util.concurrent.TimeoutException;
import java.util.function.Function;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* This class provides a skeletal implementation of the {@link LoadingCache} interface to minimize
* the effort required to implement a {@link LocalCache}.
*
* @author [email protected] (Ben Manes)
*/
interface LocalLoadingCache extends LocalManualCache, LoadingCache {
Logger logger = System.getLogger(LocalLoadingCache.class.getName());
/** Returns the {@link AsyncCacheLoader} used by this cache. */
AsyncCacheLoader cacheLoader();
/** Returns the {@link CacheLoader#load} as a mapping function. */
Function mappingFunction();
/** Returns the {@link CacheLoader#loadAll} as a mapping function, if implemented. */
@Nullable Function, Map> bulkMappingFunction();
@Override
@SuppressWarnings("NullAway")
default V get(K key) {
return cache().computeIfAbsent(key, mappingFunction());
}
@Override
default Map getAll(Iterable keys) {
Function, Map> mappingFunction = bulkMappingFunction();
return (mappingFunction == null)
? loadSequentially(keys)
: getAll(keys, mappingFunction);
}
/** Sequentially loads each missing entry. */
default Map loadSequentially(Iterable keys) {
var result = new LinkedHashMap(calculateHashMapCapacity(keys));
for (K key : keys) {
result.put(key, null);
}
int count = 0;
try {
for (var iter = result.entrySet().iterator(); iter.hasNext();) {
Map.Entry entry = iter.next();
count++;
V value = get(entry.getKey());
if (value == null) {
iter.remove();
} else {
entry.setValue(value);
}
}
} catch (Throwable t) {
cache().statsCounter().recordMisses(result.size() - count);
throw t;
}
return Collections.unmodifiableMap(result);
}
@Override
@SuppressWarnings("FutureReturnValueIgnored")
default CompletableFuture refresh(K key) {
requireNonNull(key);
long[] startTime = new long[1];
@SuppressWarnings("unchecked")
V[] oldValue = (V[]) new Object[1];
@SuppressWarnings({"rawtypes", "unchecked"})
CompletableFuture[] reloading = new CompletableFuture[1];
Object keyReference = cache().referenceKey(key);
var future = cache().refreshes().compute(keyReference, (k, existing) -> {
if ((existing != null) && !Async.isReady(existing) && !cache().isPendingEviction(key)) {
return existing;
}
try {
startTime[0] = cache().statsTicker().read();
oldValue[0] = cache().getIfPresentQuietly(key);
var refreshFuture = (oldValue[0] == null)
? cacheLoader().asyncLoad(key, cache().executor())
: cacheLoader().asyncReload(key, oldValue[0], cache().executor());
reloading[0] = requireNonNull(refreshFuture, "Null future");
return refreshFuture;
} catch (RuntimeException e) {
throw e;
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new CompletionException(e);
} catch (Exception e) {
throw new CompletionException(e);
}
});
if (reloading[0] != null) {
reloading[0].whenComplete((newValue, error) -> {
long loadTime = cache().statsTicker().read() - startTime[0];
if (error != null) {
if (!(error instanceof CancellationException) && !(error instanceof TimeoutException)) {
logger.log(Level.WARNING, "Exception thrown during refresh", error);
}
cache().refreshes().remove(keyReference, reloading[0]);
cache().statsCounter().recordLoadFailure(loadTime);
return;
}
boolean[] discard = new boolean[1];
var value = cache().compute(key, (k, currentValue) -> {
boolean removed = cache().refreshes().remove(keyReference, reloading[0]);
if (removed && (currentValue == oldValue[0])) {
return (currentValue == null) && (newValue == null) ? null : newValue;
}
discard[0] = (currentValue != newValue);
return currentValue;
}, cache().expiry(), /* recordLoad */ false, /* recordLoadFailure */ true);
if (discard[0] && (newValue != null)) {
var cause = (value == null) ? RemovalCause.EXPLICIT : RemovalCause.REPLACED;
cache().notifyRemoval(key, newValue, cause);
}
if (newValue == null) {
cache().statsCounter().recordLoadFailure(loadTime);
} else {
cache().statsCounter().recordLoadSuccess(loadTime);
}
});
}
@SuppressWarnings("unchecked")
CompletableFuture castedFuture = (CompletableFuture) future;
return castedFuture;
}
@Override
default CompletableFuture> refreshAll(Iterable keys) {
var result = new LinkedHashMap>(calculateHashMapCapacity(keys));
for (K key : keys) {
result.computeIfAbsent(key, this::refresh);
}
return composeResult(result);
}
/** Returns a mapping function that adapts to {@link CacheLoader#load}. */
static Function newMappingFunction(CacheLoader cacheLoader) {
return key -> {
try {
return cacheLoader.load(key);
} catch (RuntimeException e) {
throw e;
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new CompletionException(e);
} catch (Exception e) {
throw new CompletionException(e);
}
};
}
/** Returns a mapping function that adapts to {@link CacheLoader#loadAll}, if implemented. */
static @Nullable Function, Map> newBulkMappingFunction(
CacheLoader cacheLoader) {
if (!hasLoadAll(cacheLoader)) {
return null;
}
return keysToLoad -> {
try {
@SuppressWarnings("unchecked")
Map loaded = (Map) cacheLoader.loadAll(keysToLoad);
return loaded;
} catch (RuntimeException e) {
throw e;
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new CompletionException(e);
} catch (Exception e) {
throw new CompletionException(e);
}
};
}
/** Returns whether the supplied cache loader has bulk load functionality. */
static boolean hasLoadAll(CacheLoader loader) {
try {
Method classLoadAll = loader.getClass().getMethod("loadAll", Set.class);
Method defaultLoadAll = CacheLoader.class.getMethod("loadAll", Set.class);
return !classLoadAll.equals(defaultLoadAll);
} catch (NoSuchMethodException | SecurityException e) {
logger.log(Level.WARNING, "Cannot determine if CacheLoader can bulk load", e);
return false;
}
}
}
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