spring-retry MapRetryContextCache 源码
spring-retry MapRetryContextCache 代码
文件路径：/src/main/java/org/springframework/retry/policy/MapRetryContextCache.java
/*
* Copyright 2006-2022 the original author or authors.
*
* 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
*
* 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.springframework.retry.policy;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.springframework.retry.RetryContext;
/**
* Map-based implementation of {@link RetryContextCache}. The map backing the cache of
* contexts is synchronized.
*
* @author Dave Syer
*/
public class MapRetryContextCache implements RetryContextCache {
/**
* Default value for maximum capacity of the cache. This is set to a reasonably low
* value (4096) to avoid users inadvertently filling the cache with item keys that are
* inconsistent.
*/
public static final int DEFAULT_CAPACITY = 4096;
private final Map<Object, RetryContext> map = Collections.synchronizedMap(new HashMap<>());
private int capacity;
/**
* Create a {@link MapRetryContextCache} with default capacity.
*/
public MapRetryContextCache() {
this(DEFAULT_CAPACITY);
}
/**
* @param defaultCapacity the default capacity
*/
public MapRetryContextCache(int defaultCapacity) {
super();
this.capacity = defaultCapacity;
}
/**
* Public setter for the capacity. Prevents the cache from growing unboundedly if
* items that fail are misidentified and two references to an identical item actually
* do not have the same key. This can happen when users implement equals and hashCode
* based on mutable fields, for instance.
* @param capacity the capacity to set
*/
public void setCapacity(int capacity) {
this.capacity = capacity;
}
public boolean containsKey(Object key) {
return map.containsKey(key);
}
public RetryContext get(Object key) {
return map.get(key);
}
public void put(Object key, RetryContext context) {
if (map.size() >= capacity) {
throw new RetryCacheCapacityExceededException("Retry cache capacity limit breached. "
+ "Do you need to re-consider the implementation of the key generator, "
+ "or the equals and hashCode of the items that failed?");
}
map.put(key, context);
}
public void remove(Object key) {
map.remove(key);
}
}
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