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Add a way to configure
DeserializerCache Jackson uses (#4101)
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135 changes: 129 additions & 6 deletions
135
src/main/java/com/fasterxml/jackson/databind/cfg/DefaultCacheProvider.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,19 +1,142 @@ | ||
| package com.fasterxml.jackson.databind.cfg; | ||
|
|
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| import com.fasterxml.jackson.databind.DeserializationConfig; | ||
| import com.fasterxml.jackson.databind.JavaType; | ||
| import com.fasterxml.jackson.databind.JsonDeserializer; | ||
| import com.fasterxml.jackson.databind.deser.DeserializerCache; | ||
| import com.fasterxml.jackson.databind.util.LRUMap; | ||
| import com.fasterxml.jackson.databind.util.LookupCache; | ||
|
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| /** | ||
| * Default implementation of {@link CacheProvider}. | ||
| * | ||
| * The default implementation of {@link CacheProvider}. | ||
| * Configuration is builder-based via {@link DefaultCacheProvider.Builder}. | ||
| * <p> | ||
| * Users can either use this class or create their own {@link CacheProvider} implementation. | ||
| * | ||
| * @since 2.16 | ||
| */ | ||
| public class DefaultCacheProvider | ||
| implements CacheProvider | ||
| { | ||
| private static final long serialVersionUID = 1L; | ||
|
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| public static DefaultCacheProvider defaultInstance() { | ||
| return new DefaultCacheProvider(); | ||
| } | ||
| private final static DefaultCacheProvider DEFAULT | ||
| = new DefaultCacheProvider(DeserializerCache.DEFAULT_MAX_CACHE_SIZE); | ||
|
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| /** | ||
| * Maximum size of the {@link LookupCache} instance constructed by {@link #forDeserializerCache(DeserializationConfig)}. | ||
| * | ||
| * @see Builder#maxDeserializerCacheSize(int) | ||
| */ | ||
| protected final int _maxDeserializerCacheSize; | ||
|
|
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| // To implement! | ||
| /* | ||
| /********************************************************************** | ||
| /* Life cycle | ||
| /********************************************************************** | ||
| */ | ||
|
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| protected DefaultCacheProvider(int deserializerCache) | ||
| { | ||
| _maxDeserializerCacheSize = deserializerCache; | ||
| } | ||
|
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| /* | ||
| /********************************************************************** | ||
| /* Defaults | ||
| /********************************************************************** | ||
| */ | ||
|
|
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| /** | ||
| * @return Default {@link DefaultCacheProvider} instance using default configuration values. | ||
| */ | ||
| public static CacheProvider defaultInstance() { | ||
| return DEFAULT; | ||
| } | ||
|
|
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| /* | ||
| /********************************************************** | ||
| /* API implementation | ||
| /********************************************************** | ||
| */ | ||
|
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| /** | ||
| * Method to provide a {@link LookupCache} instance for constructing {@link DeserializerCache}. | ||
| * Implementation should match {@link DeserializerCache#DeserializerCache(int)}. | ||
| * | ||
| * @return {@link LookupCache} instance for constructing {@link DeserializerCache}. | ||
| */ | ||
| @Override | ||
| public LookupCache<JavaType, JsonDeserializer<Object>> forDeserializerCache(DeserializationConfig config) { | ||
| return _buildCache(_maxDeserializerCacheSize); | ||
| } | ||
|
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| /* | ||
| /********************************************************** | ||
| /* Overridable factory methods | ||
| /********************************************************** | ||
| */ | ||
|
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| protected <K,V> LookupCache<K,V> _buildCache(int maxSize) | ||
| { | ||
| // Use 1/4 of maximum size (but at most 64) for initial size | ||
| final int initialSize = Math.min(64, maxSize >> 2); | ||
| return new LRUMap<>(initialSize, maxSize); | ||
| } | ||
|
|
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| /* | ||
| /********************************************************** | ||
| /* Builder Config | ||
| /********************************************************** | ||
| */ | ||
|
|
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| /** | ||
| * @return {@link Builder} instance for configuration. | ||
| */ | ||
| public static DefaultCacheProvider.Builder builder() { | ||
| return new Builder(); | ||
| } | ||
|
|
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| /** | ||
| * Builder offering fluent factory methods to configure {@link DefaultCacheProvider}, keeping it immutable. | ||
| */ | ||
| public static class Builder { | ||
|
|
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| /** | ||
| * Maximum Size of the {@link LookupCache} instance created by {@link #forDeserializerCache(DeserializationConfig)}. | ||
| * Corresponds to {@link DefaultCacheProvider#_maxDeserializerCacheSize}. | ||
| */ | ||
| private int _maxDeserializerCacheSize; | ||
|
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| Builder() { } | ||
|
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| /** | ||
| * Define the maximum size of the {@link LookupCache} instance constructed by {@link #forDeserializerCache(DeserializationConfig)}. | ||
| * The cache is instantiated as: | ||
| * <pre> | ||
| * return new LRUMap<>(Math.min(64, maxSize >> 2), maxSize); | ||
| * </pre> | ||
| * | ||
| * @param maxDeserializerCacheSize Size for the {@link LookupCache} to use within {@link DeserializerCache} | ||
| * @return this builder | ||
| * @throws IllegalArgumentException if {@code maxDeserializerCacheSize} is negative | ||
| * @since 2.16 | ||
| */ | ||
| public Builder maxDeserializerCacheSize(int maxDeserializerCacheSize) { | ||
| if (maxDeserializerCacheSize < 0) { | ||
| throw new IllegalArgumentException("Cannot set maxDeserializerCacheSize to a negative value"); | ||
| } | ||
| _maxDeserializerCacheSize = maxDeserializerCacheSize; | ||
| return this; | ||
| } | ||
|
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| /** | ||
| * Constructs a {@link DefaultCacheProvider} with the provided configuration values, using defaults where not specified. | ||
| * | ||
| * @return A {@link DefaultCacheProvider} instance with the specified configuration | ||
| */ | ||
| public DefaultCacheProvider build() { | ||
| return new DefaultCacheProvider(_maxDeserializerCacheSize); | ||
| } | ||
| } | ||
| } |
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