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feat(perf): adapt policy for new classloader system (#6)
Closes gravitee-io/issues#6758
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106 changes: 106 additions & 0 deletions
106
src/main/java/io/gravitee/policy/metricsreporter/freemarker/CustomTemplateLoader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| /** | ||
| * Copyright (C) 2015 The Gravitee team (http://gravitee.io) | ||
| * | ||
| * 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 io.gravitee.policy.metricsreporter.freemarker; | ||
|
|
||
| import com.google.common.cache.Cache; | ||
| import com.google.common.cache.CacheBuilder; | ||
| import freemarker.cache.TemplateLoader; | ||
| import java.io.Reader; | ||
| import java.io.StringReader; | ||
| import java.time.Duration; | ||
| import java.util.Objects; | ||
|
|
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| // Duplicated class for now, see https://github.com/gravitee-io/issues/issues/6857 | ||
| public class CustomTemplateLoader implements TemplateLoader { | ||
|
|
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| /** | ||
| * Number of hours to keep script in cache after the last time it was accessed. | ||
| */ | ||
| private static final int CACHE_EXPIRATION_HOURS = 1; | ||
|
|
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| /** | ||
| * Max number of entries in the cache. | ||
| */ | ||
| private static final int CACHE_MAXIMUM_SIZE = 1000; | ||
|
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| private final Cache<Object, Object> templates = CacheBuilder | ||
| .newBuilder() | ||
| .maximumSize(CACHE_MAXIMUM_SIZE) | ||
| .expireAfterAccess(Duration.ofHours(CACHE_EXPIRATION_HOURS)) | ||
| .build(); | ||
|
|
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| Cache<Object, Object> getCache() { | ||
| return templates; | ||
| } | ||
|
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| @Override | ||
| public void closeTemplateSource(Object templateSource) {} | ||
|
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| @Override | ||
| public Object findTemplateSource(String name) { | ||
| return templates.getIfPresent(name); | ||
| } | ||
|
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| @Override | ||
| public long getLastModified(Object templateSource) { | ||
| return ((TemplateSource) templateSource).lastModified; | ||
| } | ||
|
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| @Override | ||
| public Reader getReader(Object templateSource, String encoding) { | ||
| return new StringReader(((TemplateSource) templateSource).templateContent); | ||
| } | ||
|
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| public void putIfAbsent(String name, String templateSource) { | ||
| if (templates.getIfPresent(name) == null) { | ||
| templates.put( | ||
| name, | ||
| new TemplateSource(name, templateSource, System.currentTimeMillis()) | ||
| ); | ||
| } | ||
| } | ||
|
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| private static class TemplateSource { | ||
|
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| private final String name; | ||
| private final String templateContent; | ||
| private final long lastModified; | ||
|
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| TemplateSource(String name, String templateContent, long lastModified) { | ||
| this.name = name; | ||
| this.templateContent = templateContent; | ||
| this.lastModified = lastModified; | ||
| } | ||
|
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) return true; | ||
| if (o == null || getClass() != o.getClass()) return false; | ||
| TemplateSource that = (TemplateSource) o; | ||
| return Objects.equals(name, that.name); | ||
| } | ||
|
|
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(name); | ||
| } | ||
|
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| @Override | ||
| public String toString() { | ||
| return name; | ||
| } | ||
| } | ||
| } |