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Swim JavaScript language integration

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// Copyright 2015-2024 Nstream, inc.
//
// 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 swim.vm.js;

import org.graalvm.polyglot.Source;
import swim.uri.UriPath;
import swim.util.HashGenCacheMap;

public class JsCachedModuleResolver implements JsModuleResolver {

  final JsModuleResolver moduleResolver;
  final HashGenCacheMap sourceCache;

  public JsCachedModuleResolver(JsModuleResolver moduleResolver) {
    this.moduleResolver = moduleResolver;
    this.sourceCache = JsCachedModuleResolver.createSourceCache();
  }

  public final JsModuleResolver moduleResolver() {
    return this.moduleResolver;
  }

  @Override
  public UriPath resolveModulePath(UriPath basePath, UriPath modulePath) {
    return this.moduleResolver.resolveModulePath(basePath, modulePath);
  }

  @Override
  public Source loadModuleSource(UriPath moduleId) {
    Source moduleSource = this.sourceCache.get(moduleId);
    if (moduleSource == null) {
      moduleSource = this.moduleResolver.loadModuleSource(moduleId);
      this.sourceCache.put(moduleId, moduleSource);
    }
    return moduleSource;
  }

  static HashGenCacheMap createSourceCache() {
    int sourceCacheSize;
    try {
      sourceCacheSize = Integer.parseInt(System.getProperty("swim.vm.js.source.cache.size"));
    } catch (NumberFormatException e) {
      sourceCacheSize = 128;
    }
    return new HashGenCacheMap(sourceCacheSize);
  }

}