| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.drill.exec.compile; |
| |
| import java.io.IOException; |
| import java.net.URL; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.drill.exec.exception.ClassTransformationException; |
| |
| import com.google.common.cache.CacheBuilder; |
| import com.google.common.cache.CacheLoader; |
| import com.google.common.cache.LoadingCache; |
| import com.google.common.io.Resources; |
| |
| class ByteCodeLoader { |
| static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ByteCodeLoader.class); |
| |
| |
| private final LoadingCache<String, byte[]> byteCode = CacheBuilder.newBuilder().maximumSize(10000) |
| .expireAfterWrite(10, TimeUnit.MINUTES).build(new ClassBytesCacheLoader()); |
| |
| private class ClassBytesCacheLoader extends CacheLoader<String, byte[]> { |
| @Override |
| public byte[] load(String path) throws ClassTransformationException, IOException { |
| URL u = this.getClass().getResource(path); |
| if (u == null) { |
| throw new ClassTransformationException(String.format("Unable to find TemplateClass at path %s", path)); |
| } |
| return Resources.toByteArray(u); |
| } |
| }; |
| |
| public byte[] getClassByteCodeFromPath(String path) throws ClassTransformationException, IOException { |
| try { |
| return byteCode.get(path); |
| } catch (ExecutionException e) { |
| Throwable c = e.getCause(); |
| if (c instanceof ClassTransformationException) { |
| throw (ClassTransformationException) c; |
| } |
| if (c instanceof IOException) { |
| throw (IOException) c; |
| } |
| throw new ClassTransformationException(c); |
| } |
| } |
| |
| } |