dlmarion commented on code in PR #35: URL: https://github.com/apache/accumulo-classloaders/pull/35#discussion_r2636349574
########## modules/local-caching-classloader/src/main/java/org/apache/accumulo/classloader/lcc/util/LocalStore.java: ########## @@ -0,0 +1,219 @@ +/* + * 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 + * + * 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.apache.accumulo.classloader.lcc.util; + +import static java.nio.charset.StandardCharsets.UTF_8; +import static java.nio.file.StandardCopyOption.ATOMIC_MOVE; +import static java.nio.file.StandardCopyOption.REPLACE_EXISTING; +import static java.util.Objects.requireNonNull; + +import java.io.File; +import java.io.IOException; +import java.io.InputStream; +import java.io.UncheckedIOException; +import java.net.MalformedURLException; +import java.net.URISyntaxException; +import java.net.URL; +import java.nio.file.FileAlreadyExistsException; +import java.nio.file.Files; +import java.nio.file.Path; +import java.nio.file.StandardOpenOption; +import java.util.LinkedHashSet; +import java.util.Set; +import java.util.concurrent.TimeUnit; +import java.util.regex.Pattern; + +import org.apache.accumulo.classloader.lcc.Constants; +import org.apache.accumulo.classloader.lcc.definition.ContextDefinition; +import org.apache.accumulo.classloader.lcc.definition.Resource; +import org.apache.accumulo.classloader.lcc.resolvers.FileResolver; +import org.apache.accumulo.core.spi.common.ContextClassLoaderFactory.ContextClassLoaderException; +import org.apache.accumulo.core.util.Retry; +import org.apache.accumulo.core.util.Retry.RetryFactory; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public final class LocalStore { + private static final Logger LOG = LoggerFactory.getLogger(LocalStore.class); + private static final String PID = Long.toString(ProcessHandle.current().pid()); + + private final Path contextsDir; + private final Path resourcesDir; + + public LocalStore(final Path baseDir) throws IOException { + this.contextsDir = requireNonNull(baseDir).toAbsolutePath().resolve("contexts"); + this.resourcesDir = baseDir.resolve("resources"); + Files.createDirectories(contextsDir); + Files.createDirectories(resourcesDir); + } + + Path contextsDir() { + return contextsDir; + } + + Path resourcesDir() { + return resourcesDir; + } + + // pattern to match regular files that have at least one non-dot character preceding a dot and a + // non-zero suffix; these files can be easily converted so the local store retains the original + // file name extension, while non-matching files will not attempt to retain the original file name + // extension, and will instead just append the checksum to the original file name + private static Pattern fileNamesWithExtensionPattern = Pattern.compile("^(.*[^.].*)[.]([^.]+)$"); + + static String localName(String remoteFileName, String checksum) { + requireNonNull(remoteFileName); + requireNonNull(checksum); + var matcher = fileNamesWithExtensionPattern.matcher(remoteFileName); + if (matcher.matches()) { + return String.format("%s-%s.%s", matcher.group(1), checksum, matcher.group(2)); + } + return String.format("%s-%s", remoteFileName, checksum); + } + + static String tempName(String baseName) { + return "." + requireNonNull(baseName) + ".tmp_" + PID; + } + + public URLClassLoaderParams storeContextResources(final ContextDefinition contextDefinition) + throws IOException, ContextClassLoaderException, InterruptedException, URISyntaxException { + requireNonNull(contextDefinition, "definition must be supplied"); + final RetryFactory retryFactory = + Retry.builder().infiniteRetries().retryAfter(1, TimeUnit.SECONDS) + .incrementBy(1, TimeUnit.SECONDS).maxWait(5, TimeUnit.MINUTES).backOffFactor(2) + .logInterval(1, TimeUnit.SECONDS).createFactory(); + final String contextName = contextDefinition.getContextName(); + final Set<Path> localFiles = new LinkedHashSet<>(); + try { + storeContextDefinition(contextDefinition); + Retry retry = retryFactory.createRetry(); + boolean successful = false; + while (!successful) { + localFiles.clear(); + for (Resource resource : contextDefinition.getResources()) { + Path path = storeResource(resource); + if (path == null) { + LOG.debug("Skipped resource {} while another process or thread is downloading it", + resource.getLocation()); + continue; + } + localFiles.add(path); + LOG.trace("Added resource {} to classpath", path); + } + successful = localFiles.size() == contextDefinition.getResources().size(); + if (!successful) { + retry.logRetry(LOG, "Unable to store all resources for context " + contextName); + retry.waitForNextAttempt(LOG, "Store resources for context " + contextName); + retry.useRetry(); + } + retry.logCompletion(LOG, + "Resources for context " + contextName + " cached locally as " + localFiles); + } + + } catch (IOException | InterruptedException | RuntimeException e) { + LOG.error("Error initializing context: " + contextDefinition.getContextName(), e); Review Comment: That's likely. -- This is an automated message from the Apache Git Service. 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