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Merge pull request #102 from cryptomator/feature/common-quick-access-…
…base Refactoring Common quick access base
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106 changes: 106 additions & 0 deletions
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src/main/java/org/cryptomator/linux/quickaccess/FileConfiguredQuickAccess.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| package org.cryptomator.linux.quickaccess; | ||
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| import org.cryptomator.integrations.quickaccess.QuickAccessService; | ||
| import org.cryptomator.integrations.quickaccess.QuickAccessServiceException; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import java.io.IOException; | ||
| import java.nio.charset.StandardCharsets; | ||
| import java.nio.file.AtomicMoveNotSupportedException; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
| import java.nio.file.StandardCopyOption; | ||
| import java.nio.file.StandardOpenOption; | ||
| import java.util.concurrent.locks.Lock; | ||
| import java.util.concurrent.locks.ReentrantReadWriteLock; | ||
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| abstract class FileConfiguredQuickAccess implements QuickAccessService { | ||
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| private static final Logger LOG = LoggerFactory.getLogger(FileConfiguredQuickAccess.class); | ||
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| private final int maxFileSize; | ||
| private final Path configFile; | ||
| private final Path tmpFile; | ||
| private final Lock modifyLock = new ReentrantReadWriteLock().writeLock(); | ||
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| FileConfiguredQuickAccess(Path configFile, int maxFileSize) { | ||
| this.configFile = configFile; | ||
| this.maxFileSize = maxFileSize; | ||
| this.tmpFile = configFile.resolveSibling("." + configFile.getFileName() + ".cryptomator.tmp"); | ||
| Runtime.getRuntime().addShutdownHook(new Thread(this::cleanup)); | ||
| } | ||
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| @Override | ||
| public QuickAccessEntry add(Path target, String displayName) throws QuickAccessServiceException { | ||
| try { | ||
| modifyLock.lock(); | ||
| var entryAndConfig = addEntryToConfig(readConfig(), target, displayName); | ||
| persistConfig(entryAndConfig.config()); | ||
| return entryAndConfig.entry(); | ||
| } catch (IOException e) { | ||
| throw new QuickAccessServiceException("Failed to add entry to %s.".formatted(configFile), e); | ||
| } finally { | ||
| modifyLock.unlock(); | ||
| } | ||
| } | ||
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| record EntryAndConfig(FileConfiguredQuickAccessEntry entry, String config) { | ||
| } | ||
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| abstract EntryAndConfig addEntryToConfig(String config, Path target, String displayName) throws QuickAccessServiceException; | ||
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| protected abstract class FileConfiguredQuickAccessEntry implements QuickAccessEntry { | ||
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| private volatile boolean isRemoved = false; | ||
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| @Override | ||
| public void remove() throws QuickAccessServiceException { | ||
| try { | ||
| modifyLock.lock(); | ||
| if (isRemoved) { | ||
| return; | ||
| } | ||
| checkFileSize(); | ||
| var config = readConfig(); | ||
| var adjustedConfig = removeEntryFromConfig(config); | ||
| persistConfig(adjustedConfig); | ||
| isRemoved = true; | ||
| } catch (IOException e) { | ||
| throw new QuickAccessServiceException("Failed to remove entry to %s.".formatted(configFile), e); | ||
| } finally { | ||
| modifyLock.unlock(); | ||
| } | ||
| } | ||
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| abstract String removeEntryFromConfig(String config) throws QuickAccessServiceException; | ||
| } | ||
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| private String readConfig() throws IOException { | ||
| return Files.readString(configFile, StandardCharsets.UTF_8); | ||
| } | ||
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| private void persistConfig(String newConfig) throws IOException { | ||
| Files.writeString(tmpFile, newConfig, StandardOpenOption.WRITE, StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING); | ||
| try { | ||
| Files.move(tmpFile, configFile, StandardCopyOption.REPLACE_EXISTING, StandardCopyOption.ATOMIC_MOVE); | ||
| } catch (AtomicMoveNotSupportedException e) { | ||
| Files.move(tmpFile, configFile, StandardCopyOption.REPLACE_EXISTING); | ||
| } | ||
| } | ||
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| private void checkFileSize() throws IOException { | ||
| if (Files.size(configFile) > maxFileSize) { | ||
| throw new IOException("File %s exceeds size of %d bytes".formatted(configFile, maxFileSize)); | ||
| } | ||
| } | ||
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| private void cleanup() { | ||
| try { | ||
| Files.deleteIfExists(tmpFile); | ||
| } catch (IOException e) { | ||
| LOG.warn("Unable to delete {}. Need to be deleted manually.", tmpFile); | ||
| } | ||
| } | ||
| } |
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