Rewrite FilePreferences
This commit is contained in:
Reinhard Pointner
parent
d84f1783e0
commit
0d637a07f7
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@ -1,216 +1,91 @@
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// https://github.com/sonatype/nexus/blob/2f0e154ec565969b4fd8698883ab76a461210f4f/nexus/nexus-test-harness/nexus-it-helper-plugin/src/main/java/org/sonatype/nexus/rt/prefs/FilePreferences.java
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package net.filebot.util.prefs;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Enumeration;
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import java.util.List;
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import java.util.Map;
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import java.util.Properties;
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import java.util.TreeMap;
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import java.util.prefs.AbstractPreferences;
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import java.util.prefs.BackingStoreException;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* Preferences implementation that stores to a user-defined file. See FilePreferencesFactory. Modified by cstamas,
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* switched to SLF4J logging, and exposed preferences file property.
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*
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* Modified to use '/' as path separator and not '.' because it breaks when keys containing '.' are used.
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*
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* @author David Croft (<a href="http://www.davidc.net">www.davidc.net</a>)
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* @version $Id: FilePreferences.java 283 2009-06-18 17:06:58Z david $
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*/
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public class FilePreferences extends AbstractPreferences {
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private static final Logger log = LoggerFactory.getLogger(FilePreferences.class.getName());
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protected PropertyFileBackingStore store;
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private Map<String, String> root;
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public FilePreferences(PropertyFileBackingStore store) {
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super(null, "");
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private Map<String, FilePreferences> children;
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private boolean isRemoved = false;
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public FilePreferences(AbstractPreferences parent, String name) {
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super(parent, name);
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log.debug("Instantiating node {}", name);
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root = new TreeMap<String, String>();
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children = new TreeMap<String, FilePreferences>();
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try {
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sync();
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} catch (BackingStoreException e) {
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log.error("Unable to sync on creation of node " + name, e);
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}
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this.store = store;
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}
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protected FilePreferences(FilePreferences parent, String name) {
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super(parent, name);
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this.store = parent.store;
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}
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protected String getNodeKey() {
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return absolutePath().substring(1);
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}
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@Override
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protected void putSpi(String key, String value) {
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root.put(key, value);
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try {
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flush();
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} catch (BackingStoreException e) {
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log.error("Unable to flush after putting " + key, e);
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}
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store.setValue(getNodeKey(), key, value);
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}
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@Override
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protected String getSpi(String key) {
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return root.get(key);
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return store.getValue(getNodeKey(), key);
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}
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@Override
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protected void removeSpi(String key) {
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root.remove(key);
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try {
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flush();
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} catch (BackingStoreException e) {
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log.error("Unable to flush after removing " + key, e);
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}
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store.removeValue(getNodeKey(), key);
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}
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@Override
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protected void removeNodeSpi() throws BackingStoreException {
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isRemoved = true;
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flush();
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store.removeNode(getNodeKey());
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}
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@Override
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protected String[] keysSpi() throws BackingStoreException {
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return root.keySet().toArray(new String[root.keySet().size()]);
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return store.getKeys(getNodeKey());
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}
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@Override
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protected String[] childrenNamesSpi() throws BackingStoreException {
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return children.keySet().toArray(new String[children.keySet().size()]);
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return store.getChildren(getNodeKey());
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}
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@Override
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protected FilePreferences childSpi(String name) {
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FilePreferences child = children.get(name);
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if (child == null || child.isRemoved()) {
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child = new FilePreferences(this, name);
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children.put(name, child);
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}
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return child;
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return new FilePreferences(this, name);
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}
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@Override
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public void sync() throws BackingStoreException {
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// if the backing store naturally syncs an entire subtree at once, the implementer is encouraged to override sync(), rather than merely overriding syncSpi()
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syncSpi();
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}
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@Override
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protected void syncSpi() throws BackingStoreException {
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if (isRemoved()) {
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return;
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}
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final File file = FilePreferencesFactory.getPreferencesFile();
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if (!file.exists()) {
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return;
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}
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synchronized (file) {
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Properties p = new Properties();
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try {
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p.load(new FileInputStream(file));
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StringBuilder sb = new StringBuilder();
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getPath(sb);
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String path = sb.toString();
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final Enumeration<?> pnen = p.propertyNames();
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while (pnen.hasMoreElements()) {
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String propKey = (String) pnen.nextElement();
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if (propKey.startsWith(path)) {
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String subKey = propKey.substring(path.length());
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// Only load immediate descendants
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if (subKey.indexOf('/') == -1) {
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root.put(subKey, p.getProperty(propKey));
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}
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}
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}
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} catch (IOException e) {
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throw new BackingStoreException(e);
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}
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try {
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store.sync();
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} catch (Exception e) {
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throw new BackingStoreException(e);
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}
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}
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private void getPath(StringBuilder sb) {
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final FilePreferences parent = (FilePreferences) parent();
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if (parent == null) {
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return;
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}
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parent.getPath(sb);
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sb.append(name()).append('/');
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@Override
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public void flush() throws BackingStoreException {
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// if the backing store naturally flushes an entire subtree at once, the implementer is encouraged to override flush(), rather than merely overriding flushSpi()
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flushSpi();
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}
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@Override
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protected void flushSpi() throws BackingStoreException {
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final File file = FilePreferencesFactory.getPreferencesFile();
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synchronized (file) {
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Properties p = new Properties();
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try {
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StringBuilder sb = new StringBuilder();
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getPath(sb);
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String path = sb.toString();
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if (file.exists()) {
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p.load(new FileInputStream(file));
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List<String> toRemove = new ArrayList<String>();
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// Make a list of all direct children of this node to be removed
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final Enumeration<?> pnen = p.propertyNames();
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while (pnen.hasMoreElements()) {
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String propKey = (String) pnen.nextElement();
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if (propKey.startsWith(path)) {
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String subKey = propKey.substring(path.length());
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// Only do immediate descendants
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if (subKey.indexOf('/') == -1) {
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toRemove.add(propKey);
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}
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}
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}
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// Remove them now that the enumeration is done with
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for (String propKey : toRemove) {
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p.remove(propKey);
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}
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}
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// If this node hasn't been removed, add back in any values
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if (!isRemoved) {
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for (String s : root.keySet()) {
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p.setProperty(path + s, root.get(s));
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}
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}
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p.store(new FileOutputStream(file), "FilePreferences");
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} catch (IOException e) {
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throw new BackingStoreException(e);
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}
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try {
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store.flush();
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} catch (Exception e) {
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throw new BackingStoreException(e);
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}
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}
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}
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@ -1,65 +1,51 @@
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// https://github.com/sonatype/nexus/blob/2f0e154ec565969b4fd8698883ab76a461210f4f/nexus/nexus-test-harness/nexus-it-helper-plugin/src/main/java/org/sonatype/nexus/rt/prefs/FilePreferencesFactory.java
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package net.filebot.util.prefs;
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import java.io.File;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import java.util.prefs.BackingStoreException;
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import java.util.prefs.Preferences;
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import java.util.prefs.PreferencesFactory;
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/**
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* PreferencesFactory implementation that stores the preferences in a user-defined file. To use it, set the system
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* property <tt>java.util.prefs.PreferencesFactory</tt> to <tt>net.filebot.util.pref.FilePreferencesFactory</tt>
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* <p/>
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* The file defaults to [user.home]/.fileprefs, but may be overridden with the system property
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* <tt>net.filebot.util.pref.FilePreferencesFactory.file</tt>. Modified by cstamas, switched to SLF4J logging, and
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* exposed preferences file property.
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*
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* @author David Croft (<a href="http://www.davidc.net">www.davidc.net</a>)
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* @version $Id: FilePreferencesFactory.java 282 2009-06-18 17:05:18Z david $
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*/
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public class FilePreferencesFactory implements PreferencesFactory {
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Preferences rootPreferences;
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public static final String SYSTEM_PROPERTY_FILE = "net.filebot.util.prefs.file";
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private final static FilePreferences userRoot = createRootNode(getBackingStoreFile());
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@Override
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public Preferences systemRoot() {
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return userRoot();
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return userRoot;
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}
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@Override
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public Preferences userRoot() {
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if (rootPreferences == null) {
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rootPreferences = new FilePreferences(null, "");
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}
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return rootPreferences;
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return userRoot;
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}
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private static File preferencesFile;
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public static FilePreferences createRootNode(Path backingStoreFile) {
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FilePreferences node = new FilePreferences(new PropertyFileBackingStore(backingStoreFile));
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// restore preferences
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try {
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node.sync();
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} catch (Exception e) {
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Logger.getLogger(FilePreferences.class.getName()).log(Level.WARNING, e, e::toString);
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}
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public static File getPreferencesFile() {
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if (preferencesFile == null) {
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String prefsFile = System.getProperty(SYSTEM_PROPERTY_FILE);
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if (prefsFile == null || prefsFile.length() == 0) {
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prefsFile = System.getProperty("user.home") + File.separator + ".fileprefs";
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// store preferences on exit
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Runtime.getRuntime().addShutdownHook(new Thread(() -> {
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try {
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userRoot.flush();
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} catch (BackingStoreException e) {
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Logger.getLogger(FilePreferences.class.getName()).log(Level.WARNING, e, e::toString);
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}
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}));
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preferencesFile = new File(prefsFile).getAbsoluteFile();
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}
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return preferencesFile;
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return node;
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}
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public static void setPreferencesFile(File file) {
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preferencesFile = file;
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public static Path getBackingStoreFile() {
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return Paths.get(System.getProperty("net.filebot.util.prefs.file", "prefs.properties"));
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}
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}
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@ -0,0 +1,136 @@
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package net.filebot.util.prefs;
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import static java.nio.charset.StandardCharsets.*;
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import java.io.IOException;
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import java.io.StringReader;
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import java.io.StringWriter;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.channels.FileChannel;
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import java.nio.channels.FileLock;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.StandardOpenOption;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Properties;
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public class PropertyFileBackingStore {
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private Path store;
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private Map<String, Map<String, String>> nodes = new HashMap<String, Map<String, String>>();
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public PropertyFileBackingStore(Path store) {
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this.store = store;
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}
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private Map<String, String> newKeyValueMap(String node) {
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return new HashMap<String, String>();
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}
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public synchronized String setValue(String node, String key, String value) {
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return nodes.computeIfAbsent(node, this::newKeyValueMap).put(key, value);
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}
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public synchronized String getValue(String node, String key) {
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Map<String, String> values = nodes.get(node);
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if (values != null) {
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return values.get(key);
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}
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return null;
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}
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public synchronized void removeValue(String node, String key) {
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Map<String, String> values = nodes.get(node);
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if (values != null) {
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values.remove(key);
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}
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}
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public synchronized void removeNode(String node) {
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nodes.remove(node);
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}
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public synchronized String[] getKeys(String node) {
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Map<String, String> values = nodes.get(node);
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if (values != null) {
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return values.keySet().toArray(new String[0]);
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}
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return new String[0];
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}
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public synchronized String[] getChildren(String node) {
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return nodes.keySet().stream().filter(k -> k.length() > node.length() && k.indexOf('/', node.length()) < 0 && k.startsWith(node)).map(k -> k.substring(node.length())).toArray(String[]::new);
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}
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public synchronized Properties toProperties() {
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Properties props = new Properties();
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nodes.forEach((node, values) -> {
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values.forEach((key, value) -> {
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props.put(node + '/' + key, value);
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});
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});
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return props;
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}
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public synchronized void mergeNodes(Map<String, Map<String, String>> n) {
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n.forEach((node, values) -> {
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nodes.merge(node, values, (m1, m2) -> {
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Map<String, String> m = newKeyValueMap(node);
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m.putAll(m1);
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m.putAll(m2);
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return m;
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});
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});
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}
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public void sync() throws IOException {
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if (!Files.exists(store)) {
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return;
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}
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byte[] bytes = Files.readAllBytes(store);
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StringReader buffer = new StringReader(new String(bytes, UTF_8));
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Properties props = new Properties();
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props.load(buffer);
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Map<String, Map<String, String>> n = new HashMap<String, Map<String, String>>();
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props.forEach((k, v) -> {
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String propertyKey = k.toString();
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int s = propertyKey.lastIndexOf('/');
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String node = propertyKey.substring(0, s);
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String key = propertyKey.substring(s + 1);
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n.computeIfAbsent(node, this::newKeyValueMap).put(key, v.toString());
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});
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mergeNodes(n);
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}
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public void flush() throws IOException {
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StringWriter buffer = new StringWriter(1024);
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this.toProperties().store(buffer, null);
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ByteBuffer data = UTF_8.encode(CharBuffer.wrap(buffer.getBuffer()));
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try (FileChannel out = FileChannel.open(store, StandardOpenOption.WRITE, StandardOpenOption.CREATE)) {
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try (FileLock lock = out.lock()) {
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out.write(data);
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out.truncate(out.position());
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}
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}
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}
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@Override
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public synchronized String toString() {
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return nodes.toString();
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}
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}
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