/*******************************************************************************
* Copyright (c) 2013-2015 Sierra Wireless and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v1.0 which accompany this distribution.
*
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.html.
*
* Contributors:
* Sierra Wireless - initial API and implementation
* Achim Kraus (Bosch Software Innovations GmbH) - add json as storage format
*******************************************************************************/
package org.eclipse.leshan.server.bootstrap.demo;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.eclipse.leshan.server.bootstrap.BootstrapConfig;
import org.eclipse.leshan.server.bootstrap.BootstrapStore;
import org.eclipse.leshan.server.bootstrap.demo.ConfigurationChecker.ConfigurationException;
import org.eclipse.leshan.util.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;
/**
* Simple bootstrap store implementation storing bootstrap information in memory
*/
public class BootstrapStoreImpl implements BootstrapStore {
private static final Logger LOG = LoggerFactory.getLogger(BootstrapStoreImpl.class);
// default location for persistence
public static final String DEFAULT_FILE = "data/bootstrap.json";
private final String filename;
private final Gson gson;
private final Type gsonType;
public BootstrapStoreImpl() {
this(DEFAULT_FILE);
}
/**
* @param filename the file path to persist the registry
*/
public BootstrapStoreImpl(String filename) {
Validate.notEmpty(filename);
GsonBuilder builder = new GsonBuilder();
builder.setPrettyPrinting();
this.gson = builder.create();
this.gsonType = new TypeToken<Map<String, BootstrapConfig>>() {
}.getType();
this.filename = filename;
this.loadFromFile();
}
private Map<String, BootstrapConfig> bootstrapByEndpoint = new ConcurrentHashMap<>();
@Override
public BootstrapConfig getBootstrap(String endpoint) {
return bootstrapByEndpoint.get(endpoint);
}
public void addConfig(String endpoint, BootstrapConfig config) throws ConfigurationException {
ConfigurationChecker.verify(config);
bootstrapByEndpoint.put(endpoint, config);
saveToFile();
}
public Map<String, BootstrapConfig> getBootstrapConfigs() {
return Collections.unmodifiableMap(bootstrapByEndpoint);
}
public boolean deleteConfig(String enpoint) {
BootstrapConfig res = bootstrapByEndpoint.remove(enpoint);
saveToFile();
return res != null;
}
// /////// File persistence
private void loadFromFile() {
try {
File file = new File(filename);
if (file.exists()) {
try (InputStreamReader in = new InputStreamReader(new FileInputStream(file))) {
Map<String, BootstrapConfig> config = gson.fromJson(in, gsonType);
bootstrapByEndpoint.putAll(config);
}
}
} catch (Exception e) {
LOG.error("Could not load bootstrap infos from file", e);
}
}
private synchronized void saveToFile() {
try {
// Create file if it does not exists.
File file = new File(filename);
if (!file.exists()) {
File parent = file.getParentFile();
if (parent != null) {
parent.mkdirs();
}
file.createNewFile();
}
// Write file
try (OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream(filename))) {
out.write(gson.toJson(getBootstrapConfigs(), gsonType));
}
} catch (Exception e) {
LOG.error("Could not save bootstrap infos to file", e);
}
}
}