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AbstractConfigurationManager.java
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AbstractConfigurationManager.java
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/*
* Copyright 2014-2016 CyberVision, Inc.
*
* Licensed 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.kaaproject.kaa.client.configuration.base;
import org.kaaproject.kaa.client.KaaClientProperties;
import org.kaaproject.kaa.client.configuration.ConfigurationHashContainer;
import org.kaaproject.kaa.client.configuration.ConfigurationProcessor;
import org.kaaproject.kaa.client.configuration.storage.ConfigurationStorage;
import org.kaaproject.kaa.client.context.ExecutorContext;
import org.kaaproject.kaa.client.persistence.KaaClientState;
import org.kaaproject.kaa.common.hash.EndpointObjectHash;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
public abstract class AbstractConfigurationManager implements ConfigurationManager {
private static final Logger LOG = LoggerFactory.getLogger(AbstractConfigurationManager.class);
protected final ConfigurationDeserializer deserializer;
private final Set<ConfigurationListener> listeners = Collections.newSetFromMap(
new ConcurrentHashMap<ConfigurationListener, Boolean>());
private final KaaClientProperties properties;
private final ExecutorContext executorContext;
private volatile byte[] configurationData;
private ConfigurationStorage storage;
private ConfigurationHashContainer container = new HashContainer();
private KaaClientState state;
public AbstractConfigurationManager(KaaClientProperties properties, KaaClientState state,
ExecutorContext executorContext) {
super();
this.properties = properties;
this.state = state;
this.executorContext = executorContext;
this.deserializer = new ConfigurationDeserializer(executorContext);
}
private static byte[] toByteArray(ByteBuffer buffer) {
if (buffer == null) {
return null;
}
byte[] bytes = new byte[buffer.remaining()];
buffer.get(bytes);
return bytes;
}
@Override
public void init() {
getConfigurationData();
}
@Override
public boolean addListener(ConfigurationListener listener) {
if (listener != null) {
LOG.trace("Adding listener {}", listener);
return listeners.add(listener);
} else {
throw new RuntimeException("Can't add null as a listener");
}
}
@Override
public boolean removeListener(ConfigurationListener listener) {
if (listener != null) {
return listeners.remove(listener);
} else {
throw new RuntimeException("Can't remove null listener");
}
}
@Override
public ConfigurationProcessor getConfigurationProcessor() {
return new ConfigurationProcessor() {
@Override
public void processConfigurationData(ByteBuffer buffer, boolean fullResync)
throws IOException {
if (fullResync) {
configurationData = toByteArray(buffer);
if (LOG.isTraceEnabled()) {
LOG.trace("Received configuration data {}", Arrays.toString(configurationData));
}
if (storage != null) {
LOG.debug("Persisting configuration data from storage {}", storage);
storage.saveConfiguration(ByteBuffer.wrap(configurationData));
LOG.debug("Persisted configuration data from storage {}", storage);
}
deserializer.notify(Collections.unmodifiableCollection(listeners), configurationData);
} else {
LOG.warn("Only full resync delta is supported!");
}
}
};
}
@Override
public void setConfigurationStorage(ConfigurationStorage storage) {
this.storage = storage;
}
@Override
public ConfigurationHashContainer getConfigurationHashContainer() {
return container;
}
protected byte[] getConfigurationData() {
if (configurationData == null) {
configurationData = loadConfigurationData();
}
return configurationData;
}
private byte[] loadConfigurationData() {
if (storage != null) {
if (state.isConfigurationVersionUpdated()) {
LOG.info("Clearing old configuration data from storage {}", storage);
try {
storage.clearConfiguration();
} catch (IOException ex) {
LOG.error("Failed to clear configuration from storage", ex);
}
} else {
LOG.debug("Loading configuration data from storage {}", storage);
try {
configurationData = toByteArray(storage.loadConfiguration());
} catch (IOException ex) {
LOG.error("Failed to load configuration from storage", ex);
}
}
}
if (configurationData == null) {
LOG.debug("Loading configuration data from defaults {}", storage);
configurationData = getDefaultConfigurationData();
}
if (LOG.isTraceEnabled()) {
LOG.trace("Loaded configuration data {}", Arrays.toString(configurationData));
}
return configurationData;
}
protected byte[] getDefaultConfigurationData() {
return properties.getDefaultConfigData();
}
private class HashContainer implements ConfigurationHashContainer {
@Override
public EndpointObjectHash getConfigurationHash() {
return EndpointObjectHash.fromSha1(getConfigurationData());
}
}
}