/*
* 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;
import org.apache.avro.Schema;
import org.apache.avro.generic.GenericArray;
import org.apache.avro.generic.GenericRecord;
import org.kaaproject.kaa.client.schema.SchemaUpdatesReceiver;
import org.kaaproject.kaa.common.avro.GenericAvroConverter;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.LinkedList;
import java.util.List;
/**
* Implementation of {@link ConfigurationProcessor} using avro decoding mechanisms.
*
* @author Yaroslav Zeygerman
*/
public class DefaultConfigurationProcessor implements
ConfigurationProcessor, DecodedDeltaObservable,
SchemaUpdatesReceiver, ConfigurationProcessedObservable {
private final List<GenericDeltaReceiver> onDeltaReceived = new LinkedList<>();
private final List<ConfigurationProcessedObserver> onProcessed = new LinkedList<>();
private Schema schema;
public DefaultConfigurationProcessor() {
}
@Override
public synchronized void processConfigurationData(ByteBuffer buffer, boolean fullResync)
throws IOException {
if (buffer != null) {
if (schema == null) {
throw new ConfigurationRuntimeException(
"Can't process configuration update. Schema is null");
}
GenericAvroConverter<GenericArray<GenericRecord>> converter =
new GenericAvroConverter<>(schema);
GenericArray<GenericRecord> deltaArray = converter.decodeBinary(buffer.array());
for (GenericRecord delta : deltaArray) {
GenericRecord record = (GenericRecord) delta.get("delta");
int index = delta.getSchema().getField("delta").schema().getTypes().indexOf(
record.getSchema());
for (GenericDeltaReceiver subscriber : onDeltaReceived) {
subscriber.onDeltaReceived(index, record, fullResync);
}
}
for (ConfigurationProcessedObserver callback : onProcessed) {
callback.onConfigurationProcessed();
}
}
}
@Override
public synchronized void onSchemaUpdated(Schema schema) {
if (schema != null) {
this.schema = schema;
}
}
@Override
public void subscribeForUpdates(GenericDeltaReceiver receiver) {
if (receiver != null && !onDeltaReceived.contains(receiver)) {
onDeltaReceived.add(receiver);
}
}
@Override
public void unsubscribeFromUpdates(GenericDeltaReceiver receiver) {
if (receiver != null) {
onDeltaReceived.remove(receiver);
}
}
@Override
public void addOnProcessedCallback(ConfigurationProcessedObserver callback) {
if (callback != null && !onProcessed.contains(callback)) {
onProcessed.add(callback);
}
}
@Override
public void removeOnProcessedCallback(ConfigurationProcessedObserver callback) {
if (callback != null) {
onProcessed.remove(callback);
}
}
}