org.apache.ambari.msi.ConfigurationProvider.java Source code

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Here is the source code for org.apache.ambari.msi.ConfigurationProvider.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.ambari.msi;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.xml.StaxDriver;
import org.apache.ambari.server.controller.internal.ResourceImpl;
import org.apache.ambari.server.controller.spi.Predicate;
import org.apache.ambari.server.controller.spi.Request;
import org.apache.ambari.server.controller.spi.Resource;
import org.apache.ambari.server.controller.utilities.PropertyHelper;
import org.apache.commons.lang.StringUtils;

import java.io.InputStream;
import java.util.AbstractMap;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 * Configuration provider for a MSI defined cluster.
 */
public class ConfigurationProvider extends BaseResourceProvider {

    protected static final String CONFIGURATION_CLUSTER_NAME_PROPERTY_ID = PropertyHelper.getPropertyId("Config",
            "cluster_name");
    public static final String CONFIGURATION_CONFIG_TYPE_PROPERTY_ID = PropertyHelper.getPropertyId(null, "type");
    public static final String CONFIGURATION_CONFIG_TAG_PROPERTY_ID = PropertyHelper.getPropertyId(null, "tag");

    private Map<String, Map<String, String>> allConfigs;

    private static final String DESTINATION = "xml";
    private static final Set<String> clusterConfigurationResources = new HashSet<String>();

    static {
        clusterConfigurationResources.add("hdfs-site");
        clusterConfigurationResources.add("mapred-site");
        clusterConfigurationResources.add("hbase-site");
        clusterConfigurationResources.add("yarn-site");
        clusterConfigurationResources.add("core-site");
    }

    // ----- AbstractResourceProvider ------------------------------------------

    @Override
    public void updateProperties(Resource resource, Request request, Predicate predicate) {
        // Do nothing
    }

    @Override
    public int updateProperties(Resource resource, Map<String, Object> properties) {
        // Do nothing
        return -1;
    }

    public ConfigurationProvider(ClusterDefinition clusterDefinition) {
        super(Resource.Type.Configuration, clusterDefinition);
        init();
        initConfigurationResources();
    }

    class ScomConfigConverter implements Converter {
        @Override
        public void marshal(Object o, HierarchicalStreamWriter hierarchicalStreamWriter,
                MarshallingContext marshallingContext) {
        }

        @Override
        public Object unmarshal(HierarchicalStreamReader hierarchicalStreamReader,
                UnmarshallingContext unmarshallingContext) {
            Map<String, String> map = new HashMap<String, String>();

            while (hierarchicalStreamReader.hasMoreChildren()) {
                hierarchicalStreamReader.moveDown();
                String name = "", value = "";
                while (hierarchicalStreamReader.hasMoreChildren()) {
                    hierarchicalStreamReader.moveDown();
                    if ("name".equalsIgnoreCase(hierarchicalStreamReader.getNodeName())) {
                        name = hierarchicalStreamReader.getValue();
                    }
                    if ("value".equalsIgnoreCase(hierarchicalStreamReader.getNodeName())) {
                        value = hierarchicalStreamReader.getValue();
                    }
                    hierarchicalStreamReader.moveUp();
                }

                if (StringUtils.isNotEmpty(name) && StringUtils.isNotEmpty(value)) {
                    map.put(name, value);
                }
                hierarchicalStreamReader.moveUp();
            }

            return map;
        }

        @Override
        public boolean canConvert(Class aClass) {
            return AbstractMap.class.isAssignableFrom(aClass);
        }
    }

    @SuppressWarnings("unchecked")
    private void init() {
        allConfigs = new HashMap<String, Map<String, String>>();

        XStream xstream = new XStream(new StaxDriver());
        xstream.alias("configuration", Map.class);
        xstream.registerConverter(new ScomConfigConverter());

        for (String configurationResource : clusterConfigurationResources) {
            String configFileName = configurationResource + "." + DESTINATION;
            InputStream is = ClassLoader.getSystemResourceAsStream(configFileName);
            if (is == null)
                continue;
            Map<String, String> properties = (HashMap<String, String>) xstream.fromXML(is);
            allConfigs.put(configurationResource, properties);
        }
    }

    private void initConfigurationResources() {
        String clusterName = getClusterDefinition().getClusterName();

        for (String type : allConfigs.keySet()) {
            Resource resource = new ResourceImpl(Resource.Type.Configuration);
            resource.setProperty(CONFIGURATION_CLUSTER_NAME_PROPERTY_ID, clusterName);
            resource.setProperty(CONFIGURATION_CONFIG_TYPE_PROPERTY_ID, type);
            resource.setProperty(CONFIGURATION_CONFIG_TAG_PROPERTY_ID, "version1");

            Map<String, String> properties = allConfigs.get(type);
            for (Map.Entry<String, String> entry : properties.entrySet()) {
                String id = PropertyHelper.getPropertyId("properties", entry.getKey());
                resource.setProperty(id, entry.getValue());
            }

            addResource(resource);
        }
    }
}