ch.epfl.eagle.daemon.nodemonitor.ConfigNodeMonitorState.java Source code

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Here is the source code for ch.epfl.eagle.daemon.nodemonitor.ConfigNodeMonitorState.java

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/*
 * EAGLE 
 *
 * Copyright 2016 Operating Systems Laboratory EPFL
 *
 * Modified from Sparrow - University of California, Berkeley 
 * 
 * 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 ch.epfl.eagle.daemon.nodemonitor;

import java.net.InetSocketAddress;
import java.util.Set;

import org.apache.commons.configuration.Configuration;
import org.apache.log4j.Logger;

import ch.epfl.eagle.daemon.EagleConf;
import ch.epfl.eagle.daemon.util.ConfigUtil;

/***
 * A {@link NodeMonitorState} implementation based on a static config file.
 */
public class ConfigNodeMonitorState implements NodeMonitorState {
    private static final Logger LOG = Logger.getLogger(ConfigNodeMonitorState.class);

    private Set<InetSocketAddress> nodeMonitors;
    private String staticAppId;

    @Override
    public void initialize(Configuration conf) {
        nodeMonitors = ConfigUtil.parseBackends(conf);
        staticAppId = conf.getString(EagleConf.STATIC_APP_NAME);
    }

    @Override
    public boolean registerBackend(String appId, InetSocketAddress nodeMonitor) {
        // Verify that the given backend information matches the static configuration.
        if (!appId.equals(staticAppId)) {
            LOG.error("Requested to register backend for app " + appId + " but was expecting app " + staticAppId);
        } else if (!nodeMonitors.contains(nodeMonitor)) {
            StringBuilder errorMessage = new StringBuilder();
            for (InetSocketAddress nodeMonitorAddress : nodeMonitors) {
                errorMessage.append(nodeMonitorAddress.toString());
            }
            throw new RuntimeException(
                    "Address " + nodeMonitor.toString() + " not found among statically configured addreses for app "
                            + appId + " (statically " + "configured addresses include: " + errorMessage.toString());
        }

        return true;
    }

    // HAWK STEALING
    @Override
    public Set<InetSocketAddress> getNodeMonitors() {
        return nodeMonitors;
    }
}