Package com.netflix.eureka.resources

Source Code of com.netflix.eureka.resources.StatusResource

/*
* Copyright 2012 Netflix, 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 com.netflix.eureka.resources;

import java.net.URI;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.netflix.appinfo.ApplicationInfoManager;
import com.netflix.appinfo.InstanceInfo;
import com.netflix.discovery.shared.Application;
import com.netflix.eureka.PeerAwareInstanceRegistry;
import com.netflix.eureka.cluster.PeerEurekaNode;
import com.netflix.eureka.util.StatusInfo;
import com.netflix.eureka.util.StatusInfo.Builder;

/**
* An utility class for exposing information about peer nodes.
*
* @author Karthik Ranganathan, Greg Kim
*/
@Path("/{version}/status")
@Produces({ "application/xml", "application/json" })
public class StatusResource {
    private static final Logger logger = LoggerFactory
    .getLogger(StatusResource.class);
    private static final String DATE_FORMAT = "yyyy-MM-dd'T'HH:mm:ss Z";

    private final PeerAwareInstanceRegistry registry = PeerAwareInstanceRegistry
    .getInstance();

    @GET
    public StatusInfo getStatusInfo() {
        Builder builder = Builder.newBuilder();
        // Add application level status
        StringBuilder upReplicas = new StringBuilder();
        StringBuilder downReplicas = new StringBuilder();

        StringBuilder replicaHostNames = new StringBuilder();
        String myAppName = ApplicationInfoManager.getInstance().getInfo()
        .getAppName();

        for (PeerEurekaNode node : registry.getReplicaNodes()) {
            if (replicaHostNames.length() > 0) {
                replicaHostNames.append(", ");
            }
            replicaHostNames.append(node.getServiceUrl());
            if (isReplicaAvailable(myAppName, node.getServiceUrl())) {
                upReplicas.append(node.getServiceUrl()).append(',');
            } else {
                downReplicas.append(node.getServiceUrl()).append(',');
            }
        }

        builder.add("registered-replicas", replicaHostNames.toString());
        builder.add("available-replicas", upReplicas.toString());
        builder.add("unavailable-replicas", downReplicas.toString());

        return builder.build();
    }

    private boolean isReplicaAvailable(String myAppName, String url) {

        try {
            String givenHostName = new URI(url).getHost();
            Application app = PeerAwareInstanceRegistry.getInstance()
            .getApplication(myAppName, false);
            for (InstanceInfo info : app.getInstances()) {
                if (info.getHostName().equals(givenHostName)) {
                    return true;
                }
            }
            givenHostName = new URI(url).getHost();
        } catch (Throwable e) {
            logger.error("Could not determine if the replica is available ", e);
        }
        return false;
    }

    public static String getCurrentTimeAsString() {
        SimpleDateFormat format = new SimpleDateFormat(DATE_FORMAT);
        return format.format(new Date());
    }
}
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