org.springframework.cloud.etcd.discovery.EtcdLifecycle.java Source code

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Here is the source code for org.springframework.cloud.etcd.discovery.EtcdLifecycle.java

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/*
 * Copyright 2013-2015 the original author or authors.
 *
 * 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.springframework.cloud.etcd.discovery;

import mousio.etcd4j.EtcdClient;
import mousio.etcd4j.responses.EtcdException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.cloud.client.discovery.AbstractDiscoveryLifecycle;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

/**
 * @author Spencer Gibb
 */
public class EtcdLifecycle extends AbstractDiscoveryLifecycle {

    private static final Log log = LogFactory.getLog(EtcdLifecycle.class);

    private final EtcdClient etcd;
    private final EtcdDiscoveryProperties props;
    private final Service service = new Service();

    public EtcdLifecycle(EtcdClient etcd, EtcdDiscoveryProperties props) {
        this.etcd = etcd;
        this.props = props;
    }

    @Override
    protected void register() {
        Assert.notNull(service.getPort(), "service.port has not been set");

        service.setAppName(getAppName());
        service.setId(getContext().getId());

        register(service);
    }

    @Scheduled(initialDelayString = "${spring.cloud.etcd.discovery.heartbeatInterval:25000}", fixedRateString = "${spring.cloud.etcd.discovery.heartbeatInterval:25000}")
    protected void sendHeartbeat() {
        register();
    }

    @Override
    protected void registerManagement() {
        Service management = new Service();
        management.setId(getManagementServiceId());
        management.setAppName(getManagementServiceName());
        management.setPort(getManagementPort());

        register(management);
    }

    protected void register(Service service) {
        try {
            log.info("Registering service with etcd: " + service);
            String key = getServiceKey(service.appName, service.getId());
            //TODO: what should be serialized about the service?
            String value = props.getHostname() + ":" + service.getPort();
            etcd.put(key, value).ttl(props.getTtl()).send().get();
        } catch (IOException | TimeoutException | EtcdException e) {
            ReflectionUtils.rethrowRuntimeException(e);
        }
    }

    private String getServiceKey(String appName, String serviceId) {
        return getAppKey(appName) + "/" + serviceId;
    }

    public String getAppKey(String appName) {
        return props.getDiscoveryPrefix() + "/" + appName;
    }

    class Service {
        String appName;
        String id;
        Integer port;

        public Service() {
        }

        public Service(String appName, String id, Integer port) {
            this.appName = appName;
            this.id = id;
            this.port = port;
        }

        public String getAppName() {
            return appName;
        }

        public void setAppName(String appName) {
            this.appName = appName;
        }

        public String getId() {
            return id;
        }

        public void setId(String id) {
            this.id = id;
        }

        public Integer getPort() {
            return port;
        }

        public void setPort(Integer port) {
            this.port = port;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o)
                return true;
            if (o == null || getClass() != o.getClass())
                return false;

            Service service = (Service) o;

            if (appName != null ? !appName.equals(service.appName) : service.appName != null)
                return false;
            if (id != null ? !id.equals(service.id) : service.id != null)
                return false;
            return port != null ? port.equals(service.port) : service.port == null;
        }

        @Override
        public int hashCode() {
            int result = appName != null ? appName.hashCode() : 0;
            result = 31 * result + (id != null ? id.hashCode() : 0);
            result = 31 * result + (port != null ? port.hashCode() : 0);
            return result;
        }

        @Override
        public String toString() {
            return String.format("Service{appName='%s', id='%s', port=%d}", appName, id, port);
        }
    }

    @Override
    protected int getConfiguredPort() {
        return service.getPort() == null ? 0 : service.getPort();
    }

    @Override
    protected void setConfiguredPort(int port) {
        service.setPort(port);
    }

    @Override
    protected EtcdDiscoveryProperties getConfiguration() {
        return props;
    }

    @Override
    protected void deregister() {
        deregister(getAppName(), getContext().getId());
    }

    @Override
    protected void deregisterManagement() {
        deregister(getAppName(), getManagementServiceName());
    }

    private void deregister(String appName, String serviceId) {
        try {
            etcd.delete(getServiceKey(appName, serviceId)).send();
        } catch (IOException e) {
            ReflectionUtils.rethrowRuntimeException(e);
        }
    }

    @Override
    protected boolean isEnabled() {
        return props.isEnabled();
    }

    public EtcdClient getEtcd() {
        return etcd;
    }

    public EtcdDiscoveryProperties getProps() {
        return props;
    }

    public Service getService() {
        return service;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o)
            return true;
        if (o == null || getClass() != o.getClass())
            return false;

        EtcdLifecycle that = (EtcdLifecycle) o;

        if (etcd != null ? !etcd.equals(that.etcd) : that.etcd != null)
            return false;
        if (props != null ? !props.equals(that.props) : that.props != null)
            return false;
        if (service != null ? !service.equals(that.service) : that.service != null)
            return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = etcd != null ? etcd.hashCode() : 0;
        result = 31 * result + (props != null ? props.hashCode() : 0);
        result = 31 * result + (service != null ? service.hashCode() : 0);
        return result;
    }

    @Override
    public String toString() {
        return String.format("EtcdLifecycle{etcd=%s, props=%s, service=%s}", etcd, props, service);
    }
}