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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.serviceview;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.List;
import com.google.common.collect.ImmutableList;
import com.yahoo.text.Utf8;
import edu.umd.cs.findbugs.annotations.NonNull;
/**
* Model a single service instance as a sortable object.
*
* @author <a href="mailto:steinar@yahoo-inc.com">Steinar Knutsen</a>
*/
public final class Service implements Comparable<Service> {
@NonNull
public final String serviceType;
@NonNull
public final String host;
public final int statePort;
@NonNull
public final String configId;
@NonNull
public final List<Integer> ports;
@NonNull
public final String name;
public Service(String serviceType, String host, int statePort, String clusterName, String clusterType,
String configId, List<Integer> ports, String name) {
this.serviceType = serviceType;
this.host = host.toLowerCase();
this.statePort = statePort;
this.configId = configId;
ImmutableList.Builder<Integer> portsBuilder = new ImmutableList.Builder<>();
portsBuilder.addAll(ports);
this.ports = portsBuilder.build();
this.name = name;
}
@Override
public int compareTo(Service other) {
int serviceTypeOrder = serviceType.compareTo(other.serviceType);
if (serviceTypeOrder != 0) {
return serviceTypeOrder;
}
int hostOrder = host.compareTo(other.host);
if (hostOrder != 0) {
return hostOrder;
}
return Integer.compare(statePort, other.statePort);
}
/**
* Generate an identifier string for one of the ports of this service
* suitable for using in an URL.
*
* @param port
* port which this identifier pertains to
* @return an opaque identifier string for this service
*/
public String getIdentifier(int port) {
StringBuilder b = new StringBuilder(serviceType);
b.append("-");
MessageDigest md5;
try {
md5 = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("MD5 should by definition always be available in the JVM.", e);
}
md5.update(Utf8.toBytes(serviceType));
md5.update(Utf8.toBytes(configId));
md5.update(Utf8.toBytes(host));
for (int i = 3; i >= 0; --i) {
md5.update((byte) (port >>> i));
}
byte[] digest = md5.digest();
BigInteger digestMarshal = new BigInteger(1, digest);
b.append(digestMarshal.toString(36));
return b.toString();
}
/**
* All valid identifiers for this object.
*
* @return a list with a unique ID for each of this service's ports
*/
public List<String> getIdentifiers() {
List<String> ids = new ArrayList<>(ports.size());
for (int port : ports) {
ids.add(getIdentifier(port));
}
return ids;
}
/**
* Find which port number a hash code pertains to.
*
* @param identifier a string generated from {@link #getIdentifier(int)}
* @return a port number, or 0 if no match is found
*/
public int matchIdentifierWithPort(String identifier) {
for (int port : ports) {
if (identifier.equals(getIdentifier(port))) {
return port;
}
}
throw new IllegalArgumentException("Identifier " + identifier + " matches no ports in " + this);
}
@Override
public String toString() {
final int maxLen = 3;
StringBuilder builder = new StringBuilder();
builder.append("Service [serviceType=").append(serviceType).append(", host=").append(host).append(", statePort=")
.append(statePort).append(", configId=").append(configId).append(", ports=")
.append(ports.subList(0, Math.min(ports.size(), maxLen))).append(", name=").append(name)
.append("]");
return builder.toString();
}
@Override
public int hashCode() {
final int prime = 131;
int result = 1;
result = prime * result + configId.hashCode();
result = prime * result + host.hashCode();
result = prime * result + name.hashCode();
result = prime * result + ports.hashCode();
result = prime * result + serviceType.hashCode();
result = prime * result + statePort;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
Service other = (Service) obj;
if (!configId.equals(other.configId)) {
return false;
}
if (!host.equals(other.host)) {
return false;
}
if (!name.equals(other.name)) {
return false;
}
if (!ports.equals(other.ports)) {
return false;
}
if (!serviceType.equals(other.serviceType)) {
return false;
}
if (statePort != other.statePort) {
return false;
}
return true;
}
}
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