https://cassandra.apache.org: The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
  • Andres de la Peña
  • Avinash Lakshman
  • Aleksey Yeschenko
  • Aaron Morton
  • Ariel Weisberg
  • Blake Eggleston
  • Benedict Elliott Smith
  • Benjamin Lerer
  • Branimir Lambov
  • Brandon Williams
  • Carl Yeksigian
  • David Brosiusd
  • Dikang Gu
  • Eric Evans
  • Gary Dusbabek
  • Chris Goffinet
  • Alex Petrov
  • Laine Jaakko Olavi
  • T Jake Luciani
  • Jason Brown
  • Jonathan Ellis
  • Jake Farrell
  • Jeff Jirsa
  • Joel Knighton
  • Josh McKenzie
  • Johan Oskarsson
  • Jun Rao
  • Jay Zhuang
  • Sankalp Kohli
  • Marcus Eriksson
  • Michael Semb Wever
  • Mikhail Stepura
  • Michael Shuler
  • Paulo Motta
  • Prashant Malik
  • Robert Stupp
  • Peter Schuller
  • Sam Tunnicliffe
  • Sylvain Lebresne
  • Stefania Alborghetti
  • Tyler Hobbs
  • Vijay Parthasarathy
  • Pavel Yaskevich
  • Yuki Morishita
  • Nate McCall 
public class org.apache.cassandra.locator.Ec2Snitch extends org.apache.cassandra.locator.AbstractNetworkTopologySnitch
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.cassandra.locator.Ec2Snitch
  super_class: org.apache.cassandra.locator.AbstractNetworkTopologySnitch
{
  protected static final org.slf4j.Logger logger;
    descriptor: Lorg/slf4j/Logger;
    flags: (0x001c) ACC_PROTECTED, ACC_STATIC, ACC_FINAL

  protected static final java.lang.String ZONE_NAME_QUERY_URL;
    descriptor: Ljava/lang/String;
    flags: (0x001c) ACC_PROTECTED, ACC_STATIC, ACC_FINAL
    ConstantValue: "http://169.254.169.254/latest/meta-data/placement/availability-zone"

  private static final java.lang.String DEFAULT_DC;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "UNKNOWN-DC"

  private static final java.lang.String DEFAULT_RACK;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "UNKNOWN-RACK"

  private java.util.Map<java.net.InetAddress, java.util.Map<java.lang.String, java.lang.String>> savedEndpoints;
    descriptor: Ljava/util/Map;
    flags: (0x0002) ACC_PRIVATE
    Signature: Ljava/util/Map<Ljava/net/InetAddress;Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;>;

  protected java.lang.String ec2zone;
    descriptor: Ljava/lang/String;
    flags: (0x0004) ACC_PROTECTED

  protected java.lang.String ec2region;
    descriptor: Ljava/lang/String;
    flags: (0x0004) ACC_PROTECTED

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 45
            ldc Lorg/apache/cassandra/locator/Ec2Snitch;
            invokestatic org.slf4j.LoggerFactory.getLogger:(Ljava/lang/Class;)Lorg/slf4j/Logger;
            putstatic org.apache.cassandra.locator.Ec2Snitch.logger:Lorg/slf4j/Logger;
         1: .line 48
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=4, args_size=1
        start local 0 // org.apache.cassandra.locator.Ec2Snitch this
         0: .line 53
            aload 0 /* this */
            invokespecial org.apache.cassandra.locator.AbstractNetworkTopologySnitch.<init>:()V
         1: .line 55
            aload 0 /* this */
            ldc "http://169.254.169.254/latest/meta-data/placement/availability-zone"
            invokevirtual org.apache.cassandra.locator.Ec2Snitch.awsApiCall:(Ljava/lang/String;)Ljava/lang/String;
            astore 1 /* az */
        start local 1 // java.lang.String az
         2: .line 57
            aload 1 /* az */
            ldc "-"
            invokevirtual java.lang.String.split:(Ljava/lang/String;)[Ljava/lang/String;
            astore 2 /* splits */
        start local 2 // java.lang.String[] splits
         3: .line 58
            aload 0 /* this */
            aload 2 /* splits */
            aload 2 /* splits */
            arraylength
            iconst_1
            isub
            aaload
            putfield org.apache.cassandra.locator.Ec2Snitch.ec2zone:Ljava/lang/String;
         4: .line 61
            aload 0 /* this */
            aload 1 /* az */
            iconst_0
            aload 1 /* az */
            invokevirtual java.lang.String.length:()I
            iconst_1
            isub
            invokevirtual java.lang.String.substring:(II)Ljava/lang/String;
            putfield org.apache.cassandra.locator.Ec2Snitch.ec2region:Ljava/lang/String;
         5: .line 62
            aload 0 /* this */
            getfield org.apache.cassandra.locator.Ec2Snitch.ec2region:Ljava/lang/String;
            ldc "1"
            invokevirtual java.lang.String.endsWith:(Ljava/lang/String;)Z
            ifeq 7
         6: .line 63
            aload 0 /* this */
            aload 1 /* az */
            iconst_0
            aload 1 /* az */
            invokevirtual java.lang.String.length:()I
            iconst_3
            isub
            invokevirtual java.lang.String.substring:(II)Ljava/lang/String;
            putfield org.apache.cassandra.locator.Ec2Snitch.ec2region:Ljava/lang/String;
         7: .line 65
      StackMap locals: org.apache.cassandra.locator.Ec2Snitch java.lang.String java.lang.String[]
      StackMap stack:
            new org.apache.cassandra.locator.SnitchProperties
            dup
            invokespecial org.apache.cassandra.locator.SnitchProperties.<init>:()V
            ldc "dc_suffix"
            ldc ""
            invokevirtual org.apache.cassandra.locator.SnitchProperties.get:(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
            astore 3 /* datacenterSuffix */
        start local 3 // java.lang.String datacenterSuffix
         8: .line 66
            aload 0 /* this */
            aload 0 /* this */
            getfield org.apache.cassandra.locator.Ec2Snitch.ec2region:Ljava/lang/String;
            aload 3 /* datacenterSuffix */
            invokevirtual java.lang.String.concat:(Ljava/lang/String;)Ljava/lang/String;
            putfield org.apache.cassandra.locator.Ec2Snitch.ec2region:Ljava/lang/String;
         9: .line 67
            getstatic org.apache.cassandra.locator.Ec2Snitch.logger:Lorg/slf4j/Logger;
            ldc "EC2Snitch using region: {}, zone: {}."
            aload 0 /* this */
            getfield org.apache.cassandra.locator.Ec2Snitch.ec2region:Ljava/lang/String;
            aload 0 /* this */
            getfield org.apache.cassandra.locator.Ec2Snitch.ec2zone:Ljava/lang/String;
            invokeinterface org.slf4j.Logger.info:(Ljava/lang/String;Ljava/lang/Object;Ljava/lang/Object;)V
        10: .line 68
            return
        end local 3 // java.lang.String datacenterSuffix
        end local 2 // java.lang.String[] splits
        end local 1 // java.lang.String az
        end local 0 // org.apache.cassandra.locator.Ec2Snitch this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0   11     0              this  Lorg/apache/cassandra/locator/Ec2Snitch;
            2   11     1                az  Ljava/lang/String;
            3   11     2            splits  [Ljava/lang/String;
            8   11     3  datacenterSuffix  Ljava/lang/String;
    Exceptions:
      throws java.io.IOException, org.apache.cassandra.exceptions.ConfigurationException

  java.lang.String awsApiCall(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/String;
    flags: (0x0000) 
    Code:
      stack=4, locals=8, args_size=2
        start local 0 // org.apache.cassandra.locator.Ec2Snitch this
        start local 1 // java.lang.String url
         0: .line 73
            new java.net.URL
            dup
            aload 1 /* url */
            invokespecial java.net.URL.<init>:(Ljava/lang/String;)V
            invokevirtual java.net.URL.openConnection:()Ljava/net/URLConnection;
            checkcast java.net.HttpURLConnection
            astore 2 /* conn */
        start local 2 // java.net.HttpURLConnection conn
         1: .line 74
            aconst_null
            astore 3 /* d */
        start local 3 // java.io.DataInputStream d
         2: .line 77
            aload 2 /* conn */
            ldc "GET"
            invokevirtual java.net.HttpURLConnection.setRequestMethod:(Ljava/lang/String;)V
         3: .line 78
            aload 2 /* conn */
            invokevirtual java.net.HttpURLConnection.getResponseCode:()I
            sipush 200
            if_icmpeq 5
         4: .line 79
            new org.apache.cassandra.exceptions.ConfigurationException
            dup
            ldc "Ec2Snitch was unable to execute the API call. Not an ec2 node?"
            invokespecial org.apache.cassandra.exceptions.ConfigurationException.<init>:(Ljava/lang/String;)V
            athrow
         5: .line 82
      StackMap locals: java.net.HttpURLConnection java.io.DataInputStream
      StackMap stack:
            aload 2 /* conn */
            invokevirtual java.net.HttpURLConnection.getContentLength:()I
            istore 4 /* cl */
        start local 4 // int cl
         6: .line 83
            iload 4 /* cl */
            newarray 8
            astore 5 /* b */
        start local 5 // byte[] b
         7: .line 84
            new java.io.DataInputStream
            dup
            aload 2 /* conn */
            invokevirtual java.net.HttpURLConnection.getContent:()Ljava/lang/Object;
            checkcast java.io.FilterInputStream
            invokespecial java.io.DataInputStream.<init>:(Ljava/io/InputStream;)V
            astore 3 /* d */
         8: .line 85
            aload 3 /* d */
            aload 5 /* b */
            invokevirtual java.io.DataInputStream.readFully:([B)V
         9: .line 86
            new java.lang.String
            dup
            aload 5 /* b */
            getstatic java.nio.charset.StandardCharsets.UTF_8:Ljava/nio/charset/Charset;
            invokespecial java.lang.String.<init>:([BLjava/nio/charset/Charset;)V
            astore 7
        10: .line 89
            iconst_1
            anewarray java.io.Closeable
            dup
            iconst_0
        11: .line 90
            aload 3 /* d */
            aastore
            invokestatic org.apache.cassandra.io.util.FileUtils.close:([Ljava/io/Closeable;)V
        12: .line 91
            aload 2 /* conn */
            invokevirtual java.net.HttpURLConnection.disconnect:()V
        13: .line 86
            aload 7
            areturn
        end local 5 // byte[] b
        end local 4 // int cl
        14: .line 89
      StackMap locals:
      StackMap stack: java.lang.Throwable
            astore 6
            iconst_1
            anewarray java.io.Closeable
            dup
            iconst_0
        15: .line 90
            aload 3 /* d */
            aastore
            invokestatic org.apache.cassandra.io.util.FileUtils.close:([Ljava/io/Closeable;)V
        16: .line 91
            aload 2 /* conn */
            invokevirtual java.net.HttpURLConnection.disconnect:()V
        17: .line 92
            aload 6
            athrow
        end local 3 // java.io.DataInputStream d
        end local 2 // java.net.HttpURLConnection conn
        end local 1 // java.lang.String url
        end local 0 // org.apache.cassandra.locator.Ec2Snitch this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   18     0  this  Lorg/apache/cassandra/locator/Ec2Snitch;
            0   18     1   url  Ljava/lang/String;
            1   18     2  conn  Ljava/net/HttpURLConnection;
            2   18     3     d  Ljava/io/DataInputStream;
            6   14     4    cl  I
            7   14     5     b  [B
      Exception table:
        from    to  target  type
           2    10      14  any
    Exceptions:
      throws java.io.IOException, org.apache.cassandra.exceptions.ConfigurationException
    MethodParameters:
      Name  Flags
      url   

  public java.lang.String getRack(java.net.InetAddress);
    descriptor: (Ljava/net/InetAddress;)Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.apache.cassandra.locator.Ec2Snitch this
        start local 1 // java.net.InetAddress endpoint
         0: .line 97
            aload 1 /* endpoint */
            invokestatic org.apache.cassandra.utils.FBUtilities.getBroadcastAddress:()Ljava/net/InetAddress;
            invokevirtual java.net.InetAddress.equals:(Ljava/lang/Object;)Z
            ifeq 2
         1: .line 98
            aload 0 /* this */
            getfield org.apache.cassandra.locator.Ec2Snitch.ec2zone:Ljava/lang/String;
            areturn
         2: .line 99
      StackMap locals:
      StackMap stack:
            getstatic org.apache.cassandra.gms.Gossiper.instance:Lorg/apache/cassandra/gms/Gossiper;
            aload 1 /* endpoint */
            invokevirtual org.apache.cassandra.gms.Gossiper.getEndpointStateForEndpoint:(Ljava/net/InetAddress;)Lorg/apache/cassandra/gms/EndpointState;
            astore 2 /* state */
        start local 2 // org.apache.cassandra.gms.EndpointState state
         3: .line 100
            aload 2 /* state */
            ifnull 4
            aload 2 /* state */
            getstatic org.apache.cassandra.gms.ApplicationState.RACK:Lorg/apache/cassandra/gms/ApplicationState;
            invokevirtual org.apache.cassandra.gms.EndpointState.getApplicationState:(Lorg/apache/cassandra/gms/ApplicationState;)Lorg/apache/cassandra/gms/VersionedValue;
            ifnonnull 9
         4: .line 102
      StackMap locals: org.apache.cassandra.gms.EndpointState
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.cassandra.locator.Ec2Snitch.savedEndpoints:Ljava/util/Map;
            ifnonnull 6
         5: .line 103
            aload 0 /* this */
            invokestatic org.apache.cassandra.db.SystemKeyspace.loadDcRackInfo:()Ljava/util/Map;
            putfield org.apache.cassandra.locator.Ec2Snitch.savedEndpoints:Ljava/util/Map;
         6: .line 104
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.cassandra.locator.Ec2Snitch.savedEndpoints:Ljava/util/Map;
            aload 1 /* endpoint */
            invokeinterface java.util.Map.containsKey:(Ljava/lang/Object;)Z
            ifeq 8
         7: .line 105
            aload 0 /* this */
            getfield org.apache.cassandra.locator.Ec2Snitch.savedEndpoints:Ljava/util/Map;
            aload 1 /* endpoint */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast java.util.Map
            ldc "rack"
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast java.lang.String
            areturn
         8: .line 106
      StackMap locals:
      StackMap stack:
            ldc "UNKNOWN-RACK"
            areturn
         9: .line 108
      StackMap locals:
      StackMap stack:
            aload 2 /* state */
            getstatic org.apache.cassandra.gms.ApplicationState.RACK:Lorg/apache/cassandra/gms/ApplicationState;
            invokevirtual org.apache.cassandra.gms.EndpointState.getApplicationState:(Lorg/apache/cassandra/gms/ApplicationState;)Lorg/apache/cassandra/gms/VersionedValue;
            getfield org.apache.cassandra.gms.VersionedValue.value:Ljava/lang/String;
            areturn
        end local 2 // org.apache.cassandra.gms.EndpointState state
        end local 1 // java.net.InetAddress endpoint
        end local 0 // org.apache.cassandra.locator.Ec2Snitch this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0   10     0      this  Lorg/apache/cassandra/locator/Ec2Snitch;
            0   10     1  endpoint  Ljava/net/InetAddress;
            3   10     2     state  Lorg/apache/cassandra/gms/EndpointState;
    MethodParameters:
          Name  Flags
      endpoint  

  public java.lang.String getDatacenter(java.net.InetAddress);
    descriptor: (Ljava/net/InetAddress;)Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.apache.cassandra.locator.Ec2Snitch this
        start local 1 // java.net.InetAddress endpoint
         0: .line 113
            aload 1 /* endpoint */
            invokestatic org.apache.cassandra.utils.FBUtilities.getBroadcastAddress:()Ljava/net/InetAddress;
            invokevirtual java.net.InetAddress.equals:(Ljava/lang/Object;)Z
            ifeq 2
         1: .line 114
            aload 0 /* this */
            getfield org.apache.cassandra.locator.Ec2Snitch.ec2region:Ljava/lang/String;
            areturn
         2: .line 115
      StackMap locals:
      StackMap stack:
            getstatic org.apache.cassandra.gms.Gossiper.instance:Lorg/apache/cassandra/gms/Gossiper;
            aload 1 /* endpoint */
            invokevirtual org.apache.cassandra.gms.Gossiper.getEndpointStateForEndpoint:(Ljava/net/InetAddress;)Lorg/apache/cassandra/gms/EndpointState;
            astore 2 /* state */
        start local 2 // org.apache.cassandra.gms.EndpointState state
         3: .line 116
            aload 2 /* state */
            ifnull 4
            aload 2 /* state */
            getstatic org.apache.cassandra.gms.ApplicationState.DC:Lorg/apache/cassandra/gms/ApplicationState;
            invokevirtual org.apache.cassandra.gms.EndpointState.getApplicationState:(Lorg/apache/cassandra/gms/ApplicationState;)Lorg/apache/cassandra/gms/VersionedValue;
            ifnonnull 9
         4: .line 118
      StackMap locals: org.apache.cassandra.gms.EndpointState
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.cassandra.locator.Ec2Snitch.savedEndpoints:Ljava/util/Map;
            ifnonnull 6
         5: .line 119
            aload 0 /* this */
            invokestatic org.apache.cassandra.db.SystemKeyspace.loadDcRackInfo:()Ljava/util/Map;
            putfield org.apache.cassandra.locator.Ec2Snitch.savedEndpoints:Ljava/util/Map;
         6: .line 120
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.cassandra.locator.Ec2Snitch.savedEndpoints:Ljava/util/Map;
            aload 1 /* endpoint */
            invokeinterface java.util.Map.containsKey:(Ljava/lang/Object;)Z
            ifeq 8
         7: .line 121
            aload 0 /* this */
            getfield org.apache.cassandra.locator.Ec2Snitch.savedEndpoints:Ljava/util/Map;
            aload 1 /* endpoint */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast java.util.Map
            ldc "data_center"
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast java.lang.String
            areturn
         8: .line 122
      StackMap locals:
      StackMap stack:
            ldc "UNKNOWN-DC"
            areturn
         9: .line 124
      StackMap locals:
      StackMap stack:
            aload 2 /* state */
            getstatic org.apache.cassandra.gms.ApplicationState.DC:Lorg/apache/cassandra/gms/ApplicationState;
            invokevirtual org.apache.cassandra.gms.EndpointState.getApplicationState:(Lorg/apache/cassandra/gms/ApplicationState;)Lorg/apache/cassandra/gms/VersionedValue;
            getfield org.apache.cassandra.gms.VersionedValue.value:Ljava/lang/String;
            areturn
        end local 2 // org.apache.cassandra.gms.EndpointState state
        end local 1 // java.net.InetAddress endpoint
        end local 0 // org.apache.cassandra.locator.Ec2Snitch this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0   10     0      this  Lorg/apache/cassandra/locator/Ec2Snitch;
            0   10     1  endpoint  Ljava/net/InetAddress;
            3   10     2     state  Lorg/apache/cassandra/gms/EndpointState;
    MethodParameters:
          Name  Flags
      endpoint  
}
SourceFile: "Ec2Snitch.java"