Examples of java.nio.channels.MembershipKey

java.nio.channels.MembershipKey
A token representing the membership of an Internet Protocol (IP) multicast group.
A membership key may represent a membership to receive all datagrams sent to the group, or it may be source-specific, meaning that it represents a membership that receives only datagrams from a specific source address. Whether or not a membership key is source-specific may be determined by invoking its {@link #sourceAddress() sourceAddress} method.
A membership key is valid upon creation and remains valid until the membership is dropped by invoking the {@link #drop() drop} method, orthe channel is closed. The validity of the membership key may be tested by invoking its {@link #isValid() isValid} method.
Where a membership key is not source-specific and the underlying operation system supports source filtering, then the {@link #block block} and {@link #unblock unblock} methods can be used to block or unblock multicast datagramsfrom particular source addresses. @see MulticastChannel @since 1.7

                    List<MembershipKey> keys = memberships.get(multicastAddress);
                    if (keys != null) {
                        Iterator<MembershipKey> keyIt = keys.iterator();


                        while (keyIt.hasNext()) {
                            MembershipKey key = keyIt.next();
                            if (networkInterface.equals(key.networkInterface())) {
                                if (source == null && key.sourceAddress() == null ||
                                    source != null && source.equals(key.sourceAddress())) {
                                    key.drop();
                                    keyIt.remove();
                                }
                            }
                        }
                        if (keys.isEmpty()) {

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            if (networkInterface == null) {
                throw new NullPointerException("networkInterface");
            }


            try {
                MembershipKey key;
                if (source == null) {
                    key = javaChannel().join(multicastAddress, networkInterface);
                } else {
                    key = javaChannel().join(multicastAddress, networkInterface, source);
                }

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                List<MembershipKey> keys = memberships.get(multicastAddress);
                if (keys != null) {
                    Iterator<MembershipKey> keyIt = keys.iterator();


                    while (keyIt.hasNext()) {
                        MembershipKey key = keyIt.next();
                        if (networkInterface.equals(key.networkInterface())) {
                           if (source == null && key.sourceAddress() == null ||
                               source != null && source.equals(key.sourceAddress())) {
                               key.drop();
                               keyIt.remove();
                           }
                        }
                    }
                    if (keys.isEmpty()) {

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        if (networkInterface == null) {
            throw new NullPointerException("networkInterface");
        }


        try {
            MembershipKey key;
            if (source == null) {
                key = javaChannel().join(multicastAddress, networkInterface);
            } else {
                key = javaChannel().join(multicastAddress, networkInterface, source);
            }

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                List<MembershipKey> keys = memberships.get(multicastAddress);
                if (keys != null) {
                    Iterator<MembershipKey> keyIt = keys.iterator();


                    while (keyIt.hasNext()) {
                        MembershipKey key = keyIt.next();
                        if (networkInterface.equals(key.networkInterface())) {
                           if (source == null && key.sourceAddress() == null ||
                               source != null && source.equals(key.sourceAddress())) {
                               key.drop();
                               keyIt.remove();
                           }
                        }
                    }
                    if (keys.isEmpty()) {

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        if (networkInterface == null) {
            throw new NullPointerException("networkInterface");
        }


        try {
            MembershipKey key;
            if (source == null) {
                key = channel.join(multicastAddress, networkInterface);
            } else {
                key = channel.join(multicastAddress, networkInterface, source);
            }

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                    List<MembershipKey> keys = memberships.get(multicastAddress);
                    if (keys != null) {
                        Iterator<MembershipKey> keyIt = keys.iterator();


                        while (keyIt.hasNext()) {
                            MembershipKey key = keyIt.next();
                            if (networkInterface.equals(key.networkInterface())) {
                                if (source == null && key.sourceAddress() == null ||
                                    source != null && source.equals(key.sourceAddress())) {
                                    key.drop();
                                    keyIt.remove();
                                }
                            }
                        }
                        if (keys.isEmpty()) {

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      dc.setOption(StandardSocketOptions.SO_REUSEADDR, true);
      dc.bind(new InetSocketAddress(8080));
      dc.setOption(StandardSocketOptions.IP_MULTICAST_IF, networkInterface);


      InetAddress group = InetAddress.getByName("180.90.4.12");
      MembershipKey key = dc.join(group, networkInterface);
    } catch (IOException e) {
      System.out.println(e.getMessage());
    }
  }

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