271 lines
8.8 KiB
C++
271 lines
8.8 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Modified by Cloudius Systems.
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* Copyright 2015 Cloudius Systems.
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*/
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#pragma once
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#include <vector>
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#include "types.hh"
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#include "core/sstring.hh"
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#include "util/serialization.hh"
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#include "utils/UUID.hh"
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#include "version_generator.hh"
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namespace gms {
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/**
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* This abstraction represents the state associated with a particular node which an
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* application wants to make available to the rest of the nodes in the cluster.
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* Whenever a piece of state needs to be disseminated to the rest of cluster wrap
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* the state in an instance of <i>ApplicationState</i> and add it to the Gossiper.
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* <p></p>
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* e.g. if we want to disseminate load information for node A do the following:
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* <p></p>
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* ApplicationState loadState = new ApplicationState(<string representation of load>);
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* Gossiper.instance.addApplicationState("LOAD STATE", loadState);
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*/
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class versioned_value //implements Comparable<VersionedValue>
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{
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public:
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// this must be a char that cannot be present in any token
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static constexpr char DELIMITER = ',';
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static constexpr const char DELIMITER_STR[] = { DELIMITER, 0 };
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// values for ApplicationState.STATUS
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static constexpr const char *STATUS_BOOTSTRAPPING = "BOOT";
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static constexpr const char *STATUS_NORMAL = "NORMAL";
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static constexpr const char *STATUS_LEAVING = "LEAVING";
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static constexpr const char *STATUS_LEFT = "LEFT";
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static constexpr const char *STATUS_MOVING = "MOVING";
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static constexpr const char *REMOVING_TOKEN = "removing";
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static constexpr const char *REMOVED_TOKEN = "removed";
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static constexpr const char *HIBERNATE = "hibernate";
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// values for ApplicationState.REMOVAL_COORDINATOR
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static constexpr const char *REMOVAL_COORDINATOR = "REMOVER";
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const int version;
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const sstring value;
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private:
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versioned_value(const sstring& value, int version = version_generator::get_next_version())
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: version(version), value(value)
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{
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#if 0
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// blindly interning everything is somewhat suboptimal -- lots of VersionedValues are unique --
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// but harmless, and interning the non-unique ones saves significant memory. (Unfortunately,
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// we don't really have enough information here in VersionedValue to tell the probably-unique
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// values apart.) See CASSANDRA-6410.
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this.value = value.intern();
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#endif
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}
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versioned_value(sstring&& value, int version = version_generator::get_next_version())
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: version(version), value(std::move(value)) {
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}
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public:
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int compareTo(const versioned_value &value)
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{
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return version - value.version;
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}
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friend inline std::ostream& operator<<(std::ostream& os, const versioned_value& x) {
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return os << "Value(" << x.value << "," << x.version << ")";
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}
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#if 0
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private static String versionString(String... args)
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{
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return StringUtils.join(args, VersionedValue.DELIMITER);
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}
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#endif
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class versioned_value_factory
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{
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public:
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#if 0
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final IPartitioner partitioner;
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public VersionedValueFactory(IPartitioner partitioner)
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{
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this.partitioner = partitioner;
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}
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#endif
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versioned_value clone_with_higher_version(const versioned_value& value)
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{
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return versioned_value(value.value);
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}
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#if 0
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public versioned_value bootstrapping(const std::vector<token> tokens)
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{
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return new versioned_value(versionString(VersionedValue.STATUS_BOOTSTRAPPING,
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makeTokenString(tokens)));
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}
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public VersionedValue normal(Collection<Token> tokens)
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{
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return new VersionedValue(versionString(VersionedValue.STATUS_NORMAL,
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makeTokenString(tokens)));
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}
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private String makeTokenString(Collection<Token> tokens)
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{
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return partitioner.getTokenFactory().toString(Iterables.get(tokens, 0));
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}
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#endif
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versioned_value load(double load)
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{
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return versioned_value(to_sstring_sprintf(load, "%g"));
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}
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versioned_value schema(const utils::UUID &new_version)
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{
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return versioned_value(new_version.to_sstring());
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}
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#if 0
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versioned_value leaving(Collection<Token> tokens)
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{
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return new VersionedValue(versionString(VersionedValue.STATUS_LEAVING,
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makeTokenString(tokens)));
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}
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public VersionedValue left(Collection<Token> tokens, long expireTime)
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{
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return new VersionedValue(versionString(VersionedValue.STATUS_LEFT,
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makeTokenString(tokens),
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Long.toString(expireTime)));
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}
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public VersionedValue moving(Token token)
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{
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return new VersionedValue(VersionedValue.STATUS_MOVING + VersionedValue.DELIMITER + partitioner.getTokenFactory().toString(token));
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}
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#endif
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versioned_value host_id(const utils::UUID& hostId)
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{
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return versioned_value(hostId.to_sstring());
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}
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#if 0
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public VersionedValue tokens(Collection<Token> tokens)
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{
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ByteArrayOutputStream bos = new ByteArrayOutputStream();
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DataOutputStream out = new DataOutputStream(bos);
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try
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{
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TokenSerializer.serialize(partitioner, tokens, out);
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}
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catch (IOException e)
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{
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throw new RuntimeException(e);
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}
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return new VersionedValue(new String(bos.toByteArray(), ISO_8859_1));
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}
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#endif
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versioned_value removing_nonlocal(const utils::UUID& hostId)
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{
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return versioned_value(sstring(REMOVING_TOKEN) + sstring(DELIMITER_STR) + hostId.to_sstring());
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}
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versioned_value removed_nonlocal(const utils::UUID& hostId, int64_t expireTime)
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{
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return versioned_value(sstring(REMOVED_TOKEN) + sstring(DELIMITER_STR) + hostId.to_sstring() + sstring(DELIMITER_STR) + to_sstring(expireTime));
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}
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versioned_value removal_coordinator(const utils::UUID& hostId)
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{
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return versioned_value(sstring(REMOVAL_COORDINATOR) + sstring(DELIMITER_STR) + hostId.to_sstring());
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}
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versioned_value hibernate(bool value)
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{
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return versioned_value(sstring(HIBERNATE) + sstring(DELIMITER_STR) + (value ? "true" : "false"));
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}
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versioned_value datacenter(const sstring& dcId)
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{
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return versioned_value(dcId);
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}
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versioned_value rack(const sstring &rackId)
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{
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return versioned_value(rackId);
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}
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#if 0
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public VersionedValue rpcaddress(InetAddress endpoint)
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{
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return new VersionedValue(endpoint.getHostAddress());
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}
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public VersionedValue releaseVersion()
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{
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return new VersionedValue(FBUtilities.getReleaseVersionString());
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}
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public VersionedValue networkVersion()
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{
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return new VersionedValue(String.valueOf(MessagingService.current_version));
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}
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#endif
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versioned_value internalIP(const sstring &private_ip)
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{
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return versioned_value(private_ip);
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}
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versioned_value severity(double value)
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{
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return versioned_value(to_sstring_sprintf(value, "%g"));
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}
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};
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// The following replaces VersionedValueSerializer from the Java code
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public:
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void serialize(std::ostream& out) const {
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serialize_string(out, value);
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serialize_int32(out, version);
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}
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static versioned_value deserialize(bytes_view& v) {
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auto value = read_simple_short_string(v);
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auto version = read_simple<int32_t>(v);
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return versioned_value(std::move(value), version);
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}
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size_t serialized_size() const {
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return serialize_string_size(value) + serialize_int32_size;
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}
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}; // class versioned_value
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} // namespace gms
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