com.palantir.leader.PaxosLeadershipToken.java Source code

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Here is the source code for com.palantir.leader.PaxosLeadershipToken.java

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/**
 * Copyright 2015 Palantir Technologies
 *
 * Licensed under the BSD-3 License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://opensource.org/licenses/BSD-3-Clause
 *
 * 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 com.palantir.leader;

import org.apache.commons.lang.builder.CompareToBuilder;

import com.palantir.common.annotation.Immutable;
import com.palantir.leader.LeaderElectionService.LeadershipToken;
import com.palantir.paxos.PaxosValue;

@Immutable
public class PaxosLeadershipToken implements LeadershipToken {
    private static final long serialVersionUID = 1L;

    final PaxosValue value;

    public PaxosLeadershipToken(PaxosValue value) {
        this.value = value;
    }

    @Override
    public boolean sameAs(LeadershipToken o) {
        if ((o == null) || (o.getClass() != this.getClass())) {
            return false;
        }
        PaxosValue v = ((PaxosLeadershipToken) o).value;
        if (value == v) {
            return true;
        }
        return value != null && v != null
                && (new CompareToBuilder().append(value.getLeaderUUID(), v.getLeaderUUID())
                        .append(value.getRound(), v.getRound()).append(value.getData(), v.getData())
                        .toComparison() == 0);
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((value == null) ? 0 : value.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        PaxosLeadershipToken other = (PaxosLeadershipToken) obj;
        if (value == null) {
            if (other.value != null) {
                return false;
            }
        } else if (!value.equals(other.value)) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "PaxosLeadershipToken{" + value + '}';
    }
}