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• DCAwareRoundRobinPolicyFactory.java

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org.stuartgunter.dropwizard.cassandra.loadbalancing.DCAwareRoundRobinPolicyFactory Maven / Gradle / Ivy

package org.stuartgunter.dropwizard.cassandra.loadbalancing;

import com.datastax.driver.core.policies.DCAwareRoundRobinPolicy;
import com.datastax.driver.core.policies.LoadBalancingPolicy;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeName;

/**
 * A factory for configuring and building {@link com.datastax.driver.core.policies.DCAwareRoundRobinPolicy} instances.
 * 

 * Configuration Parameters:
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Name
Default
Description
localDC
No default.
The name of the local datacenter (as known by Cassandra).
usedHostsPerRemoteDC
No default. May only be specified when localDC is specified.
The number of host per remote datacenter that policies created by the returned factory should consider.
allowRemoteDCsForLocalConsistencyLevel
No default. May only be specified when localDC and usedHostsPerRemoteDC are specified.
Whether or not the policy may return remote host when building query plan for query having consitency LOCAL_ONE and LOCAL_QUORUM.
 */
@JsonTypeName("dcAwareRoundRobin")
public class DCAwareRoundRobinPolicyFactory implements LoadBalancingPolicyFactory {

    private String localDC;
    private Integer usedHostsPerRemoteDC;
    private Boolean allowRemoteDCsForLocalConsistencyLevel;

    @JsonProperty
    public String getLocalDC() {
        return localDC;
    }

    @JsonProperty
    public void setLocalDC(String localDC) {
        this.localDC = localDC;
    }

    @JsonProperty
    public Integer getUsedHostsPerRemoteDC() {
        return usedHostsPerRemoteDC;
    }

    @JsonProperty
    public void setUsedHostsPerRemoteDC(Integer usedHostsPerRemoteDC) {
        this.usedHostsPerRemoteDC = usedHostsPerRemoteDC;
    }

    @JsonProperty
    public Boolean getAllowRemoteDCsForLocalConsistencyLevel() {
        return allowRemoteDCsForLocalConsistencyLevel;
    }

    @JsonProperty
    public void setAllowRemoteDCsForLocalConsistencyLevel(Boolean allowRemoteDCsForLocalConsistencyLevel) {
        this.allowRemoteDCsForLocalConsistencyLevel = allowRemoteDCsForLocalConsistencyLevel;
    }

    @Override
    public LoadBalancingPolicy build() {
        if (allowRemoteDCsForLocalConsistencyLevel == null) {
            if (usedHostsPerRemoteDC == null) {
                if (localDC == null) {
                    return new DCAwareRoundRobinPolicy();
                } else {
                    return new DCAwareRoundRobinPolicy(localDC);
                }
            } else {
                return new DCAwareRoundRobinPolicy(localDC, usedHostsPerRemoteDC);
            }
        } else {
            return new DCAwareRoundRobinPolicy(localDC, usedHostsPerRemoteDC, allowRemoteDCsForLocalConsistencyLevel);
        }
    }
}