systems.composable.dropwizard.cassandra.loadbalancing.ErrorAwarePolicyFactory Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of dropwizard-cassandra Show documentation

Cassandra library for Dropwizard

The newest version!

package systems.composable.dropwizard.cassandra.loadbalancing;

import com.datastax.driver.core.policies.ErrorAwarePolicy;
import com.datastax.driver.core.policies.LoadBalancingPolicy;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeName;
import io.dropwizard.util.Duration;

import javax.validation.Valid;
import javax.validation.constraints.NotNull;

/**
 * A factory for configuring and building {@link ErrorAwarePolicy} instances.
 * 
 * Configuration Parameters:
 * 
 *     
 *         
 *         
 *         
 *     
 *     
 *         
 *         
 *         
 *     
 *     
 *         
 *         
 *         
 *     
 *     
 *         
 *         
 *         
 *     
 * Name Default Description
subPolicy No default. You must provide a child policy. The load balancing policy to wrap with error awareness.
maxErrorsPerMinute Inherits the default from {@link ErrorAwarePolicy.Builder} The maximum number of errors allowed per minute for each host.
retryPeriod Inherits the default from {@link ErrorAwarePolicy.Builder} The time during which a host is excluded by the policy once it has exceeded {@link #maxErrorsPerMinute}
 */
@JsonTypeName("errorAware")
public class ErrorAwarePolicyFactory implements LoadBalancingPolicyFactory {

    @Valid
    @NotNull
    private LoadBalancingPolicyFactory subPolicy;

    private Integer maxErrorsPerMinute;

    private Duration retryPeriod;

    @JsonProperty
    public LoadBalancingPolicyFactory getSubPolicy() {
        return subPolicy;
    }

    @JsonProperty
    public void setSubPolicy(LoadBalancingPolicyFactory subPolicy) {
        this.subPolicy = subPolicy;
    }

    @JsonProperty
    public Integer getMaxErrorsPerMinute() {
        return maxErrorsPerMinute;
    }

    @JsonProperty
    public void setMaxErrorsPerMinute(Integer maxErrorsPerMinute) {
        this.maxErrorsPerMinute = maxErrorsPerMinute;
    }

    @JsonProperty
    public Duration getRetryPeriod() {
        return retryPeriod;
    }

    @JsonProperty
    public void setRetryPeriod(Duration retryPeriod) {
        this.retryPeriod = retryPeriod;
    }

    @Override
    public LoadBalancingPolicy build() {
        ErrorAwarePolicy.Builder builder = ErrorAwarePolicy.builder(subPolicy.build());

        if (maxErrorsPerMinute != null) {
            builder.withMaxErrorsPerMinute(maxErrorsPerMinute);
        }

        if (retryPeriod != null) {
            builder.withRetryPeriod(retryPeriod.getQuantity(), retryPeriod.getUnit());
        }

        return builder.build();
    }
}

Name	Default	Description
subPolicy	No default. You must provide a child policy.	The load balancing policy to wrap with error awareness.
maxErrorsPerMinute	Inherits the default from {@link ErrorAwarePolicy.Builder}	The maximum number of errors allowed per minute for each host.
retryPeriod	Inherits the default from {@link ErrorAwarePolicy.Builder}	The time during which a host is excluded by the policy once it has exceeded {@link #maxErrorsPerMinute}