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Trino - Prometheus connector

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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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 io.trino.plugin.prometheus;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import io.trino.spi.HostAddress;
import io.trino.spi.connector.ConnectorSplit;

import java.net.URI;
import java.util.List;
import java.util.Map;

import static io.airlift.slice.SizeOf.estimatedSizeOf;
import static io.airlift.slice.SizeOf.instanceSize;
import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.joining;

public class PrometheusSplit
        implements ConnectorSplit
{
    private static final int INSTANCE_SIZE = instanceSize(PrometheusSplit.class);

    private final String uri;
    private final List addresses;

    @JsonCreator
    public PrometheusSplit(@JsonProperty("uri") String uri)
    {
        this.uri = requireNonNull(uri, "uri is null");

        addresses = ImmutableList.of(HostAddress.fromUri(URI.create(uri)));
    }

    @JsonProperty
    public String getUri()
    {
        return uri;
    }

    @Override
    public List getAddresses()
    {
        return addresses;
    }

    @Override
    public Map getSplitInfo()
    {
        return ImmutableMap.of("addresses", addresses.stream().map(HostAddress::toString).collect(joining(",")));
    }

    @Override
    public long getRetainedSizeInBytes()
    {
        return INSTANCE_SIZE
                + estimatedSizeOf(uri)
                + estimatedSizeOf(addresses, HostAddress::getRetainedSizeInBytes);
    }
}