net.ttddyy.observation.tracing.ConnectionAttributesManager Maven / Gradle / Ivy

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/*
 * Copyright 2022 the original author or authors.
 *
 * 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
 *
 *      https://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 net.ttddyy.observation.tracing;

import java.sql.ResultSet;
import java.sql.Statement;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Collectors;

import javax.sql.DataSource;

import io.micrometer.common.lang.Nullable;
import io.micrometer.observation.Observation.Scope;
import net.ttddyy.dsproxy.ConnectionInfo;

/**
 * Manage attributes that belong to each connection.
 *
 * @author Tadaya Tsuyukubo
 */
public interface ConnectionAttributesManager {

	@Nullable
	ConnectionAttributes put(String connectionId, ConnectionAttributes attributes);

	@Nullable
	ConnectionAttributes get(String connectionId);

	@Nullable
	ConnectionAttributes remove(String connectionId);

	class ConnectionAttributes {

		DataSource dataSource;

		ConnectionInfo connectionInfo;

		@Nullable
		String host;

		@Nullable
		int port;

		Scope scope;

		ResultSetAttributesManager resultSetAttributesManager = new ResultSetAttributesManager();

	}

	class ResultSetAttributesManager {

		Map byResultSet = new ConcurrentHashMap<>();

		Map statements = new ConcurrentHashMap<>();

		ResultSetAttributes add(ResultSet resultSet, @Nullable Statement statement, ResultSetAttributes attributes) {
			this.byResultSet.put(resultSet, attributes);
			if (statement != null) {
				this.statements.put(resultSet, statement);
			}
			return attributes;
		}

		@Nullable
		ResultSetAttributes getByResultSet(ResultSet resultSet) {
			return this.byResultSet.get(resultSet);
		}

		@Nullable
		ResultSetAttributes removeByResultSet(ResultSet resultSet) {
			this.statements.remove(resultSet);
			return this.byResultSet.remove(resultSet);
		}

		Set removeByStatement(Statement statement) {
			Set resultSets = new HashSet<>();
			Iterator> iter = this.statements.entrySet().iterator();
			while (iter.hasNext()) {
				Entry entry = iter.next();
				if (entry.getValue().equals(statement)) {
					resultSets.add(entry.getKey());
					iter.remove();
				}
			}

			return resultSets.stream().map(this.byResultSet::remove).filter(Objects::nonNull)
					.collect(Collectors.toSet());
		}

		Set removeAll() {
			Set attributes = new HashSet<>(this.byResultSet.values());
			this.byResultSet.clear();
			this.statements.clear();
			return attributes;
		}

	}

	class ResultSetAttributes {

		Statement statement;

		Scope scope;

		ResultSetContext context;

	}

}