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A library for creating isolated embedded databases for Spring-powered integration tests.
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/*
 * Copyright 2020 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
 *
 *      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.zonky.test.db.provider.support;

import io.zonky.test.db.provider.EmbeddedDatabase;

import java.io.PrintWriter;
import java.sql.Array;
import java.sql.Blob;
import java.sql.CallableStatement;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.NClob;
import java.sql.PreparedStatement;
import java.sql.SQLClientInfoException;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.sql.SQLWarning;
import java.sql.SQLXML;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Struct;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Executor;
import java.util.concurrent.Semaphore;
import java.util.logging.Logger;

/**
 * Blocking data source wrapper that should avoid to exhaustion of database connections.
 * It is a better choice than using a connection pool because database connections can be released as soon as possible.
 */
public class BlockingDatabaseWrapper implements EmbeddedDatabase {

    private final EmbeddedDatabase delegate;
    private final Semaphore semaphore;

    public BlockingDatabaseWrapper(EmbeddedDatabase delegate, Semaphore semaphore) {
        this.delegate = delegate;
        this.semaphore = semaphore;
    }

    @Override
    public Connection getConnection() throws SQLException {
        semaphore.acquireUninterruptibly();
        Connection connection = delegate.getConnection();
        return new BlockingConnectionWrapper(connection, semaphore);
    }

    @Override
    public Connection getConnection(String username, String password) throws SQLException {
        semaphore.acquireUninterruptibly();
        Connection connection = delegate.getConnection(username, password);
        return new BlockingConnectionWrapper(connection, semaphore);
    }

    @Override
    public PrintWriter getLogWriter() throws SQLException {
        return delegate.getLogWriter();
    }

    @Override
    public void setLogWriter(PrintWriter out) throws SQLException {
        delegate.setLogWriter(out);
    }

    @Override
    public void setLoginTimeout(int seconds) throws SQLException {
        delegate.setLoginTimeout(seconds);
    }

    @Override
    public int getLoginTimeout() throws SQLException {
        return delegate.getLoginTimeout();
    }

    @Override
    public Logger getParentLogger() throws SQLFeatureNotSupportedException {
        return delegate.getParentLogger();
    }

    @Override
    public  T unwrap(Class iface) throws SQLException {
        if (iface.isAssignableFrom(getClass())) {
            return iface.cast(this);
        }
        return delegate.unwrap(iface);
    }

    @Override
    public boolean isWrapperFor(Class iface) throws SQLException {
        if (iface.isAssignableFrom(getClass())) {
            return true;
        }
        return delegate.isWrapperFor(iface);
    }

    @Override
    public String getJdbcUrl() {
        return delegate.getJdbcUrl();
    }

    @Override
    public void close() {
        delegate.close();
    }

    protected static class BlockingConnectionWrapper implements Connection {

        private final Connection delegate;
        private final Semaphore semaphore;

        private BlockingConnectionWrapper(Connection delegate, Semaphore semaphore) {
            this.delegate = delegate;
            this.semaphore = semaphore;
        }

        @Override
        public Statement createStatement() throws SQLException {
            return delegate.createStatement();
        }

        @Override
        public PreparedStatement prepareStatement(String sql) throws SQLException {
            return delegate.prepareStatement(sql);
        }

        @Override
        public CallableStatement prepareCall(String sql) throws SQLException {
            return delegate.prepareCall(sql);
        }

        @Override
        public String nativeSQL(String sql) throws SQLException {
            return delegate.nativeSQL(sql);
        }

        @Override
        public void setAutoCommit(boolean autoCommit) throws SQLException {
            delegate.setAutoCommit(autoCommit);
        }

        @Override
        public boolean getAutoCommit() throws SQLException {
            return delegate.getAutoCommit();
        }

        @Override
        public void commit() throws SQLException {
            delegate.commit();
        }

        @Override
        public void rollback() throws SQLException {
            delegate.rollback();
        }

        @Override
        public void close() throws SQLException {
            delegate.close();
            semaphore.release();
        }

        @Override
        public boolean isClosed() throws SQLException {
            return delegate.isClosed();
        }

        @Override
        public DatabaseMetaData getMetaData() throws SQLException {
            return delegate.getMetaData();
        }

        @Override
        public void setReadOnly(boolean readOnly) throws SQLException {
            delegate.setReadOnly(readOnly);
        }

        @Override
        public boolean isReadOnly() throws SQLException {
            return delegate.isReadOnly();
        }

        @Override
        public void setCatalog(String catalog) throws SQLException {
            delegate.setCatalog(catalog);
        }

        @Override
        public String getCatalog() throws SQLException {
            return delegate.getCatalog();
        }

        @Override
        public void setTransactionIsolation(int level) throws SQLException {
            delegate.setTransactionIsolation(level);
        }

        @Override
        public int getTransactionIsolation() throws SQLException {
            return delegate.getTransactionIsolation();
        }

        @Override
        public SQLWarning getWarnings() throws SQLException {
            return delegate.getWarnings();
        }

        @Override
        public void clearWarnings() throws SQLException {
            delegate.clearWarnings();
        }

        @Override
        public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {
            return delegate.createStatement(resultSetType, resultSetConcurrency);
        }

        @Override
        public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
            return delegate.prepareStatement(sql, resultSetType, resultSetConcurrency);
        }

        @Override
        public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
            return delegate.prepareCall(sql, resultSetType, resultSetConcurrency);
        }

        @Override
        public Map> getTypeMap() throws SQLException {
            return delegate.getTypeMap();
        }

        @Override
        public void setTypeMap(Map> map) throws SQLException {
            delegate.setTypeMap(map);
        }

        @Override
        public void setHoldability(int holdability) throws SQLException {
            delegate.setHoldability(holdability);
        }

        @Override
        public int getHoldability() throws SQLException {
            return delegate.getHoldability();
        }

        @Override
        public Savepoint setSavepoint() throws SQLException {
            return delegate.setSavepoint();
        }

        @Override
        public Savepoint setSavepoint(String name) throws SQLException {
            return delegate.setSavepoint(name);
        }

        @Override
        public void rollback(Savepoint savepoint) throws SQLException {
            delegate.rollback(savepoint);
        }

        @Override
        public void releaseSavepoint(Savepoint savepoint) throws SQLException {
            delegate.releaseSavepoint(savepoint);
        }

        @Override
        public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
            return delegate.createStatement(resultSetType, resultSetConcurrency, resultSetHoldability);
        }

        @Override
        public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
            return delegate.prepareStatement(sql, resultSetType, resultSetConcurrency, resultSetHoldability);
        }

        @Override
        public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
            return delegate.prepareCall(sql, resultSetType, resultSetConcurrency, resultSetHoldability);
        }

        @Override
        public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {
            return delegate.prepareStatement(sql, autoGeneratedKeys);
        }

        @Override
        public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
            return delegate.prepareStatement(sql, columnIndexes);
        }

        @Override
        public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
            return delegate.prepareStatement(sql, columnNames);
        }

        @Override
        public Clob createClob() throws SQLException {
            return delegate.createClob();
        }

        @Override
        public Blob createBlob() throws SQLException {
            return delegate.createBlob();
        }

        @Override
        public NClob createNClob() throws SQLException {
            return delegate.createNClob();
        }

        @Override
        public SQLXML createSQLXML() throws SQLException {
            return delegate.createSQLXML();
        }

        @Override
        public boolean isValid(int timeout) throws SQLException {
            return delegate.isValid(timeout);
        }

        @Override
        public void setClientInfo(String name, String value) throws SQLClientInfoException {
            delegate.setClientInfo(name, value);
        }

        @Override
        public void setClientInfo(Properties properties) throws SQLClientInfoException {
            delegate.setClientInfo(properties);
        }

        @Override
        public String getClientInfo(String name) throws SQLException {
            return delegate.getClientInfo(name);
        }

        @Override
        public Properties getClientInfo() throws SQLException {
            return delegate.getClientInfo();
        }

        @Override
        public Array createArrayOf(String typeName, Object[] elements) throws SQLException {
            return delegate.createArrayOf(typeName, elements);
        }

        @Override
        public Struct createStruct(String typeName, Object[] attributes) throws SQLException {
            return delegate.createStruct(typeName, attributes);
        }

        @Override
        public void setSchema(String schema) throws SQLException {
            delegate.setSchema(schema);
        }

        @Override
        public String getSchema() throws SQLException {
            return delegate.getSchema();
        }

        @Override
        public void abort(Executor executor) throws SQLException {
            delegate.abort(executor);
        }

        @Override
        public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {
            delegate.setNetworkTimeout(executor, milliseconds);
        }

        @Override
        public int getNetworkTimeout() throws SQLException {
            return delegate.getNetworkTimeout();
        }

        @Override
        public  T unwrap(Class iface) throws SQLException {
            return delegate.unwrap(iface);
        }

        @Override
        public boolean isWrapperFor(Class iface) throws SQLException {
            return delegate.isWrapperFor(iface);
        }
    }
}