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/**
* Copyright (c) 2013, impossibl.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of impossibl.com nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*-------------------------------------------------------------------------
*
* Copyright (c) 2004-2011, PostgreSQL Global Development Group
*
*
*-------------------------------------------------------------------------
*/
package com.impossibl.postgres.jdbc;
import com.impossibl.postgres.protocol.FieldFormatRef;
import com.impossibl.postgres.protocol.RequestExecutorHandlers;
import com.impossibl.postgres.protocol.RequestExecutorHandlers.AnyQueryResult;
import com.impossibl.postgres.protocol.RequestExecutorHandlers.CompositeQueryResults;
import com.impossibl.postgres.protocol.RequestExecutorHandlers.ExecuteResult;
import com.impossibl.postgres.protocol.RequestExecutorHandlers.QueryResult;
import com.impossibl.postgres.protocol.ResultBatch;
import com.impossibl.postgres.protocol.ResultField;
import static com.impossibl.postgres.jdbc.ErrorUtils.chainWarnings;
import static com.impossibl.postgres.jdbc.ErrorUtils.makeSQLException;
import static com.impossibl.postgres.protocol.ResultBatches.transformFieldTypes;
import static com.impossibl.postgres.utils.Nulls.firstNonNull;
import java.io.IOException;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.util.ArrayList;
import java.util.List;
import static java.util.Collections.singletonList;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import io.netty.buffer.ByteBuf;
public class DirectQuery implements Query {
private String sql;
private FieldFormatRef[] parameterFormats;
private ByteBuf[] parameterBuffers;
private FieldFormatRef[] resultFieldFormats;
private String portalName;
private Status status;
private Long timeout;
private int maxRows;
private List resultBatches;
private ResultField[] suspendedResultFields;
DirectQuery(String sql, FieldFormatRef[] parameterFormats, ByteBuf[] parameterBuffers, FieldFormatRef[] resultFieldFormats) {
this.sql = sql;
this.parameterFormats = parameterFormats;
this.parameterBuffers = parameterBuffers;
this.resultFieldFormats = resultFieldFormats;
this.status = Status.Initialized;
this.resultBatches = new ArrayList<>();
}
@Override
public Status getStatus() {
return status;
}
@Override
public Long getTimeout() {
return timeout;
}
@Override
public void setTimeout(Long timeout) {
this.timeout = timeout;
}
@Override
public void setMaxRows(int maxRows) {
this.maxRows = maxRows;
}
@Override
public List getResultBatches() {
return resultBatches;
}
private boolean requiresPortal() {
return maxRows > 0;
}
private boolean hasParameters() {
return parameterBuffers != null && parameterBuffers.length != 0;
}
private SQLWarning executeSimple(PGDirectConnection connection, String sql) throws SQLException {
portalName = null;
CompositeQueryResults results = connection.executeTimed(this.timeout, (timeout) -> {
CompositeQueryResults handler = new CompositeQueryResults();
connection.getRequestExecutor().query(sql, handler);
handler.await(timeout, MILLISECONDS);
return handler;
});
resultBatches = results.getBatches();
// Cache referenced types...
try {
for (ResultBatch resultBatch : resultBatches) {
transformFieldTypes(resultBatch, connection.getRegistry()::resolve);
}
}
catch (IOException e) {
throw makeSQLException(e);
}
return chainWarnings(null, results);
}
private SQLWarning executeExtended(PGDirectConnection connection, String sql) throws SQLException {
if (requiresPortal()) {
portalName = connection.getNextPortalName();
}
else {
portalName = null;
}
QueryResult result = connection.executeTimed(this.timeout, (timeout) -> {
QueryResult handler = new QueryResult(!requiresPortal());
connection.getRequestExecutor().query(sql, portalName, parameterFormats, parameterBuffers, resultFieldFormats, maxRows, handler);
handler.await(timeout, MILLISECONDS);
return handler;
});
if (result.isSuspended()) {
suspendedResultFields = result.getBatch().getFields();
}
return applyExecuteResult(connection, result);
}
private SQLWarning resumeExtended(PGDirectConnection connection) throws SQLException {
ExecuteResult result = connection.executeTimed(this.timeout, (timeout) -> {
ExecuteResult handler = new ExecuteResult(false, suspendedResultFields);
connection.getRequestExecutor().resume(portalName, firstNonNull(maxRows, 0), handler);
handler.await(timeout, MILLISECONDS);
return handler;
});
return applyExecuteResult(connection, result);
}
private SQLWarning applyExecuteResult(PGDirectConnection connection, AnyQueryResult result) throws SQLException {
ResultBatch resultBatch = result.getBatch();
// Cache referenced types...
try {
transformFieldTypes(resultBatch, connection.getRegistry()::resolve);
}
catch (IOException e) {
throw makeSQLException(e);
}
resultBatches = new ArrayList<>(singletonList(resultBatch));
if (result.isSuspended()) {
status = Status.Suspended;
}
else if (portalName != null) {
dispose(connection);
}
return chainWarnings(null, result);
}
@Override
public SQLWarning execute(PGDirectConnection connection) throws SQLException {
boolean wasSuspended = status == Status.Suspended;
status = Status.InProgress;
try {
if (wasSuspended) {
if (portalName == null) {
throw new PGSQLSimpleException("Illegal query state - suspended with no portal");
}
if (suspendedResultFields == null) {
throw new PGSQLSimpleException("Illegal query state - suspended with no previous results");
}
return resumeExtended(connection);
}
if (requiresPortal() || hasParameters()) {
return executeExtended(connection, sql);
}
else {
return executeSimple(connection, sql);
}
}
finally {
if (status == Status.InProgress) {
status = Status.Completed;
}
}
}
@Override
public void dispose(PGDirectConnection connection) throws SQLException {
if (portalName != null) {
connection.execute((timeout) -> {
RequestExecutorHandlers.SynchronizedResult finish = new RequestExecutorHandlers.SynchronizedResult();
connection.getRequestExecutor().finish(portalName, finish);
finish.await(timeout, MILLISECONDS);
});
}
portalName = null;
}
@Override
public String toString() {
return "DirectQuery{" +
"sql='" + sql + '\'' +
", portalName='" + portalName + '\'' +
", status=" + status +
'}';
}
}