/*
* Copyright 1999-2015 dangdang.com.
* <p>
* 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.
* </p>
*/
package com.dangdang.ddframe.rdb.sharding.jdbc.adapter;
import com.dangdang.ddframe.rdb.sharding.jdbc.unsupported.AbstractUnsupportedOperationStatement;
import com.dangdang.ddframe.rdb.sharding.util.SQLUtil;
import com.dangdang.ddframe.rdb.sharding.util.ThrowableSQLExceptionMethod;
import lombok.RequiredArgsConstructor;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.Statement;
import java.util.Collection;
/**
* 静态语句对象适配类.
*
* @author gaohongtao
*/
@RequiredArgsConstructor
public abstract class AbstractStatementAdapter extends AbstractUnsupportedOperationStatement {
private final Class<? extends Statement> recordTargetClass;
private boolean closed;
private boolean poolable;
private int fetchSize;
protected abstract void clearRouteStatements();
@Override
@SuppressWarnings("unchecked")
public final void close() throws SQLException {
SQLUtil.safeInvoke(getRoutedStatements(), new ThrowableSQLExceptionMethod() {
@Override
public void apply(final Object object) throws SQLException {
((Statement) object).close();
}
});
closed = true;
clearRouteStatements();
}
@Override
public final boolean isClosed() throws SQLException {
return closed;
}
@Override
public final boolean isPoolable() throws SQLException {
return poolable;
}
@Override
public final void setPoolable(final boolean poolable) throws SQLException {
this.poolable = poolable;
if (getRoutedStatements().isEmpty()) {
recordMethodInvocation(recordTargetClass, "setPoolable", new Class[] {boolean.class}, new Object[] {poolable});
return;
}
for (Statement each : getRoutedStatements()) {
each.setPoolable(poolable);
}
}
@Override
public final int getFetchSize() throws SQLException {
return fetchSize;
}
@Override
public final void setFetchSize(final int rows) throws SQLException {
this.fetchSize = rows;
if (getRoutedStatements().isEmpty()) {
recordMethodInvocation(recordTargetClass, "setFetchSize", new Class[] {int.class}, new Object[] {rows});
return;
}
for (Statement each : getRoutedStatements()) {
each.setFetchSize(rows);
}
}
@Override
public final void setEscapeProcessing(final boolean enable) throws SQLException {
if (getRoutedStatements().isEmpty()) {
recordMethodInvocation(recordTargetClass, "setEscapeProcessing", new Class[] {boolean.class}, new Object[] {enable});
return;
}
for (Statement each : getRoutedStatements()) {
each.setEscapeProcessing(enable);
}
}
@Override
public final void cancel() throws SQLException {
for (Statement each : getRoutedStatements()) {
each.cancel();
}
}
@Override
public final void setCursorName(final String name) throws SQLException {
if (getRoutedStatements().isEmpty()) {
recordMethodInvocation(recordTargetClass, "setCursorName", new Class[] {String.class}, new Object[] {name});
return;
}
for (Statement each : getRoutedStatements()) {
each.setCursorName(name);
}
}
@Override
public final int getUpdateCount() throws SQLException {
long result = 0;
boolean hasResult = false;
for (Statement each : getRoutedStatements()) {
if (each.getUpdateCount() > -1) {
hasResult = true;
}
result += each.getUpdateCount();
}
if (result > Integer.MAX_VALUE) {
result = Integer.MAX_VALUE;
}
return hasResult ? Long.valueOf(result).intValue() : -1;
}
@Override
public SQLWarning getWarnings() throws SQLException {
return null;
}
@Override
public void clearWarnings() throws SQLException {
}
/*
* 只有存储过程会出现多结果集, 因此不支持.
*/
@Override
public final boolean getMoreResults() throws SQLException {
return false;
}
@Override
public final boolean getMoreResults(final int current) throws SQLException {
return false;
}
@Override
public final int getMaxFieldSize() throws SQLException {
return getRoutedStatements().isEmpty() ? 0 : getRoutedStatements().iterator().next().getMaxFieldSize();
}
@Override
public final void setMaxFieldSize(final int max) throws SQLException {
if (getRoutedStatements().isEmpty()) {
recordMethodInvocation(recordTargetClass, "setMaxFieldSize", new Class[] {int.class}, new Object[] {max});
return;
}
for (Statement each : getRoutedStatements()) {
each.setMaxFieldSize(max);
}
}
// TODO 未来需要确认MaxRows是否在多数据库情况下需要特殊处理,以满足校验需要. 如: 10个statement可能需要将MaxRows / 10
@Override
public final int getMaxRows() throws SQLException {
return getRoutedStatements().isEmpty() ? -1 : getRoutedStatements().iterator().next().getMaxRows();
}
@Override
public final void setMaxRows(final int max) throws SQLException {
if (getRoutedStatements().isEmpty()) {
recordMethodInvocation(recordTargetClass, "setMaxRows", new Class[] {int.class}, new Object[] {max});
return;
}
for (Statement each : getRoutedStatements()) {
each.setMaxRows(max);
}
}
@Override
public final int getQueryTimeout() throws SQLException {
return getRoutedStatements().isEmpty() ? 0 : getRoutedStatements().iterator().next().getQueryTimeout();
}
@Override
public final void setQueryTimeout(final int seconds) throws SQLException {
if (getRoutedStatements().isEmpty()) {
recordMethodInvocation(recordTargetClass, "setQueryTimeout", new Class[] {int.class}, new Object[] {seconds});
return;
}
for (Statement each : getRoutedStatements()) {
each.setQueryTimeout(seconds);
}
}
@Override
public ResultSet getGeneratedKeys() throws SQLException {
if (1 == getRoutedStatements().size()) {
return getRoutedStatements().iterator().next().getGeneratedKeys();
}
throw new IllegalStateException("Cannot call getGeneratedKeys if sharding statements more than 1.");
}
/**
* 获取路由的静态语句对象集合.
*
* @return 路由的静态语句对象集合
*/
protected abstract Collection<? extends Statement> getRoutedStatements();
}