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HsqlDbTrigger.java
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HsqlDbTrigger.java
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/*
* SymmetricDS is an open source database synchronization solution.
*
* Copyright (C) Chris Henson <chenson42@users.sourceforge.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*/
package org.jumpmind.symmetric.db.hsqldb;
import java.util.Date;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.lang.RandomStringUtils;
import org.apache.commons.lang.StringUtils;
import org.hsqldb.Token;
import org.hsqldb.types.Binary;
import org.jumpmind.symmetric.common.logging.Log;
import org.jumpmind.symmetric.common.logging.LogFactory;
import org.jumpmind.symmetric.model.Data;
import org.jumpmind.symmetric.model.DataEventType;
public class HsqlDbTrigger extends AbstractEmbeddedTrigger implements org.hsqldb.Trigger {
static final Log logger = LogFactory.getLog(HsqlDbTrigger.class);
String triggerName;
String dataSelectSql;
String transactionIdSql;
boolean conditionalExists;
static String transactionId;
static long lastTransactionIdUpdate;
boolean initialized = false;
public void fire(int type, String triggerName, String tableName, Object[] oldRow, Object[] newRow) {
try {
init(type, triggerName, tableName);
if (initialized) {
HsqlDbDialect dialect = getDbDialect();
if (trigger.isSyncOnIncomingBatch() || dialect.isSyncEnabled() && isInsertDataEvent(oldRow, newRow)) {
Data data = createData(oldRow, newRow);
dataService.insertData(data);
}
}
} catch (RuntimeException ex) {
logger.error(ex);
throw ex;
} finally {
lastTransactionIdUpdate = System.currentTimeMillis();
}
}
protected Data createData(Object[] oldRow, Object[] newRow) {
Data data = new Data(StringUtils.isBlank(trigger.getTargetTableName()) ? tableName : trigger
.getTargetTableName(), triggerType, formatRowData(oldRow, newRow), formatPkRowData(oldRow, newRow),
triggerHistory, trigger.getChannelId(), getTransactionId(oldRow, newRow), getDbDialect()
.getSyncNodeDisabled());
if (triggerType == DataEventType.UPDATE && trigger.isSyncColumnLevel()) {
data.setOldData(formatAsCsv(getOrderedColumnValues(oldRow)));
}
return data;
}
private boolean isInsertDataEvent(Object[] oldRow, Object[] newRow) {
if (conditionalExists) {
return getDbDialect().getJdbcTemplate().queryForInt(fillVirtualTableSql(dataSelectSql, oldRow, newRow)) > 0;
} else {
return true;
}
}
private void init(int type, String triggerName, String tableName) {
if (!initialized) {
this.triggerName = triggerName;
if (initialize(getDataEventType(type), tableName)) {
buildDataSelectSql();
buildTransactionIdSql();
logger.debug("TriggerInitializing", triggerName, triggerType);
initialized = true;
}
}
}
private String buildVirtualTableSql() {
StringBuilder b = new StringBuilder("(select ");
for (String column : includedColumns) {
b.append("? as ");
if (Token.isKeyword(column) || column.indexOf(" ") != -1) {
b.append("\"new_").append(column).append("\",");
} else {
b.append("new_").append(column).append(",");
}
}
for (String column : includedColumns) {
b.append("? as ");
if (Token.isKeyword(column) || column.indexOf(" ") != -1) {
b.append("\"old_").append(column).append("\",");
} else {
b.append("old_").append(column).append(",");
}
}
b.deleteCharAt(b.length() - 1);
b.append(" from " + HsqlDbDialect.DUAL_TABLE + ") t ");
return b.toString();
}
private void buildTransactionIdSql() {
if (!StringUtils.isBlank(trigger.getTxIdExpression())) {
transactionIdSql = "select " + replaceOldNewTriggerTokens(trigger.getTxIdExpression()) + " from "
+ buildVirtualTableSql();
}
}
/**
* I wanted to do this as a preparedstatement but hsqldb doesn't seem to
* support it.
*/
private String fillVirtualTableSql(String sql, Object[] oldRow, Object[] newRow) {
Object[] values = ArrayUtils.addAll(getOrderedColumnValues(newRow), getOrderedColumnValues(oldRow));
StringBuilder out = new StringBuilder();
String[] tokens = StringUtils.split(sql, "?");
for (int i = 0; i < tokens.length; i++) {
out.append(tokens[i]);
if (i < values.length) {
Object value = values[i];
if (value instanceof String) {
out.append("'");
out.append(escapeString(value));
out.append("'");
} else if (value instanceof Number) {
out.append(value);
} else if (value instanceof Date) {
out.append("'");
out.append(AbstractEmbeddedTrigger.dateFormatter.format(value));
out.append("'");
} else {
// anything else is unsupported
out.append("null");
}
}
}
return out.toString();
}
protected String escapeString(Object val) {
return val == null ? null : val.toString().replaceAll("'", "''");
}
private void buildDataSelectSql() {
StringBuilder b = new StringBuilder("select count(*) from ");
b.append(buildVirtualTableSql());
switch (triggerType) {
case INSERT:
if (!StringUtils.isBlank(trigger.getSyncOnInsertCondition())) {
conditionalExists = true;
b.append("where ");
b.append(trigger.getSyncOnInsertCondition());
}
break;
case UPDATE:
if (!StringUtils.isBlank(trigger.getSyncOnUpdateCondition())) {
conditionalExists = true;
b.append("where ");
b.append(trigger.getSyncOnUpdateCondition());
}
break;
case DELETE:
if (!StringUtils.isBlank(trigger.getSyncOnDeleteCondition())) {
conditionalExists = true;
b.append("where ");
b.append(trigger.getSyncOnDeleteCondition());
}
break;
}
this.dataSelectSql = replaceOldNewTriggerTokens(b.toString());
}
private String replaceOldNewTriggerTokens(String targetString) {
// This is a little hack to allow us to replace not only the old/new
// alias's, but also the column prefix for
// use in a virtual table we can match SQL expressions against.
targetString = StringUtils.replace(targetString, "$(newTriggerValue).", "$(newTriggerValue)");
targetString = StringUtils.replace(targetString, "$(oldTriggerValue).", "$(oldTriggerValue)");
targetString = StringUtils.replace(targetString, "$(curTriggerValue).", "$(curTriggerValue)");
return dbDialect.replaceTemplateVariables(triggerType, trigger, triggerHistory, targetString);
}
private DataEventType getDataEventType(int type) {
switch (type) {
case org.hsqldb.Trigger.INSERT_AFTER_ROW:
return DataEventType.INSERT;
case org.hsqldb.Trigger.UPDATE_AFTER_ROW:
return DataEventType.UPDATE;
case org.hsqldb.Trigger.DELETE_AFTER_ROW:
return DataEventType.DELETE;
default:
throw new IllegalStateException("Unexpected trigger type: " + type);
}
}
private HsqlDbDialect getDbDialect() {
return (HsqlDbDialect) dbDialect;
}
@Override
protected String getEngineName() {
String minusTriggerId = triggerName.substring(0, triggerName.lastIndexOf("_"));
return minusTriggerId.substring(minusTriggerId.lastIndexOf("_") + 1);
}
@Override
protected int getTriggerHistId() {
return Integer.parseInt(triggerName.substring(triggerName.lastIndexOf("_") + 1));
}
@Override
protected boolean toCsv(Object object, StringBuilder b) {
boolean handled = true;
if (object instanceof Binary) {
b.append("\"");
Binary d = (Binary) object;
b.append(new String(Base64.encodeBase64(d.getBytes())));
b.append("\"");
} else {
handled = super.toCsv(object, b);
}
return handled;
}
protected String getTransactionId(Object[] oldRow, Object[] newRow) {
if (System.currentTimeMillis() - lastTransactionIdUpdate > 5000) {
transactionId = RandomStringUtils.randomAlphanumeric(12);
}
if (transactionIdSql != null) {
transactionId = (String) getDbDialect().getJdbcTemplate().queryForObject(
fillVirtualTableSql(transactionIdSql, oldRow, newRow), String.class);
}
return transactionId;
}
}