/*
* Copyright 2004-2015 the Seasar Foundation and the Others.
*
* 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 org.seasar.framework.aop.interceptors;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.seasar.framework.log.Logger;
import org.seasar.framework.util.ArrayUtil;
/**
* トレース出力用の{@link MethodInterceptor}です。
*
* @author higa
*
*/
public class TraceInterceptor extends AbstractInterceptor {
private static final long serialVersionUID = -8142348754572405060L;
private static final Logger logger = Logger
.getLogger(TraceInterceptor.class);
/**
* コレクションの最大サイズです。
*/
protected int maxLengthOfCollection = 10;
/**
* 引数や戻り値が{@link Collection}や配列だった場合Max何件出力するかどうか設定します。
*
* @param maxLengthOfCollection
*/
public void setMaxLengthOfCollection(final int maxLengthOfCollection) {
this.maxLengthOfCollection = maxLengthOfCollection;
}
public Object invoke(final MethodInvocation invocation) throws Throwable {
if (!logger.isDebugEnabled()) {
return invocation.proceed();
}
final StringBuffer buf = new StringBuffer(100);
buf.append(getTargetClass(invocation).getName());
buf.append("#").append(invocation.getMethod().getName()).append("(");
final Object[] args = invocation.getArguments();
if (args != null && args.length > 0) {
for (int i = 0; i < args.length; ++i) {
appendObject(buf, args[i]).append(", ");
}
buf.setLength(buf.length() - 2);
}
buf.append(")");
Object ret = null;
Throwable cause = null;
logger.debug("BEGIN " + buf);
try {
ret = invocation.proceed();
buf.append(" : ");
appendObject(buf, ret);
} catch (final Throwable t) {
buf.append(" Throwable:").append(t);
cause = t;
}
logger.debug("END " + buf);
if (cause == null) {
return ret;
}
throw cause;
}
/**
* オブジェクトのトレース情報を追加します。
*
* @param buf
* バッファ
* @param arg
* オブジェクト
* @return 結果のバッファ
*/
protected StringBuffer appendObject(final StringBuffer buf, final Object arg) {
if (arg == null) {
buf.append("null");
} else if (arg.getClass().isArray()) {
if (arg.getClass().getComponentType().isPrimitive()) {
appendList(buf, Arrays.asList(ArrayUtil.toObjectArray(arg)));
} else {
appendList(buf, Arrays.asList((Object[]) arg));
}
} else if (arg instanceof Collection) {
appendList(buf, (Collection) arg);
} else {
buf.append(arg);
}
return buf;
}
/**
* コレクションのトレース情報を追加します。
*
* @param buf
* バッファ
* @param collection
* コレクション
* @return 結果のバッファ
*/
protected StringBuffer appendList(final StringBuffer buf,
final Collection collection) {
buf.append("[");
int count = 0;
for (final Iterator it = collection.iterator(); it.hasNext()
&& count < maxLengthOfCollection; ++count) {
appendObject(buf, it.next()).append(", ");
}
if (count > 0) {
buf.setLength(buf.length() - 2);
}
buf.append("]");
return buf;
}
}