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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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 com.android.email.mail.transport;
import com.android.emailcommon.Logging;
import com.android.mail.utils.LogUtils;
import java.util.ArrayList;
/**
* A class to keep last N of lines sent to the server and responses received from the server.
* They are sent to logcat when {@link #logLastDiscourse} is called.
*
* <p>This class is used to log the recent network activities when a response parser crashes.
*/
public class DiscourseLogger {
private final int mBufferSize;
private String[] mBuffer;
private int mPos;
private final StringBuilder mReceivingLine = new StringBuilder(100);
public DiscourseLogger(int bufferSize) {
mBufferSize = bufferSize;
initBuffer();
}
private void initBuffer() {
mBuffer = new String[mBufferSize];
}
/** Add a single line to {@link #mBuffer}. */
private void addLine(String s) {
mBuffer[mPos] = s;
mPos++;
if (mPos >= mBufferSize) {
mPos = 0;
}
}
private void addReceivingLineToBuffer() {
if (mReceivingLine.length() > 0) {
addLine(mReceivingLine.toString());
mReceivingLine.delete(0, Integer.MAX_VALUE);
}
}
/**
* Store a single byte received from the server in {@link #mReceivingLine}. When LF is
* received, the content of {@link #mReceivingLine} is added to {@link #mBuffer}.
*/
public void addReceivedByte(int b) {
if (0x20 <= b && b <= 0x7e) { // Append only printable ASCII chars.
mReceivingLine.append((char) b);
} else if (b == '\n') { // LF
addReceivingLineToBuffer();
} else if (b == '\r') { // CR
} else {
final String hex = "00" + Integer.toHexString(b);
mReceivingLine.append("\\x" + hex.substring(hex.length() - 2, hex.length()));
}
}
/** Add a line sent to the server to {@link #mBuffer}. */
public void addSentCommand(String command) {
addLine(command);
}
/** @return the contents of {@link #mBuffer} as a String array. */
/* package for testing */ String[] getLines() {
addReceivingLineToBuffer();
ArrayList<String> list = new ArrayList<String>();
final int start = mPos;
int pos = mPos;
do {
String s = mBuffer[pos];
if (s != null) {
list.add(s);
}
pos = (pos + 1) % mBufferSize;
} while (pos != start);
String[] ret = new String[list.size()];
list.toArray(ret);
return ret;
}
/**
* Log the contents of the {@link mBuffer}, and clears it out. (So it's okay to call this
* method successively more than once. There will be no duplicate log.)
*/
public void logLastDiscourse() {
String[] lines = getLines();
if (lines.length == 0) {
return;
}
LogUtils.w(Logging.LOG_TAG, "Last network activities:");
for (String r : getLines()) {
LogUtils.w(Logging.LOG_TAG, "%s", r);
}
initBuffer();
}
}
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