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Code Issues Releases Wiki Activity

Memory management optimisation: help garbage collection by avoiding repeated instantiations of immutable arrays (empty arrays of String, Message, Flag, Address)

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This commit is contained in:
Fiouz 2010-08-07 15:10:07 +00:00
parent b4566ef640
commit dfb8f9e0f2
6 changed files with 30 additions and 16 deletions
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4
src/com/fsck/k9/mail/Address.java
View File

@ -115,7 +115,7 @@ public class Address
if (addressList == null
&& !"".equals(addressList))
{
return new Address[] {};
return EMPTY_ADDRESS_ARRAY;
}
try
{
@ -145,7 +145,7 @@ public class Address
catch (ParseException pe)
{
}
return addresses.toArray(new Address[] {});
return addresses.toArray(EMPTY_ADDRESS_ARRAY);
}
@Override

4
src/com/fsck/k9/mail/Message.java
View File

@ -8,6 +8,8 @@ import com.fsck.k9.activity.MessageReference;
public abstract class Message implements Part, Body
{
private static final Flag[] EMPTY_FLAG_ARRAY = new Flag[0];
private MessageReference mReference = null;
public enum RecipientType
@ -156,7 +158,7 @@ public abstract class Message implements Part, Body
*/
public Flag[] getFlags()
{
return mFlags.toArray(new Flag[] {});
return mFlags.toArray(EMPTY_FLAG_ARRAY);
}
public void setFlag(Flag flag, boolean set) throws MessagingException

4
src/com/fsck/k9/mail/internet/MimeHeader.java
View File

@ -13,6 +13,8 @@ import java.util.*;
public class MimeHeader
{
private static final String[] EMPTY_STRING_ARRAY = new String[0];
/**
* Application specific header that contains Store specific information about an attachment.
* In IMAP this contains the IMAP BODYSTRUCTURE part id so that the ImapStore can later
@ -93,7 +95,7 @@ public class MimeHeader
{
return null;
}
return values.toArray(new String[] {});
return values.toArray(EMPTY_STRING_ARRAY);
}
public void removeHeader(String name)

10
src/com/fsck/k9/mail/store/ImapStore.java
View File

@ -83,6 +83,10 @@ public class ImapStore extends Store
private static final String CAPABILITY_COMPRESS_DEFLATE = "COMPRESS=DEFLATE";
private static final String COMMAND_COMPRESS_DEFLATE = "COMPRESS DEFLATE";
private static final Message[] EMPTY_MESSAGE_ARRAY = new Message[0];
private static final String[] EMPTY_STRING_ARRAY = new String[0];
private String mHost;
private int mPort;
private String mUsername;
@ -1091,7 +1095,7 @@ public class ImapStore extends Store
{
throw ioExceptionHandler(mConnection, ioe);
}
return messages.toArray(new Message[] {});
return messages.toArray(EMPTY_MESSAGE_ARRAY);
}
@ -1123,7 +1127,7 @@ public class ImapStore extends Store
}
}
}
uids = tempUids.toArray(new String[] {});
uids = tempUids.toArray(EMPTY_STRING_ARRAY);
}
for (int i = 0, count = uids.length; i < count; i++)
{
@ -1143,7 +1147,7 @@ public class ImapStore extends Store
{
throw ioExceptionHandler(mConnection, ioe);
}
return messages.toArray(new Message[] {});
return messages.toArray(EMPTY_MESSAGE_ARRAY);
}
@Override

8
src/com/fsck/k9/mail/store/LocalStore.java
View File

@ -37,6 +37,8 @@ import java.util.regex.Matcher;
public class LocalStore extends Store implements Serializable
{
private static final Message[] EMPTY_MESSAGE_ARRAY = new Message[0];
/**
* Immutable empty {@link String} array
*/
@ -805,7 +807,7 @@ public class LocalStore extends Store implements Serializable
}
}
return messages.toArray(new Message[] {});
return messages.toArray(EMPTY_MESSAGE_ARRAY);
}
@ -1498,7 +1500,7 @@ public class LocalStore extends Store implements Serializable
cursor = mDb.rawQuery(
"SELECT message_id, name, value FROM headers " + "WHERE message_id in ( " + questions + ") ",
ids.toArray(new String[] {}));
ids.toArray(EMPTY_STRING_ARRAY));
while (cursor.moveToNext())
@ -1596,7 +1598,7 @@ public class LocalStore extends Store implements Serializable
messages.add(message);
}
}
return messages.toArray(new Message[] {});
return messages.toArray(EMPTY_MESSAGE_ARRAY);
}
@Override

16
src/com/fsck/k9/mail/store/WebDavStore.java
View File

@ -73,6 +73,10 @@ public class WebDavStore extends Store
private static final Flag[] PERMANENT_FLAGS = { Flag.DELETED, Flag.SEEN, Flag.ANSWERED };
private static final String[] EMPTY_STRING_ARRAY = new String[0];
private static final Message[] EMPTY_MESSAGE_ARRAY = new Message[0];
private int mConnectionSecurity;
private String mUsername; /* Stores the username for authentications */
private String alias;
@ -1448,7 +1452,7 @@ public class WebDavStore extends Store
}
}
return messages.toArray(new Message[] {});
return messages.toArray(EMPTY_MESSAGE_ARRAY);
}
@ -1467,7 +1471,7 @@ public class WebDavStore extends Store
if (uids == null ||
uids.length == 0)
{
return messageList.toArray(new Message[] {});
return messageList.toArray(EMPTY_MESSAGE_ARRAY);
}
for (int i = 0, count = uids.length; i < count; i++)
@ -1485,7 +1489,7 @@ public class WebDavStore extends Store
listener.messageFinished(message, i, count);
}
}
messages = messageList.toArray(new Message[] {});
messages = messageList.toArray(EMPTY_MESSAGE_ARRAY);
return messages;
}
@ -2298,7 +2302,7 @@ public class WebDavStore extends Store
public String[] getHeaderList()
{
return this.mHeaders.toArray(new String[] {});
return this.mHeaders.toArray(EMPTY_STRING_ARRAY);
}
public void setReadStatus(boolean status)
@ -2430,7 +2434,7 @@ public class WebDavStore extends Store
hrefs.add(href);
}
return hrefs.toArray(new String[] {});
return hrefs.toArray(EMPTY_STRING_ARRAY);
}
/**
@ -2445,7 +2449,7 @@ public class WebDavStore extends Store
uids.add(uid);
}
return uids.toArray(new String[] {});
return uids.toArray(EMPTY_STRING_ARRAY);
}
/**