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Always send as many messages native->JS in one payload as possible.

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This commit is contained in:
Andrew Grieve 2012-09-11 14:35:39 -04:00
parent 4c9a571106
commit f53161d6f5
3 changed files with 45 additions and 35 deletions
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1
framework/src/org/apache/cordova/CallbackServer.java
View File

@ -214,7 +214,6 @@ public class CallbackServer implements Runnable {
synchronized (this) {
while (this.active) {
if (jsMessageQueue != null) {
// TODO(agrieve): Should this use popAll() instead?
payload = jsMessageQueue.popAndEncode();
if (payload != null) {
break;

2
framework/src/org/apache/cordova/ExposedJsApi.java
View File

@ -41,7 +41,6 @@ import org.json.JSONException;
jsMessageQueue.setPaused(true);
try {
pluginManager.exec(service, action, callbackId, arguments, true /* async */);
// TODO(agrieve): Should this use popAll() instead?
return jsMessageQueue.popAndEncode();
} finally {
jsMessageQueue.setPaused(false);
@ -53,7 +52,6 @@ import org.json.JSONException;
}
public String retrieveJsMessages() {
// TODO(agrieve): Should this use popAll() instead?
return jsMessageQueue.popAndEncode();
}
}

77
framework/src/org/apache/cordova/NativeToJsMessageQueue.java
View File

@ -24,7 +24,6 @@ import java.util.LinkedList;
import org.apache.cordova.api.CordovaInterface;
import org.apache.cordova.api.PluginResult;
import org.json.JSONObject;
import android.os.Message;
import android.util.Log;
@ -43,6 +42,9 @@ public class NativeToJsMessageQueue {
// JS instead of the custom format (useful for benchmarking).
private static final boolean FORCE_ENCODE_USING_EVAL = false;
// Arbitrarily chosen upper limit for how much data to send to JS in one shot.
private static final int MAX_PAYLOAD_SIZE = 50 * 1024;
/**
* The index into registeredListeners to treat as active.
*/
@ -121,58 +123,67 @@ public class NativeToJsMessageQueue {
message.encodeAsMessage(sb);
}
/**
* Combines and returns queued messages combined into a single string.
* Combines as many messages as possible, while staying under MAX_PAYLOAD_SIZE.
* Returns null if the queue is empty.
*/
public String popAndEncode() {
synchronized (this) {
if (queue.isEmpty()) {
return null;
}
JsMessage message = queue.removeFirst();
StringBuilder sb = new StringBuilder(calculatePackedMessageLength(message));
packMessage(message, sb);
return sb.toString();
}
}
/**
* Combines and returns all messages combined into a single string.
* Clears the queue.
* Returns null if the queue is empty.
*/
public String popAllAndEncode() {
synchronized (this) {
if (queue.isEmpty()) {
return null;
}
int totalPayloadLen = 0;
int numMessagesToSend = 0;
for (JsMessage message : queue) {
totalPayloadLen += calculatePackedMessageLength(message);
int messageSize = calculatePackedMessageLength(message);
if (numMessagesToSend > 0 && totalPayloadLen + messageSize > MAX_PAYLOAD_SIZE) {
break;
}
totalPayloadLen += messageSize;
numMessagesToSend += 1;
}
StringBuilder sb = new StringBuilder(totalPayloadLen);
for (JsMessage message : queue) {
for (int i = 0; i < numMessagesToSend; ++i) {
JsMessage message = queue.removeFirst();
packMessage(message, sb);
}
queue.clear();
if (!queue.isEmpty()) {
// Attach a char to indicate that there are more messages pending.
sb.append('*');
}
return sb.toString();
}
}
private String popAllAndEncodeAsJs() {
/**
* Same as popAndEncode(), except encodes in a form that can be executed as JS.
*/
private String popAndEncodeAsJs() {
synchronized (this) {
int length = queue.size();
if (length == 0) {
return null;
}
int totalPayloadLen = 16 * length; // accounts for try & finally.
int totalPayloadLen = 0;
int numMessagesToSend = 0;
for (JsMessage message : queue) {
totalPayloadLen += message.calculateEncodedLength(); // overestimate.
int messageSize = message.calculateEncodedLength() + 50; // overestimate.
if (numMessagesToSend > 0 && totalPayloadLen + messageSize > MAX_PAYLOAD_SIZE) {
break;
}
totalPayloadLen += messageSize;
numMessagesToSend += 1;
}
StringBuilder sb = new StringBuilder(totalPayloadLen);
boolean willSendAllMessages = numMessagesToSend == queue.size();
StringBuilder sb = new StringBuilder(totalPayloadLen + (willSendAllMessages ? 0 : 100));
// Wrap each statement in a try/finally so that if one throws it does
// not affect the next.
int i = 0;
for (JsMessage message : queue) {
if (++i == length) {
for (int i = 0; i < numMessagesToSend; ++i) {
JsMessage message = queue.removeFirst();
if (willSendAllMessages && (i + 1 == numMessagesToSend)) {
message.encodeAsJsMessage(sb);
} else {
sb.append("try{");
@ -180,10 +191,12 @@ public class NativeToJsMessageQueue {
sb.append("}finally{");
}
}
for ( i = 1; i < length; ++i) {
if (!willSendAllMessages) {
sb.append("window.setTimeout(function(){cordova.require('cordova/plugin/android/polling').pollOnce();},0);");
}
for (int i = willSendAllMessages ? 1 : 0; i < numMessagesToSend; ++i) {
sb.append('}');
}
queue.clear();
return sb.toString();
}
}
@ -262,7 +275,7 @@ public class NativeToJsMessageQueue {
private class LoadUrlBridgeMode implements BridgeMode {
final Runnable runnable = new Runnable() {
public void run() {
String js = popAllAndEncodeAsJs();
String js = popAndEncodeAsJs();
if (js != null) {
webView.loadUrlNow("javascript:" + js);
}
@ -344,7 +357,7 @@ public class NativeToJsMessageQueue {
}
// webViewCore is lazily initialized, and so may not be available right away.
if (sendMessageMethod != null) {
String js = popAllAndEncodeAsJs();
String js = popAndEncodeAsJs();
Message execJsMessage = Message.obtain(null, EXECUTE_JS, js);
try {
sendMessageMethod.invoke(webViewCore, execJsMessage);