From 5645f9ba10e87d067e52a079dbcf14716a01c146 Mon Sep 17 00:00:00 2001
From: Manfred Karrer <mk@nucleo.io>
Date: Mon, 1 Dec 2014 02:57:23 +0100
Subject: [PATCH]  Add isOnline check at take offer screen #313, fix #315

---
 .../trade/createoffer/CreateOfferView.java    |  4 +-
 .../trade/takeoffer/TakeOfferDataModel.java   | 66 ++++++++++++++++++-
 .../main/trade/takeoffer/TakeOfferView.fxml   | 19 +++++-
 .../main/trade/takeoffer/TakeOfferView.java   | 36 +++++++---
 .../trade/takeoffer/TakeOfferViewModel.java   |  9 ++-
 .../java/io/bitsquare/trade/TradeManager.java | 23 ++++++-
 .../RespondToIsOfferAvailableMessage.java     | 42 ++++++++++++
 .../offerer/tasks/HandleTakeOfferRequest.java |  8 +--
 .../RequestIsOfferAvailableMessage.java       | 39 +++++++++++
 .../resources/i18n/displayStrings.properties  |  1 +
 10 files changed, 225 insertions(+), 22 deletions(-)
 create mode 100644 src/main/java/io/bitsquare/trade/protocol/trade/offerer/messages/RespondToIsOfferAvailableMessage.java
 create mode 100644 src/main/java/io/bitsquare/trade/protocol/trade/taker/messages/RequestIsOfferAvailableMessage.java

diff --git a/src/main/java/io/bitsquare/gui/main/trade/createoffer/CreateOfferView.java b/src/main/java/io/bitsquare/gui/main/trade/createoffer/CreateOfferView.java
index 47ced99999..f162f1a039 100644
--- a/src/main/java/io/bitsquare/gui/main/trade/createoffer/CreateOfferView.java
+++ b/src/main/java/io/bitsquare/gui/main/trade/createoffer/CreateOfferView.java
@@ -234,8 +234,10 @@ public class CreateOfferView extends ActivatableViewAndModel<AnchorPane, CreateO
 
     private void close() {
         TabPane tabPane = ((TabPane) (root.getParent().getParent()));
-        tabPane.getTabs().remove(tabPane.getSelectionModel().getSelectedItem());
 
+        // Might fix #315  Offerbook tab gets closed 
+        // tabPane.getTabs().remove(tabPane.getSelectionModel().getSelectedItem());
+        tabPane.getTabs().remove(1);
         navigation.navigateTo(MainView.class, PortfolioView.class, OffersView.class);
     }
 
diff --git a/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferDataModel.java b/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferDataModel.java
index 590fc0350a..beed69d20e 100644
--- a/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferDataModel.java
+++ b/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferDataModel.java
@@ -21,11 +21,16 @@ import io.bitsquare.btc.AddressEntry;
 import io.bitsquare.btc.FeePolicy;
 import io.bitsquare.btc.WalletService;
 import io.bitsquare.btc.listeners.BalanceListener;
+import io.bitsquare.msg.MessageService;
+import io.bitsquare.msg.listeners.GetPeerAddressListener;
+import io.bitsquare.msg.listeners.OutgoingMessageListener;
+import io.bitsquare.network.Peer;
 import io.bitsquare.offer.Offer;
 import io.bitsquare.persistence.Persistence;
 import io.bitsquare.settings.Preferences;
 import io.bitsquare.trade.Trade;
 import io.bitsquare.trade.TradeManager;
+import io.bitsquare.trade.protocol.trade.taker.messages.RequestIsOfferAvailableMessage;
 
 import org.bitcoinj.core.Coin;
 import org.bitcoinj.utils.ExchangeRate;
@@ -56,8 +61,15 @@ import org.slf4j.LoggerFactory;
 class TakeOfferDataModel implements Activatable, DataModel {
     private static final Logger log = LoggerFactory.getLogger(TakeOfferDataModel.class);
 
+    enum OfferAvailableState {
+        UNKNOWN,
+        OFFER_NOT_AVAILABLE,
+        OFFER_AVAILABLE
+    }
+
     private final TradeManager tradeManager;
     private final WalletService walletService;
+    private MessageService messageService;
     private final Preferences preferences;
     private final Persistence persistence;
 
@@ -79,12 +91,19 @@ class TakeOfferDataModel implements Activatable, DataModel {
     final ObjectProperty<Coin> offerFeeAsCoin = new SimpleObjectProperty<>();
     final ObjectProperty<Coin> networkFeeAsCoin = new SimpleObjectProperty<>();
 
+    final ObjectProperty<OfferAvailableState> offerIsAvailable = new SimpleObjectProperty<>(OfferAvailableState
+            .UNKNOWN);
+
+    // 
+    private boolean isActivated;
 
     @Inject
-    public TakeOfferDataModel(TradeManager tradeManager, WalletService walletService, Preferences preferences,
+    public TakeOfferDataModel(TradeManager tradeManager, WalletService walletService, MessageService messageService,
+                              Preferences preferences,
                               Persistence persistence) {
         this.tradeManager = tradeManager;
         this.walletService = walletService;
+        this.messageService = messageService;
         this.preferences = preferences;
         this.persistence = persistence;
 
@@ -94,11 +113,13 @@ class TakeOfferDataModel implements Activatable, DataModel {
 
     @Override
     public void activate() {
+        isActivated = true;
         btcCode.bind(preferences.btcDenominationProperty());
     }
 
     @Override
     public void deactivate() {
+        isActivated = false;
         btcCode.unbind();
     }
 
@@ -126,8 +147,50 @@ class TakeOfferDataModel implements Activatable, DataModel {
             }
         });
         updateBalance(walletService.getBalanceForAddress(addressEntry.getAddress()));
+
+        getPeerAddress(offer);
     }
 
+    // TODO: Should be moved to a domain and handled with add/remove listeners instead of isActivated
+    // or maybe with rx?
+    private void getPeerAddress(Offer offer) {
+        messageService.getPeerAddress(offer.getMessagePublicKey(), new GetPeerAddressListener() {
+            @Override
+            public void onResult(Peer peer) {
+                if (isActivated)
+                    isOfferAvailable(peer, offer.getId());
+            }
+
+            @Override
+            public void onFailed() {
+                if (isActivated)
+                    log.error("The offerers address have not been found. That should never happen.");
+            }
+        });
+    }
+
+    private void isOfferAvailable(Peer peer, String offerId) {
+        messageService.sendMessage(peer, new RequestIsOfferAvailableMessage(offerId),
+                new OutgoingMessageListener() {
+                    @Override
+                    public void onResult() {
+                        if (isActivated) {
+                            log.trace("RequestIsOfferAvailableMessage successfully arrived at peer");
+                            offerIsAvailable.set(OfferAvailableState.OFFER_AVAILABLE);
+                        }
+                    }
+
+                    @Override
+                    public void onFailed() {
+                        if (isActivated) {
+                            log.error("RequestIsOfferAvailableMessage  did not arrive at peer");
+                            offerIsAvailable.set(OfferAvailableState.OFFER_NOT_AVAILABLE);
+                        }
+                    }
+                });
+    }
+
+
     void takeOffer() {
         final Trade trade = tradeManager.takeOffer(amountAsCoin.get(), offer);
         trade.stateProperty().addListener((ov, oldValue, newValue) -> {
@@ -214,7 +277,6 @@ class TakeOfferDataModel implements Activatable, DataModel {
     }
 
 
-
     WalletService getWalletService() {
         return walletService;
     }
diff --git a/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferView.fxml b/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferView.fxml
index 86732a5f01..3761c9e678 100644
--- a/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferView.fxml
+++ b/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferView.fxml
@@ -61,7 +61,8 @@
                 </Label>
             </VBox>
 
-            <HBox GridPane.columnIndex="1" alignment="CENTER_LEFT" spacing="5">
+            <HBox GridPane.columnIndex="1" alignment="CENTER_LEFT" spacing="5"
+                    >
                 <GridPane.margin>
                     <Insets right="10.0" top="20.0"/>
                 </GridPane.margin>
@@ -108,7 +109,8 @@
                 </VBox>
             </HBox>
 
-            <VBox GridPane.columnIndex="1" GridPane.rowIndex="1" spacing="4">
+            <VBox GridPane.columnIndex="1" GridPane.rowIndex="1" spacing="4"
+                    >
                 <GridPane.margin>
                     <Insets right="10.0" top="5.0" bottom="5.0"/>
                 </GridPane.margin>
@@ -121,8 +123,19 @@
             <InfoDisplay gridPane="$gridPane" onAction="#onOpenGeneralHelp" rowIndex="2"
                          text="%takeOffer.amountPriceBox.info"/>
 
+            <Label fx:id="isOfferAvailableLabel" text="%takeOffer.fundsBox.isOfferAvailable" GridPane.rowIndex="3">
+                <GridPane.margin>
+                    <Insets top="15.0"/>
+                </GridPane.margin>
+            </Label>
+            <ProgressIndicator fx:id="isOfferAvailableProgressIndicator" progress="-1" maxWidth="24" maxHeight="24"
+                               GridPane.rowIndex="3" GridPane.columnIndex="1" GridPane.halignment="LEFT">
+                <GridPane.margin>
+                    <Insets top="15.0"/>
+                </GridPane.margin>
+            </ProgressIndicator>
             <Button fx:id="showPaymentInfoScreenButton" text="%takeOffer.amountPriceBox.next" id="show-details-button"
-                    GridPane.columnIndex="1" GridPane.rowIndex="3" defaultButton="true"
+                    GridPane.columnIndex="1" GridPane.rowIndex="3" defaultButton="true" visible="false"
                     onAction="#onShowPayFundsScreen">
                 <GridPane.margin>
                     <Insets top="15.0"/>
diff --git a/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferView.java b/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferView.java
index d1f878242b..e9aae2b972 100644
--- a/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferView.java
+++ b/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferView.java
@@ -82,14 +82,13 @@ public class TakeOfferView extends ActivatableViewAndModel<AnchorPane, TakeOffer
     @FXML TextField priceTextField, volumeTextField, acceptedArbitratorsTextField, totalToPayTextField,
             bankAccountTypeTextField, bankAccountCurrencyTextField, bankAccountCountyTextField,
             acceptedCountriesTextField, acceptedLanguagesTextField;
-    @FXML Label buyLabel, addressLabel, amountRangeTextField, balanceLabel, totalToPayLabel, totalToPayInfoIconLabel,
+    @FXML Label isOfferAvailableLabel, buyLabel, addressLabel, amountRangeTextField, balanceLabel, totalToPayLabel,
+            totalToPayInfoIconLabel,
             bankAccountTypeLabel, bankAccountCurrencyLabel, bankAccountCountyLabel, acceptedCountriesLabel,
             acceptedLanguagesLabel, acceptedArbitratorsLabel, amountBtcLabel, priceDescriptionLabel,
             volumeDescriptionLabel, takeOfferSpinnerInfoLabel;
+    @FXML ProgressIndicator isOfferAvailableProgressIndicator;
 
-    private BooleanProperty tabIsClosable;
-    private boolean detailsVisible;
-    private boolean advancedScreenInited;
     private ImageView expand;
     private ImageView collapse;
     private PopOver totalToPayInfoPopover;
@@ -140,10 +139,26 @@ public class TakeOfferView extends ActivatableViewAndModel<AnchorPane, TakeOffer
         acceptedCountriesTextField.setText(model.getAcceptedCountries());
         acceptedLanguagesTextField.setText(model.getAcceptedLanguages());
         acceptedArbitratorsTextField.setText(model.getAcceptedArbitrators());
+
+        model.offerIsAvailable.addListener((ov, oldValue, newValue) -> {
+            isOfferAvailableLabel.setVisible(false);
+            isOfferAvailableLabel.setManaged(false);
+            isOfferAvailableProgressIndicator.setProgress(0);
+            isOfferAvailableProgressIndicator.setVisible(false);
+            isOfferAvailableProgressIndicator.setManaged(false);
+
+            if ((newValue == TakeOfferDataModel.OfferAvailableState.OFFER_AVAILABLE)) {
+                showPaymentInfoScreenButton.setVisible(true);
+            }
+            else if ((newValue == TakeOfferDataModel.OfferAvailableState.OFFER_NOT_AVAILABLE)) {
+                Popups.openWarningPopup("You cannot take that offer",
+                        "The offerer is either offline or the offer was already taken by another trader.");
+                close();
+            }
+        });
     }
 
     public void configCloseHandlers(BooleanProperty tabIsClosable) {
-        this.tabIsClosable = tabIsClosable;
         tabIsClosable.bind(model.tabIsClosable);
     }
 
@@ -206,8 +221,8 @@ public class TakeOfferView extends ActivatableViewAndModel<AnchorPane, TakeOffer
 
     @FXML
     void onToggleShowAdvancedSettings() {
-        detailsVisible = !detailsVisible;
-        if (detailsVisible) {
+        model.detailsVisible = !model.detailsVisible;
+        if (model.detailsVisible) {
             showAdvancedSettingsButton.setText(BSResources.get("takeOffer.fundsBox.hideAdvanced"));
             showAdvancedSettingsButton.setGraphic(collapse);
             showDetailsScreen();
@@ -236,7 +251,10 @@ public class TakeOfferView extends ActivatableViewAndModel<AnchorPane, TakeOffer
 
     private void close() {
         TabPane tabPane = ((TabPane) (root.getParent().getParent()));
-        tabPane.getTabs().remove(tabPane.getSelectionModel().getSelectedItem());
+
+        // Might fix #315  Offerbook tab gets closed 
+        //tabPane.getTabs().remove(tabPane.getSelectionModel().getSelectedItem());
+        tabPane.getTabs().remove(1);
     }
 
     private void setupListeners() {
@@ -329,7 +347,7 @@ public class TakeOfferView extends ActivatableViewAndModel<AnchorPane, TakeOffer
         scrollPane.setVbarPolicy(ScrollPane.ScrollBarPolicy.AS_NEEDED);
         scrollPane.layout();
 
-        advancedScreenInited = !advancedScreenInited;
+        model.advancedScreenInited = !model.advancedScreenInited;
 
         toggleDetailsScreen(true);
     }
diff --git a/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferViewModel.java b/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferViewModel.java
index d5b75db572..6e00298cc3 100644
--- a/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferViewModel.java
+++ b/src/main/java/io/bitsquare/gui/main/trade/takeoffer/TakeOfferViewModel.java
@@ -64,6 +64,8 @@ class TakeOfferViewModel extends ActivatableWithDelegate<TakeOfferDataModel> imp
     private final BSFormatter formatter;
     private final String offerFee;
     private final String networkFee;
+    boolean detailsVisible;
+    boolean advancedScreenInited;
 
     final StringProperty amount = new SimpleStringProperty();
     final StringProperty volume = new SimpleStringProperty();
@@ -80,6 +82,8 @@ class TakeOfferViewModel extends ActivatableWithDelegate<TakeOfferDataModel> imp
     final BooleanProperty showWarningInvalidBtcDecimalPlaces = new SimpleBooleanProperty();
     final BooleanProperty showTransactionPublishedScreen = new SimpleBooleanProperty();
     final BooleanProperty tabIsClosable = new SimpleBooleanProperty(true);
+    final ObjectProperty<TakeOfferDataModel.OfferAvailableState> offerIsAvailable =
+            new SimpleObjectProperty<>(TakeOfferDataModel.OfferAvailableState.UNKNOWN);
 
     final ObjectProperty<InputValidator.ValidationResult> amountValidationResult = new SimpleObjectProperty<>();
 
@@ -136,7 +140,6 @@ class TakeOfferViewModel extends ActivatableWithDelegate<TakeOfferDataModel> imp
         bankAccountCounty = BSResources.get(offer.getBankAccountCountry().getName());
     }
 
-
     void takeOffer() {
         delegate.requestTakeOfferErrorMessage.set(null);
         delegate.requestTakeOfferSuccess.set(false);
@@ -294,7 +297,8 @@ class TakeOfferViewModel extends ActivatableWithDelegate<TakeOfferDataModel> imp
                 delegate.volumeAsFiat));
         totalToPay.bind(createStringBinding(() -> formatter.formatCoinWithCode(delegate.totalToPayAsCoin.get()),
                 delegate.totalToPayAsCoin));
-        securityDeposit.bind(createStringBinding(() -> formatter.formatCoinWithCode(delegate.securityDepositAsCoin.get()),
+        securityDeposit.bind(createStringBinding(() -> formatter.formatCoinWithCode(delegate.securityDepositAsCoin
+                        .get()),
                 delegate.securityDepositAsCoin));
 
         totalToPayAsCoin.bind(delegate.totalToPayAsCoin);
@@ -302,6 +306,7 @@ class TakeOfferViewModel extends ActivatableWithDelegate<TakeOfferDataModel> imp
         requestTakeOfferErrorMessage.bind(delegate.requestTakeOfferErrorMessage);
         showTransactionPublishedScreen.bind(delegate.requestTakeOfferSuccess);
         transactionId.bind(delegate.transactionId);
+        offerIsAvailable.bind(delegate.offerIsAvailable);
 
         btcCode.bind(delegate.btcCode);
     }
diff --git a/src/main/java/io/bitsquare/trade/TradeManager.java b/src/main/java/io/bitsquare/trade/TradeManager.java
index 006501c61b..dd89ca4220 100644
--- a/src/main/java/io/bitsquare/trade/TradeManager.java
+++ b/src/main/java/io/bitsquare/trade/TradeManager.java
@@ -24,6 +24,7 @@ import io.bitsquare.btc.WalletService;
 import io.bitsquare.crypto.SignatureService;
 import io.bitsquare.msg.Message;
 import io.bitsquare.msg.MessageService;
+import io.bitsquare.msg.listeners.OutgoingMessageListener;
 import io.bitsquare.network.Peer;
 import io.bitsquare.offer.Direction;
 import io.bitsquare.offer.Offer;
@@ -37,10 +38,12 @@ import io.bitsquare.trade.protocol.trade.offerer.BuyerAcceptsOfferProtocolListen
 import io.bitsquare.trade.protocol.trade.offerer.messages.BankTransferInitedMessage;
 import io.bitsquare.trade.protocol.trade.offerer.messages.DepositTxPublishedMessage;
 import io.bitsquare.trade.protocol.trade.offerer.messages.RequestTakerDepositPaymentMessage;
+import io.bitsquare.trade.protocol.trade.offerer.messages.RespondToIsOfferAvailableMessage;
 import io.bitsquare.trade.protocol.trade.offerer.messages.RespondToTakeOfferRequestMessage;
 import io.bitsquare.trade.protocol.trade.taker.SellerTakesOfferProtocol;
 import io.bitsquare.trade.protocol.trade.taker.SellerTakesOfferProtocolListener;
 import io.bitsquare.trade.protocol.trade.taker.messages.PayoutTxPublishedMessage;
+import io.bitsquare.trade.protocol.trade.taker.messages.RequestIsOfferAvailableMessage;
 import io.bitsquare.trade.protocol.trade.taker.messages.RequestOffererPublishDepositTxMessage;
 import io.bitsquare.trade.protocol.trade.taker.messages.RequestTakeOfferMessage;
 import io.bitsquare.trade.protocol.trade.taker.messages.TakeOfferFeePayedMessage;
@@ -419,7 +422,25 @@ public class TradeManager {
 
         String tradeId = tradeMessage.getTradeId();
         if (tradeId != null) {
-            if (tradeMessage instanceof RequestTakeOfferMessage) {
+            if (tradeMessage instanceof RequestIsOfferAvailableMessage) {
+                // TODO Does not fit in any of the 2 protocols, but should not be here as well...
+                // Lets keep it until we refactor the trade process
+                boolean isOfferOpen = getTrade(tradeId) == null;
+                RespondToIsOfferAvailableMessage replyMessage =
+                        new RespondToIsOfferAvailableMessage(tradeId, isOfferOpen);
+                messageService.sendMessage(sender, replyMessage, new OutgoingMessageListener() {
+                    @Override
+                    public void onResult() {
+                        log.trace("RespondToTakeOfferRequestMessage successfully arrived at peer");
+                    }
+
+                    @Override
+                    public void onFailed() {
+                        log.error("AcceptTakeOfferRequestMessage  did not arrive at peer");
+                    }
+                });
+            }
+            else if (tradeMessage instanceof RequestTakeOfferMessage) {
                 createOffererAsBuyerProtocol(tradeId, sender);
             }
             else if (tradeMessage instanceof RespondToTakeOfferRequestMessage) {
diff --git a/src/main/java/io/bitsquare/trade/protocol/trade/offerer/messages/RespondToIsOfferAvailableMessage.java b/src/main/java/io/bitsquare/trade/protocol/trade/offerer/messages/RespondToIsOfferAvailableMessage.java
new file mode 100644
index 0000000000..3d46141d68
--- /dev/null
+++ b/src/main/java/io/bitsquare/trade/protocol/trade/offerer/messages/RespondToIsOfferAvailableMessage.java
@@ -0,0 +1,42 @@
+/*
+ * This file is part of Bitsquare.
+ *
+ * Bitsquare is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * Bitsquare 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 Affero General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Bitsquare. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.bitsquare.trade.protocol.trade.offerer.messages;
+
+import io.bitsquare.trade.protocol.trade.TradeMessage;
+
+import java.io.Serializable;
+
+public class RespondToIsOfferAvailableMessage implements Serializable, TradeMessage {
+    private static final long serialVersionUID = 6177387534187739018L;
+    private final String tradeId;
+    private final boolean isOfferOpen;
+
+    public RespondToIsOfferAvailableMessage(String tradeId, boolean isOfferOpen) {
+        this.tradeId = tradeId;
+        this.isOfferOpen = isOfferOpen;
+    }
+
+    @Override
+    public String getTradeId() {
+        return tradeId;
+    }
+
+    public boolean isOfferOpen() {
+        return isOfferOpen;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/io/bitsquare/trade/protocol/trade/offerer/tasks/HandleTakeOfferRequest.java b/src/main/java/io/bitsquare/trade/protocol/trade/offerer/tasks/HandleTakeOfferRequest.java
index e5da589592..9c56602e9d 100644
--- a/src/main/java/io/bitsquare/trade/protocol/trade/offerer/tasks/HandleTakeOfferRequest.java
+++ b/src/main/java/io/bitsquare/trade/protocol/trade/offerer/tasks/HandleTakeOfferRequest.java
@@ -33,17 +33,17 @@ public class HandleTakeOfferRequest {
     public static void run(ResultHandler resultHandler, ExceptionHandler exceptionHandler, Peer peer,
                            MessageService messageService, Trade.State tradeState, String tradeId) {
         log.trace("Run task");
-        boolean takeOfferRequestAccepted = tradeState == Trade.State.OPEN;
-        if (!takeOfferRequestAccepted) {
+        boolean isTradeIsOpen = tradeState == Trade.State.OPEN;
+        if (!isTradeIsOpen) {
             log.warn("Received take offer request but the offer not marked as open anymore.");
         }
         RespondToTakeOfferRequestMessage tradeMessage =
-                new RespondToTakeOfferRequestMessage(tradeId, takeOfferRequestAccepted);
+                new RespondToTakeOfferRequestMessage(tradeId, isTradeIsOpen);
         messageService.sendMessage(peer, tradeMessage, new OutgoingMessageListener() {
             @Override
             public void onResult() {
                 log.trace("RespondToTakeOfferRequestMessage successfully arrived at peer");
-                resultHandler.onResult(takeOfferRequestAccepted);
+                resultHandler.onResult(isTradeIsOpen);
             }
 
             @Override
diff --git a/src/main/java/io/bitsquare/trade/protocol/trade/taker/messages/RequestIsOfferAvailableMessage.java b/src/main/java/io/bitsquare/trade/protocol/trade/taker/messages/RequestIsOfferAvailableMessage.java
new file mode 100644
index 0000000000..6740195035
--- /dev/null
+++ b/src/main/java/io/bitsquare/trade/protocol/trade/taker/messages/RequestIsOfferAvailableMessage.java
@@ -0,0 +1,39 @@
+/*
+ * This file is part of Bitsquare.
+ *
+ * Bitsquare is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * Bitsquare 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 Affero General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Bitsquare. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.bitsquare.trade.protocol.trade.taker.messages;
+
+import io.bitsquare.trade.protocol.trade.TradeMessage;
+
+import java.io.Serializable;
+
+// That msg is used to ping the offerer if he is online and if the offer is still available
+public class RequestIsOfferAvailableMessage implements Serializable, TradeMessage {
+    private static final long serialVersionUID = 4630151440192191798L;
+    private final String tradeId;
+
+    public RequestIsOfferAvailableMessage(String tradeId) {
+        this.tradeId = tradeId;
+    }
+
+    @Override
+    public String getTradeId() {
+        return tradeId;
+    }
+
+
+}
diff --git a/src/main/resources/i18n/displayStrings.properties b/src/main/resources/i18n/displayStrings.properties
index 1cf5949f3d..472edfe0cc 100644
--- a/src/main/resources/i18n/displayStrings.properties
+++ b/src/main/resources/i18n/displayStrings.properties
@@ -96,6 +96,7 @@ takeOffer.validation.amountSmallerThanMinAmount=Amount cannot be smaller than mi
 takeOffer.validation.amountLargerThanOfferAmount=Input amount cannot be higher than the amount defined in the offer.
 
 takeOffer.fundsBox.title=Fund your trade wallet
+takeOffer.fundsBox.isOfferAvailable=Check if offer is available:
 takeOffer.fundsBox.totalsNeeded=Funds needed for that trade:
 takeOffer.fundsBox.totalsNeeded.prompt=Will be calculated from the Bitcoin amount entered above
 takeOffer.fundsBox.address=Trade wallet address: