Refactor WebSocket support to use Redis for pubsub communication.

src/main/java/org/whispersystems/textsecuregcm/websocket/InvalidWebsocketAddressException.java

@@ -0,0 +1,11 @@
+package org.whispersystems.textsecuregcm.websocket;
+
+public class InvalidWebsocketAddressException extends Exception {
+  public InvalidWebsocketAddressException(String serialized) {
+    super(serialized);
+  }
+
+  public InvalidWebsocketAddressException(Exception e) {
+    super(e);
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/websocket/WebsocketAddress.java

@@ -0,0 +1,57 @@
+package org.whispersystems.textsecuregcm.websocket;
+
+public class WebsocketAddress {
+
+  private final long accountId;
+  private final long deviceId;
+
+  public WebsocketAddress(String serialized) throws InvalidWebsocketAddressException {
+    try {
+      String[] parts = serialized.split(":");
+
+      if (parts == null || parts.length != 2) {
+        throw new InvalidWebsocketAddressException(serialized);
+      }
+
+      this.accountId = Long.parseLong(parts[0]);
+      this.deviceId  = Long.parseLong(parts[1]);
+    } catch (NumberFormatException e) {
+      throw new InvalidWebsocketAddressException(e);
+    }
+  }
+
+  public WebsocketAddress(long accountId, long deviceId) {
+    this.accountId = accountId;
+    this.deviceId  = deviceId;
+  }
+
+  public long getAccountId() {
+    return accountId;
+  }
+
+  public long getDeviceId() {
+    return deviceId;
+  }
+
+  public String toString() {
+    return accountId + ":" + deviceId;
+  }
+
+  @Override
+  public boolean equals(Object other) {
+    if (other == null) return false;
+    if (!(other instanceof WebsocketAddress)) return false;
+
+    WebsocketAddress that = (WebsocketAddress)other;
+
+    return
+        this.accountId == that.accountId &&
+        this.deviceId == that.deviceId;
+  }
+
+  @Override
+  public int hashCode() {
+    return (int)accountId ^ (int)deviceId;
+  }
+
+}

src/main/java/org/whispersystems/textsecuregcm/websocket/WebsocketMessage.java

@@ -0,0 +1,18 @@
+package org.whispersystems.textsecuregcm.websocket;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class WebsocketMessage {
+
+  @JsonProperty
+  private long id;
+
+  @JsonProperty
+  private String message;
+
+  public WebsocketMessage(long id, String message) {
+    this.id      = id;
+    this.message = message;
+  }
+
+}