[#32] Provide a pool of clients to grpc

Signed-off-by: Ori Bruk <o.bruk@yadro.com>

exceptions/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>info.frostfs.sdk</groupId>
         <artifactId>frostfs-sdk-java</artifactId>
-        <version>0.1.0</version>
+        <version>0.2.0</version>
     </parent>
 
     <artifactId>exceptions</artifactId>

exceptions/src/main/java/info/frostfs/sdk/constants/ErrorConst.java

@@ -40,6 +40,11 @@ public class ErrorConst {
 
     public static final String WRONG_UUID_SIZE_TEMPLATE = "uuid byte array length must be %s";
 
+    public static final String POOL_CLIENT_UNHEALTHY = "pool client unhealthy";
+    public static final String POOL_PEERS_IS_MISSING = "no FrostFS peers configured";
+    public static final String POOL_NODES_UNHEALTHY = "at least one node must be healthy";
+    public static final String POOL_CLIENTS_UNHEALTHY = "cannot find alive client";
+    public static final String POOL_NOT_DIALED = "pool not dialed";
 
     public static final String FIELDS_DELIMITER_COMMA = ", ";
     public static final String FIELDS_DELIMITER_OR = " or ";

exceptions/src/main/java/info/frostfs/sdk/exceptions/FrostFSException.java

@@ -0,0 +1,15 @@
+package info.frostfs.sdk.exceptions;
+
+public class FrostFSException extends RuntimeException {
+
+    public FrostFSException() {
+    }
+
+    public FrostFSException(String message) {
+        super(message);
+    }
+
+    public FrostFSException(Throwable cause) {
+        super(cause);
+    }
+}

exceptions/src/main/java/info/frostfs/sdk/exceptions/ProcessFrostFSException.java

@@ -1,6 +1,6 @@
 package info.frostfs.sdk.exceptions;
 
-public class ProcessFrostFSException extends RuntimeException {
+public class ProcessFrostFSException extends FrostFSException {
     public ProcessFrostFSException(String message) {
         super(message);
     }

exceptions/src/main/java/info/frostfs/sdk/exceptions/SessionExpiredFrostFSException.java

@@ -0,0 +1,8 @@
+package info.frostfs.sdk.exceptions;
+
+public class SessionExpiredFrostFSException extends FrostFSException {
+
+    public SessionExpiredFrostFSException(String message) {
+        super(message);
+    }
+}

exceptions/src/main/java/info/frostfs/sdk/exceptions/SessionNotFoundFrostFSException.java

@@ -0,0 +1,8 @@
+package info.frostfs.sdk.exceptions;
+
+public class SessionNotFoundFrostFSException extends FrostFSException {
+
+    public SessionNotFoundFrostFSException(String message) {
+        super(message);
+    }
+}

exceptions/src/main/java/info/frostfs/sdk/exceptions/TimeoutFrostFSException.java

@@ -1,6 +1,6 @@
 package info.frostfs.sdk.exceptions;
 
-public class TimeoutFrostFSException extends RuntimeException {
+public class TimeoutFrostFSException extends FrostFSException {
     public TimeoutFrostFSException() {
     }
 }

exceptions/src/main/java/info/frostfs/sdk/exceptions/ValidationFrostFSException.java

@@ -1,6 +1,6 @@
 package info.frostfs.sdk.exceptions;
 
-public class ValidationFrostFSException extends RuntimeException {
+public class ValidationFrostFSException extends FrostFSException {
     public ValidationFrostFSException(String message) {
         super(message);
     }